// Copyright (C) 2002-2009 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#ifndef __I_SCENE_MANAGER_H_INCLUDED__
#define __I_SCENE_MANAGER_H_INCLUDED__

#include "IReferenceCounted.h"
#include "irrArray.h"
#include "irrString.h"
#include "vector3d.h"
#include "dimension2d.h"
#include "SColor.h"
#include "ETerrainElements.h"
#include "ESceneNodeTypes.h"
#include "ESceneNodeAnimatorTypes.h"
#include "EMeshWriterEnums.h"
#include "SceneParameters.h"
#include "IGeometryCreator.h"

namespace irr
{
	struct SKeyMap;
	struct SEvent;

namespace io
{
	class IReadFile;
	class IAttributes;
	class IWriteFile;
	class IFileSystem;
} // end namespace io

namespace gui
{
	class IGUIFont;
	class IGUIEnvironment;
} // end namespace gui

namespace video
{
	class IVideoDriver;
	class SMaterial;
	class IImage;
	class ITexture;
} // end namespace video

namespace scene
{
	class IMeshWriter;

	//! Enumeration for render passes.
	/** A parameter passed to the registerNodeForRendering() method of the ISceneManager,
	specifying when the node wants to be drawn in relation to the other nodes. */
	enum E_SCENE_NODE_RENDER_PASS
	{
		//! No pass currently active
		ESNRP_NONE =0,

		//! Camera pass. The active view is set up here. The very first pass.
		ESNRP_CAMERA =1,

		//! In this pass, lights are transformed into camera space and added to the driver
		ESNRP_LIGHT =2,

		//! This is used for sky boxes.
		ESNRP_SKY_BOX =4,

		//! All normal objects can use this for registering themselves.
		/** This value will never be returned by
		ISceneManager::getSceneNodeRenderPass(). The scene manager
		will determine by itself if an object is transparent or solid
		and register the object as SNRT_TRANSPARENT or SNRT_SOLD
		automatically if you call registerNodeForRendering with this
		value (which is default). Note that it will register the node
		only as ONE type. If your scene node has both solid and
		transparent material types register it twice (one time as
		SNRT_SOLID, the other time as SNRT_TRANSPARENT) and in the
		render() method call getSceneNodeRenderPass() to find out the
		current render pass and render only the corresponding parts of
		the node. */
		ESNRP_AUTOMATIC =24,

		//! Solid scene nodes or special scene nodes without materials.
		ESNRP_SOLID =8,

		//! Transparent scene nodes, drawn after solid nodes. They are sorted from back to front and drawn in that order.
		ESNRP_TRANSPARENT =16,

		//! Transparent effect scene nodes, drawn after Transparent nodes. They are sorted from back to front and drawn in that order.
		ESNRP_TRANSPARENT_EFFECT =32,

		//! Drawn after the transparent nodes, the time for drawing shadow volumes
		ESNRP_SHADOW =64
	};

	class IMesh;
	class IMeshBuffer;
	class IAnimatedMesh;
	class IMeshCache;
	class ISceneNode;
	class ICameraSceneNode;
	class IAnimatedMeshSceneNode;
	class ISceneNodeAnimator;
	class ISceneNodeAnimatorCollisionResponse;
	class ILightSceneNode;
	class IBillboardSceneNode;
	class ITerrainSceneNode;
	class IMeshSceneNode;
	class IMeshLoader;
	class ISceneCollisionManager;
	class IParticleSystemSceneNode;
	class IDummyTransformationSceneNode;
	class ITriangleSelector;
	class IMetaTriangleSelector;
	class IMeshManipulator;
	class ITextSceneNode;
	class IBillboardTextSceneNode;
	class IVolumeLightSceneNode;
	class ISceneNodeFactory;
	class ISceneNodeAnimatorFactory;
	class ISceneUserDataSerializer;
	class ILightManager;

	namespace quake3
	{
		struct IShader;
	} // end namespace quake3

	//! The Scene Manager manages scene nodes, mesh recources, cameras and all the other stuff.
	/** All Scene nodes can be created only here. There is a always growing
	list of scene nodes for lots of purposes: Indoor rendering scene nodes
	like the Octree (addOctTreeSceneNode()) or the terrain renderer
	(addTerrainSceneNode()), different Camera scene nodes
	(addCameraSceneNode(), addCameraSceneNodeMaya()), scene nodes for Light
	(addLightSceneNode()), Billboards (addBillboardSceneNode()) and so on.
	A scene node is a node in the hierachical scene graph. Every scene node
	may have children, which are other scene nodes. Children move relative
	the their parents position. If the parent of a node is not visible, its
	children won't be visible, too. In this way, it is for example easily
	possible to attach a light to a moving car or to place a walking
	character on a moving platform on a moving ship.
	The SceneManager is also able to load 3d mesh files of different
	formats. Take a look at getMesh() to find out what formats are
	supported. And if these formats are not enough use
	addExternalMeshLoader() to add new formats to the engine.
	*/
	class ISceneManager : public virtual IReferenceCounted
	{
	public:

		//! Destructor
		virtual ~ISceneManager() {}

		//! Get pointer to an animateable mesh. Loads the file if not loaded already.
		/**
		 * If you want to remove a loaded mesh from the cache again, use removeMesh().
		 *  Currently there are the following mesh formats supported:
		 *  <TABLE border="1" cellpadding="2" cellspacing="0">
		 *  <TR>
		 *    <TD>Format</TD>
		 *    <TD>Description</TD>
		 *  </TR>
		 *  <TR>
		 *    <TD>3D Studio (.3ds)</TD>
		 *    <TD>Loader for 3D-Studio files which lots of 3D packages
		 *      are able to export.  Only static meshes are currently
		 *      supported by this importer. </TD>
		 *  </TR>
		 *  <TR>
		 *    <TD>Bliz Basic B3D (.b3d)</TD>
		 *    <TD>Loader for blitz basic files, developed by Mark
		 *      Sibly, also supports animations.</TD>
		 *  </TR>
		 *  <TR>
		 *    <TD>Cartography shop 4 (.csm)</TD>
		 *    <TD>Cartography Shop is a modeling program for creating
		 *      architecture and calculating lighting. Irrlicht can
		 *      directly import .csm files thanks to the IrrCSM library
		 *      created by Saurav Mohapatra which is now integrated
		 *      directly in Irrlicht.  If you are using this loader,
		 *      please note that you'll have to set the path of the
		 *      textures before loading .csm files. You can do this
		 *      using
		 *      SceneManager-&gt;getParameters()-&gt;setAttribute(scene::CSM_TEXTURE_PATH,
		 *      &quot;path/to/your/textures&quot;);</TD>
		 *  </TR>
		 *  <TR>
		 *    <TD>COLLADA (.dae, .xml)</TD>
		 *    <TD>COLLADA is an open Digital Asset Exchange Schema for
		 *        the interactive 3D industry.  There are exporters and
		 *        importers for this format available for most of the
		 *        big 3d packagesat http://collada.org. Irrlicht can
		 *        import COLLADA files by using the
		 *        ISceneManager::getMesh() method. COLLADA files need
		 *        not contain only one single mesh but multiple meshes
		 *        and a whole scene setup with lights, cameras and mesh
		 *        instances, this loader can set up a scene as
		 *        described by the COLLADA file instead of loading and
		 *        returning one single mesh. By default, this loader
		 *        behaves like the other loaders and does not create
		 *        instances, but it can be switched into this mode by
		 *        using
		 *        SceneManager->getParameters()->setAttribute(COLLADA_CREATE_SCENE_INSTANCES, true);
		 *        Created scene nodes will be named as the names of the
		 *        nodes in the COLLADA file. The returned mesh is just
		 *        a dummy object in this mode. Meshes included in the
		 *        scene will be added into the scene manager with the
		 *        following naming scheme:
		 *        path/to/file/file.dea#meshname. The loading of such
		 *        meshes is logged.  Currently, this loader is able to
		 *        create meshes (made of only polygons), lights, and
		 *        cameras. Materials and animations are currently not
		 *        supported but this will change with future releases.
		 *    </TD>
		 *  </TR>
		 *  <TR>
		 *    <TD>Delgine DeleD (.dmf)</TD>
		 *    <TD>DeleD (delgine.com) is a 3D editor and level-editor
		 *        combined into one and is specifically designed for 3D
		 *        game-development. With this loader, it is possible to
		 *        directly load all geometry is as well as textures and
		 *        lightmaps from .dmf files.  To set texture and
		 *        material paths, see scene::DMF_USE_MATERIALS_DIRS and
		 *        scene::DMF_TEXTURE_PATH. It is also possible to flip
		 *        the alpha texture by setting
		 *        scene::DMF_FLIP_ALPHA_TEXTURES to true and to set the
		 *        material transparent reference value by setting
		 *        scene::DMF_ALPHA_CHANNEL_REF to a float between 0 and
		 *        1. The loader is based on Salvatore Russo's .dmf
		 *        loader, I just changed some parts of it. Thanks to
		 *        Salvatore for his work and for allowing me to use his
		 *        code in Irrlicht and put it under Irrlicht's license.
		 *        For newer and more enchanced versions of the loader,
		 *        take a look at delgine.com.
		 *    </TD>
		 *  </TR>
		 *  <TR>
		 *    <TD>DirectX (.x)</TD>
		 *    <TD>Platform independent importer (so not D3D-only) for
		 *      .x files. Most 3D packages can export these natively
		 *      and there are several tools for them available, e.g.
		 *      the Maya exporter included in the DX SDK.
		 *      .x files can include skeletal animations and Irrlicht
		 *      is able to play and display them.  Currently, Irrlicht
		 *      only supports uncompressed .x files.</TD>
		 *  </TR>
		 *  <TR>
		 *    <TD>Maya (.obj)</TD>
		 *    <TD>Most 3D software can create .obj files which contain
		 *      static geometry without material data. The material
		 *      files .mtl are also supported. This importer for
		 *      Irrlicht can load them directly. </TD>
		 *  </TR>
		 *  <TR>
		 *    <TD>Milkshape (.ms3d)</TD>
		 *    <TD>.MS3D files contain models and sometimes skeletal
		 *      animations from the Milkshape 3D modeling and animation
		 *      software. This importer for Irrlicht can display and/or
		 *      animate these files.  </TD>
		 *  </TR>
		 *  <TR>
		 *  <TD>My3D (.my3d)</TD>
		 *      <TD>.my3D is a flexible 3D file format. The My3DTools
		 *        contains plug-ins to export .my3D files from several
		 *        3D packages. With this built-in importer, Irrlicht
		 *        can read and display those files directly. This
		 *        loader was written by Zhuck Dimitry who also created
		 *        the whole My3DTools package. If you are using this
		 *        loader, please note that you can set the path of the
		 *        textures before loading .my3d files.  You can do this
		 *        using
		 *        SceneManager-&gt;getParameters()-&gt;setAttribute(scene::MY3D_TEXTURE_PATH,
		 *        &quot;path/to/your/textures&quot;);
		 *        </TD>
		 *    </TR>
		 *    <TR>
		 *      <TD>OCT (.oct)</TD>
		 *      <TD>The oct file format contains 3D geometry and
		 *        lightmaps and can be loaded directly by Irrlicht. OCT
		 *        files<br> can be created by FSRad, Paul Nette's
		 *        radiosity processor or exported from Blender using
		 *        OCTTools which can be found in the exporters/OCTTools
		 *        directory of the SDK. Thanks to Murphy McCauley for
		 *        creating all this.</TD>
		 *    </TR>
		 *    <TR>
		 *      <TD>OGRE Meshes (.mesh)</TD>
		 *      <TD>Ogre .mesh files contain 3D data for the OGRE 3D
		 *        engine. Irrlicht can read and display them directly
		 *        with this importer. To define materials for the mesh,
		 *        copy a .material file named like the corresponding
		 *        .mesh file where the .mesh file is. (For example
		 *        ogrehead.material for ogrehead.mesh). Thanks to
		 *        Christian Stehno who wrote and contributed this
		 *        loader.</TD>
		 *    </TR>
		 *    <TR>
		 *      <TD>Pulsar LMTools (.lmts)</TD>
		 *      <TD>LMTools is a set of tools (Windows &amp; Linux) for
		 *        creating lightmaps.  Irrlicht can directly read .lmts
		 *        files thanks to<br> the importer created by Jonas
		 *        Petersen. If you are using this loader, please note
		 *        that you can set the path of the textures before
		 *        loading .lmts files.  You can do this using
		 *        SceneManager-&gt;getParameters()-&gt;setAttribute(scene::LMTS_TEXTURE_PATH,
		 *        &quot;path/to/your/textures&quot;);
		 *        Notes for<br> this version of the loader:<br>
		 *        - It does not recognise/support user data in the
		 *          *.lmts files.<br>
		 *        - The TGAs generated by LMTools don't work in
		 *          Irrlicht for some reason (the textures are upside
		 *          down). Opening and resaving them in a graphics app
		 *          will solve the problem.</TD>
		 *    </TR>
		 *    <TR>
		 *      <TD>Quake 3 levels (.bsp)</TD>
		 *      <TD>Quake 3 is a popular game by IDSoftware, and .pk3
		 *        files contain .bsp files and textures/lightmaps
		 *        describing huge prelighted levels. Irrlicht can read
		 *        .pk3 and .bsp files directly and thus render Quake 3
		 *        levels directly. Written by Nikolaus Gebhardt
		 *        enhanced by Dean P. Macri with the curved surfaces
		 *        feature. </TD>
		 *    </TR>
		 *    <TR>
		 *      <TD>Quake 2 models (.md2)</TD>
		 *      <TD>Quake 2 models are characters with morph target
		 *        animation. Irrlicht can read, display and animate
		 *        them directly with this importer. </TD>
		 *    </TR>
		 *  </TABLE>
		 *
		 *  To load and display a mesh quickly, just do this:
		 *  \code
		 *  SceneManager->addAnimatedMeshSceneNode(
		 *		SceneManager->getMesh("yourmesh.3ds"));
		 * \endcode
		 * If you would like to implement and add your own file format loader to Irrlicht,
		 * see addExternalMeshLoader().
		 * \param filename: Filename of the mesh to load.
		 * \return Null if failed, otherwise pointer to the mesh.
		 * This pointer should not be dropped. See IReferenceCounted::drop() for more information.
		 **/
		virtual IAnimatedMesh* getMesh(const core::string<c16>& filename) = 0;

		//! Get pointer to an animateable mesh. Loads the file if not loaded already.
		/** Works just as getMesh(const char* filename). If you want to
		remove a loaded mesh from the cache again, use removeMesh().
		\param file File handle of the mesh to load.
		\return NULL if failed and pointer to the mesh if successful.
		This pointer should not be dropped. See
		IReferenceCounted::drop() for more information. */
		virtual IAnimatedMesh* getMesh(io::IReadFile* file) = 0;

		//! Get interface to the mesh cache which is shared beween all existing scene managers.
		/** With this interface, it is possible to manually add new loaded
		meshes (if ISceneManager::getMesh() is not sufficient), to remove them and to iterate
		through already loaded meshes. */
		virtual IMeshCache* getMeshCache() = 0;

		//! Get the video driver.
		/** \return Pointer to the video Driver.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual video::IVideoDriver* getVideoDriver() = 0;

		//! Get the active GUIEnvironment
		/** \return Pointer to the GUIEnvironment
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual gui::IGUIEnvironment* getGUIEnvironment() = 0;

		//! Get the active FileSystem
		/** \return Pointer to the FileSystem
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual io::IFileSystem* getFileSystem() = 0;

		//! adds Volume Lighting Scene Node.
		/** Example Usage:
			scene::IVolumeLightSceneNode * n = smgr->addVolumeLightSceneNode(NULL, -1,
						32, 32, //Subdivide U/V
						video::SColor(0, 180, 180, 180),   //foot color
						video::SColor(0, 0, 0, 0)         //tail color
						);
			if (n)
			{
				n->setScale(core::vector3df(46.0f, 45.0f, 46.0f));
				n->getMaterial(0).setTexture(0, smgr->getVideoDriver()->getTexture("lightFalloff.png"));
			}
		\return Pointer to the volumeLight if successful, otherwise NULL.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IVolumeLightSceneNode* addVolumeLightSceneNode(ISceneNode* parent=0, s32 id=-1,
			const u32 subdivU = 32, const u32 subdivV = 32,
			const video::SColor foot = video::SColor(51, 0, 230, 180),
			const video::SColor tail = video::SColor(0, 0, 0, 0),
			const core::vector3df& position = core::vector3df(0,0,0),
			const core::vector3df& rotation = core::vector3df(0,0,0),
			const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f)) = 0;


		//! Adds a test scene node for test purposes to the scene.
		/** It is a simple cube of (1,1,1) size.
		\param size: Size of the cube.
		\param parent: Parent of the scene node. Can be NULL if no parent.
		\param id: Id of the node. This id can be used to identify the scene node.
		\param position: Position of the space relative to its parent where the
		scene node will be placed.
		\param rotation: Initital rotation of the scene node.
		\param scale: Initial scale of the scene node.
		\return Pointer to the created test scene node. This
		pointer should not be dropped. See IReferenceCounted::drop()
		for more information. */
		virtual IMeshSceneNode* addCubeSceneNode(f32 size=10.0f, ISceneNode* parent=0, s32 id=-1,
			const core::vector3df& position = core::vector3df(0,0,0),
			const core::vector3df& rotation = core::vector3df(0,0,0),
			const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f)) = 0;

		//! Adds a sphere scene node for test purposes to the scene.
		/** It is a simple sphere.
		\param radius: Radius of the sphere.
		\param polyCount: Polycount of the sphere.
		\param parent: Parent of the scene node. Can be NULL if no parent.
		\param id: Id of the node. This id can be used to identify the scene node.
		\param position: Position of the space relative to its parent where the
		scene node will be placed.
		\param rotation: Initital rotation of the scene node.
		\param scale: Initial scale of the scene node.
		\return Pointer to the created test scene node. This
		pointer should not be dropped. See IReferenceCounted::drop()
		for more information. */
		virtual IMeshSceneNode* addSphereSceneNode(f32 radius=5.0f, s32 polyCount=16,
				ISceneNode* parent=0, s32 id=-1,
				const core::vector3df& position = core::vector3df(0,0,0),
				const core::vector3df& rotation = core::vector3df(0,0,0),
				const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f)) = 0;

		//! Adds a scene node for rendering an animated mesh model.
		/** \param mesh: Pointer to the loaded animated mesh to be displayed.
		\param parent: Parent of the scene node. Can be NULL if no parent.
		\param id: Id of the node. This id can be used to identify the scene node.
		\param position: Position of the space relative to its parent where the
		scene node will be placed.
		\param rotation: Initital rotation of the scene node.
		\param scale: Initial scale of the scene node.
		\param alsoAddIfMeshPointerZero: Add the scene node even if a 0 pointer is passed.
		\return Pointer to the created scene node.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IAnimatedMeshSceneNode* addAnimatedMeshSceneNode(IAnimatedMesh* mesh,
				ISceneNode* parent=0, s32 id=-1,
				const core::vector3df& position = core::vector3df(0,0,0),
				const core::vector3df& rotation = core::vector3df(0,0,0),
				const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f),
				bool alsoAddIfMeshPointerZero=false) = 0;

		//! Adds a scene node for rendering a static mesh.
		/** \param mesh: Pointer to the loaded static mesh to be displayed.
		\param parent: Parent of the scene node. Can be NULL if no parent.
		\param id: Id of the node. This id can be used to identify the scene node.
		\param position: Position of the space relative to its parent where the
		scene node will be placed.
		\param rotation: Initital rotation of the scene node.
		\param scale: Initial scale of the scene node.
		\param alsoAddIfMeshPointerZero: Add the scene node even if a 0 pointer is passed.
		\return Pointer to the created scene node.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IMeshSceneNode* addMeshSceneNode(IMesh* mesh, ISceneNode* parent=0, s32 id=-1,
			const core::vector3df& position = core::vector3df(0,0,0),
			const core::vector3df& rotation = core::vector3df(0,0,0),
			const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f),
			bool alsoAddIfMeshPointerZero=false) = 0;

		//! Adds a scene node for rendering a animated water surface mesh.
		/** Looks really good when the Material type EMT_TRANSPARENT_REFLECTION
		is used.
		\param waveHeight: Height of the water waves.
		\param waveSpeed: Speed of the water waves.
		\param waveLength: Lenght of a water wave.
		\param mesh: Pointer to the loaded static mesh to be displayed with water waves on it.
		\param parent: Parent of the scene node. Can be NULL if no parent.
		\param id: Id of the node. This id can be used to identify the scene node.
		\param position: Position of the space relative to its parent where the
		scene node will be placed.
		\param rotation: Initital rotation of the scene node.
		\param scale: Initial scale of the scene node.
		\return Pointer to the created scene node.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNode* addWaterSurfaceSceneNode(IMesh* mesh,
			f32 waveHeight=2.0f, f32 waveSpeed=300.0f, f32 waveLength=10.0f,
			ISceneNode* parent=0, s32 id=-1,
			const core::vector3df& position = core::vector3df(0,0,0),
			const core::vector3df& rotation = core::vector3df(0,0,0),
			const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f)) = 0;


		//! Adds a scene node for rendering using a octtree to the scene graph.
		/** This a good method for rendering
		scenes with lots of geometry. The Octree is built on the fly from the mesh.
		\param mesh: The mesh containing all geometry from which the octtree will be build.
		If this animated mesh has more than one frames in it, the first frame is taken.
		\param parent: Parent node of the octtree node.
		\param id: id of the node. This id can be used to identify the node.
		\param minimalPolysPerNode: Specifies the minimal polygons contained a octree node.
		If a node gets less polys than this value it will not be split into
		smaller nodes.
		\param alsoAddIfMeshPointerZero: Add the scene node even if a 0 pointer is passed.
		\return Pointer to the OctTree if successful, otherwise 0.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IMeshSceneNode* addOctTreeSceneNode(IAnimatedMesh* mesh, ISceneNode* parent=0,
			s32 id=-1, s32 minimalPolysPerNode=512, bool alsoAddIfMeshPointerZero=false) = 0;

		//! Adds a scene node for rendering using a octtree to the scene graph.
		/** This a good method for rendering scenes with lots of
		geometry. The Octree is built on the fly from the mesh, much
		faster then a bsp tree.
		\param mesh: The mesh containing all geometry from which the octtree will be build.
		\param parent: Parent node of the octtree node.
		\param id: id of the node. This id can be used to identify the node.
		\param minimalPolysPerNode: Specifies the minimal polygons contained a octree node.
		If a node gets less polys than this value it will not be split into
		smaller nodes.
		\param alsoAddIfMeshPointerZero: Add the scene node even if a 0 pointer is passed.
		\return Pointer to the octtree if successful, otherwise 0.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IMeshSceneNode* addOctTreeSceneNode(IMesh* mesh, ISceneNode* parent=0,
			s32 id=-1, s32 minimalPolysPerNode=256, bool alsoAddIfMeshPointerZero=false) = 0;

		//! Adds a camera scene node to the scene graph and sets it as active camera.
		/** This camera does not react on user input like for example the one created with
		addCameraSceneNodeFPS(). If you want to move or animate it, use animators or the
		ISceneNode::setPosition(), ICameraSceneNode::setTarget() etc methods.
		By default, a camera's look at position (set with setTarget()) and its scene node
		rotation (set with setRotation()) are independent. If you want to be able to
		control the direction that the camera looks by using setRotation() then call
		ICameraSceneNode::bindTargetAndRotation(true) on it.
		\param position: Position of the space relative to its parent where the camera will be placed.
		\param lookat: Position where the camera will look at. Also known as target.
		\param parent: Parent scene node of the camera. Can be null. If the parent moves,
		the camera will move too.
		\param id: id of the camera. This id can be used to identify the camera.
		\return Pointer to interface to camera if successful, otherwise 0.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ICameraSceneNode* addCameraSceneNode(ISceneNode* parent = 0,
			const core::vector3df& position = core::vector3df(0,0,0),
			const core::vector3df& lookat = core::vector3df(0,0,100), s32 id=-1) = 0;

		//! Adds a maya style user controlled camera scene node to the scene graph.
		/** This is a standard camera with an animator that provides mouse control similar
		 to camera in the 3D Software Maya by Alias Wavefront.
		 \param parent: Parent scene node of the camera. Can be null.
		 \param rotateSpeed: Rotation speed of the camera.
		 \param zoomSpeed: Zoom speed of the camera.
		 \param translationSpeed: TranslationSpeed of the camera.
		 \param id: id of the camera. This id can be used to identify the camera.
		 \return Returns a pointer to the interface of the camera if successful, otherwise 0.
		 This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ICameraSceneNode* addCameraSceneNodeMaya(ISceneNode* parent = 0,
			f32 rotateSpeed = -1500.0f, f32 zoomSpeed = 200.0f,
			f32 translationSpeed = 1500.0f, s32 id=-1) = 0;

		//! Adds a camera scene node with an animator which provides mouse and keyboard control appropriate for first person shooters (FPS).
		/** This FPS camera is intended to provide a demonstration of a camera that behaves
		 like a typical First Person Shooter.  It is useful for simple demos and prototyping but is not 
		 intended to provide a full solution for a production quality game. It binds the camera scene node 
		 rotation to the look-at target; @see ICameraSceneNode::bindTargetAndRotation().
		 With this camera, you look with the mouse, and move with cursor keys. If you want to 
		 change the key layout, you can specify your own keymap. For example to make the camera
		 be controlled by the cursor keys AND the keys W,A,S, and D, do something
		 like this:
		 \code
		 SKeyMap keyMap[8];
		 keyMap[0].Action = EKA_MOVE_FORWARD;
		 keyMap[0].KeyCode = KEY_UP;
		 keyMap[1].Action = EKA_MOVE_FORWARD;
		 keyMap[1].KeyCode = KEY_KEY_W;

		 keyMap[2].Action = EKA_MOVE_BACKWARD;
		 keyMap[2].KeyCode = KEY_DOWN;
		 keyMap[3].Action = EKA_MOVE_BACKWARD;
		 keyMap[3].KeyCode = KEY_KEY_S;

		 keyMap[4].Action = EKA_STRAFE_LEFT;
		 keyMap[4].KeyCode = KEY_LEFT;
		 keyMap[5].Action = EKA_STRAFE_LEFT;
		 keyMap[5].KeyCode = KEY_KEY_A;

		 keyMap[6].Action = EKA_STRAFE_RIGHT;
		 keyMap[6].KeyCode = KEY_RIGHT;
		 keyMap[7].Action = EKA_STRAFE_RIGHT;
		 keyMap[7].KeyCode = KEY_KEY_D;

		camera = sceneManager->addCameraSceneNodeFPS(0, 100, 500, -1, keyMap, 8);
		\endcode
		\param parent: Parent scene node of the camera. Can be null.
		\param rotateSpeed: Speed in degress with which the camera is
		rotated. This can be done only with the mouse.
		\param moveSpeed: Speed in units per millisecond with which
		the camera is moved. Movement is done with the cursor keys.
		\param id: id of the camera. This id can be used to identify the camera.
		\param keyMapArray: Optional pointer to an array of a keymap, specifying what
		keys should be used to move the camera. If this is null, the default keymap
		is used. You can define actions more then one time in the array, to bind
		multiple keys to the same action.
		\param keyMapSize: Amount of items in the keymap array.
		\param noVerticalMovement: Setting this to true makes the
		camera only move within a horizontal plane, and disables
		vertical movement as known from most ego shooters. Default is
		'false', with which it is possible to fly around in space, if
		no gravity is there.
		\param jumpSpeed: Speed with which the camera is moved when jumping.
		\param invertMouse: Setting this to true makes the camera look up when
		the mouse is moved down and down when the mouse is moved up, the default
		is 'false' which means it will follow the movement of the mouse cursor.
		\return Pointer to the interface of the camera if successful, otherwise 0.
		This pointer should not be dropped. See
		IReferenceCounted::drop() for more information. */
		virtual ICameraSceneNode* addCameraSceneNodeFPS(ISceneNode* parent = 0,
			f32 rotateSpeed = 100.0f, f32 moveSpeed = 0.5f, s32 id=-1,
			SKeyMap* keyMapArray=0, s32 keyMapSize=0, bool noVerticalMovement=false,
			f32 jumpSpeed = 0.f, bool invertMouse=false) = 0;

		//! Adds a dynamic light scene node to the scene graph.
		/** The light will cast dynamic light on all
		other scene nodes in the scene, which have the material flag video::MTF_LIGHTING
		turned on. (This is the default setting in most scene nodes).
		\param parent: Parent scene node of the light. Can be null. If the parent moves,
		the light will move too.
		\param position: Position of the space relative to its parent where the light will be placed.
		\param color: Diffuse color of the light. Ambient or Specular colors can be set manually with
		the ILightSceneNode::getLightData() method.
		\param radius: Radius of the light.
		\param id: id of the node. This id can be used to identify the node.
		\return Pointer to the interface of the light if successful, otherwise NULL.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ILightSceneNode* addLightSceneNode(ISceneNode* parent = 0,
			const core::vector3df& position = core::vector3df(0,0,0),
			video::SColorf color = video::SColorf(1.0f, 1.0f, 1.0f),
			f32 radius=100.0f, s32 id=-1) = 0;

		//! Adds a billboard scene node to the scene graph.
		/** A billboard is like a 3d sprite: A 2d element,
		which always looks to the camera. It is usually used for things like explosions, fire,
		lensflares and things like that.
		\param parent: Parent scene node of the billboard. Can be null. If the parent moves,
		the billboard will move too.
		\param position: Position of the space relative to its parent
		where the billboard will be placed.
		\param size: Size of the billboard. This size is 2 dimensional because a billboard only has
		width and height.
		\param id: An id of the node. This id can be used to identify the node.
		\param colorTop: The color of the vertices at the top of the billboard (default: white).
		\param colorBottom: The color of the vertices at the bottom of the billboard (default: white).
		\return Pointer to the billboard if successful, otherwise NULL.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IBillboardSceneNode* addBillboardSceneNode(ISceneNode* parent = 0,
			const core::dimension2d<f32>& size = core::dimension2d<f32>(10.0f, 10.0f),
			const core::vector3df& position = core::vector3df(0,0,0), s32 id=-1,
			video::SColor colorTop = 0xFFFFFFFF, video::SColor colorBottom = 0xFFFFFFFF) = 0;

		//! Adds a skybox scene node to the scene graph.
		/** A skybox is a big cube with 6 textures on it and
		is drawn around the camera position.
		\param top: Texture for the top plane of the box.
		\param bottom: Texture for the bottom plane of the box.
		\param left: Texture for the left plane of the box.
		\param right: Texture for the right plane of the box.
		\param front: Texture for the front plane of the box.
		\param back: Texture for the back plane of the box.
		\param parent: Parent scene node of the skybox. A skybox usually has no parent,
		so this should be null. Note: If a parent is set to the skybox, the box will not
		change how it is drawn.
		\param id: An id of the node. This id can be used to identify the node.
		\return Pointer to the sky box if successful, otherwise NULL.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNode* addSkyBoxSceneNode(video::ITexture* top, video::ITexture* bottom,
			video::ITexture* left, video::ITexture* right, video::ITexture* front,
			video::ITexture* back, ISceneNode* parent = 0, s32 id=-1) = 0;

		//! Adds a skydome scene node to the scene graph.
		/** A skydome is a large (half-) sphere with a panoramic texture
		on the inside and is drawn around the camera position.
		\param texture: Texture for the dome.
		\param horiRes: Number of vertices of a horizontal layer of the sphere.
		\param vertRes: Number of vertices of a vertical layer of the sphere.
		\param texturePercentage: How much of the height of the
		texture is used. Should be between 0 and 1.
		\param spherePercentage: How much of the sphere is drawn.
		Value should be between 0 and 2, where 1 is an exact
		half-sphere and 2 is a full sphere.
		\param parent: Parent scene node of the dome. A dome usually has no parent,
		so this should be null. Note: If a parent is set, the dome will not
		change how it is drawn.
		\param id: An id of the node. This id can be used to identify the node.
		\return Pointer to the sky dome if successful, otherwise NULL.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNode* addSkyDomeSceneNode(video::ITexture* texture,
			u32 horiRes=16, u32 vertRes=8,
			f32 texturePercentage=0.9, f32 spherePercentage=2.0,f32 radius = 1000.f,
			ISceneNode* parent=0, s32 id=-1) = 0;

		//! Adds a particle system scene node to the scene graph.
		/** \param withDefaultEmitter: Creates a default working point emitter
		which emitts some particles. Set this to true to see a particle system
		in action. If set to false, you'll have to set the emitter you want by
		calling IParticleSystemSceneNode::setEmitter().
		\param parent: Parent of the scene node. Can be NULL if no parent.
		\param id: Id of the node. This id can be used to identify the scene node.
		\param position: Position of the space relative to its parent where the
		scene node will be placed.
		\param rotation: Initital rotation of the scene node.
		\param scale: Initial scale of the scene node.
		\return Pointer to the created scene node.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IParticleSystemSceneNode* addParticleSystemSceneNode(
			bool withDefaultEmitter=true, ISceneNode* parent=0, s32 id=-1,
			const core::vector3df& position = core::vector3df(0,0,0),
			const core::vector3df& rotation = core::vector3df(0,0,0),
			const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f)) = 0;

		//! Adds a terrain scene node to the scene graph.
		/** This node implements is a simple terrain renderer which uses
		a technique known as geo mip mapping
		for reducing the detail of triangle blocks which are far away.
		The code for the TerrainSceneNode is based on the terrain
		renderer by Soconne and the GeoMipMapSceneNode developed by
		Spintz. They made their code available for Irrlicht and allowed
		it to be distributed under this licence. I only modified some
		parts. A lot of thanks go to them.

		This scene node is capable of loading terrains and updating
		the indices at runtime to enable viewing very large terrains
		very quickly. It uses a CLOD (Continuous Level of Detail)
		algorithm which updates the indices for each patch based on
		a LOD (Level of Detail) which is determined based on a patch's
		distance from the camera.

		The patch size of the terrain must always be a size of 2^N+1,
		i.e. 8+1(9), 16+1(17), etc.
		The MaxLOD available is directly dependent on the patch size
		of the terrain. LOD 0 contains all of the indices to draw all
		the triangles at the max detail for a patch. As each LOD goes
		up by 1 the step taken, in generating indices increases by
		-2^LOD, so for LOD 1, the step taken is 2, for LOD 2, the step
		taken is 4, LOD 3 - 8, etc. The step can be no larger than
		the size of the patch, so having a LOD of 8, with a patch size
		of 17, is asking the algoritm to generate indices every 2^8 (
		256 ) vertices, which is not possible with a patch size of 17.
		The maximum LOD for a patch size of 17 is 2^4 ( 16 ). So,
		with a MaxLOD of 5, you'll have LOD 0 ( full detail ), LOD 1 (
		every 2 vertices ), LOD 2 ( every 4 vertices ), LOD 3 ( every
		8 vertices ) and LOD 4 ( every 16 vertices ).
		\param heightMapFileName: The name of the file on disk, to read vertex data from. This should
		be a gray scale bitmap.
		\param parent: Parent of the scene node. Can be 0 if no parent.
		\param id: Id of the node. This id can be used to identify the scene node.
		\param position: The absolute position of this node.
		\param rotation: The absolute rotation of this node. ( NOT YET IMPLEMENTED )
		\param scale: The scale factor for the terrain. If you're
		using a heightmap of size 129x129 and would like your terrain
		to be 12900x12900 in game units, then use a scale factor of (
		core::vector ( 100.0f, 100.0f, 100.0f ). If you use a Y
		scaling factor of 0.0f, then your terrain will be flat.
		\param vertexColor: The default color of all the vertices. If no texture is associated
		with the scene node, then all vertices will be this color. Defaults to white.
		\param maxLOD: The maximum LOD (level of detail) for the node. Only change if you
		know what you are doing, this might lead to strange behaviour.
		\param patchSize: patch size of the terrain. Only change if you
		know what you are doing, this might lead to strange behaviour.
		\param smoothFactor: The number of times the vertices are smoothed.
		\param addAlsoIfHeightmapEmpty: Add terrain node even with empty heightmap.
		\return Pointer to the created scene node. Can be null
		if the terrain could not be created, for example because the
		heightmap could not be loaded. The returned pointer should
		not be dropped. See IReferenceCounted::drop() for more
		information. */
		virtual ITerrainSceneNode* addTerrainSceneNode(
			const core::string<c16>& heightMapFileName,
				ISceneNode* parent=0, s32 id=-1,
			const core::vector3df& position = core::vector3df(0.0f,0.0f,0.0f),
			const core::vector3df& rotation = core::vector3df(0.0f,0.0f,0.0f),
			const core::vector3df& scale = core::vector3df(1.0f,1.0f,1.0f),
			video::SColor vertexColor = video::SColor(255,255,255,255),
			s32 maxLOD=5, E_TERRAIN_PATCH_SIZE patchSize=ETPS_17, s32 smoothFactor=0,
			bool addAlsoIfHeightmapEmpty = false) = 0;

		//! Adds a terrain scene node to the scene graph.
		/** Just like the other addTerrainSceneNode() method, but takes an IReadFile
		pointer as parameter for the heightmap. For more informations take a look
		at the other function.
		\param heightMapFile: The file handle to read vertex data from. This should
		be a gray scale bitmap.
		\param parent: Parent of the scene node. Can be 0 if no parent.
		\param id: Id of the node. This id can be used to identify the scene node.
		\param position: The absolute position of this node.
		\param rotation: The absolute rotation of this node. ( NOT YET IMPLEMENTED )
		\param scale: The scale factor for the terrain. If you're
		using a heightmap of size 129x129 and would like your terrain
		to be 12900x12900 in game units, then use a scale factor of (
		core::vector ( 100.0f, 100.0f, 100.0f ). If you use a Y
		scaling factor of 0.0f, then your terrain will be flat.
		\param vertexColor: The default color of all the vertices. If no texture is associated
		with the scene node, then all vertices will be this color. Defaults to white.
		\param maxLOD: The maximum LOD (level of detail) for the node. Only change if you
		know what you are doing, this might lead to strange behaviour.
		\param patchSize: patch size of the terrain. Only change if you
		know what you are doing, this might lead to strange behaviour.
		\param smoothFactor: The number of times the vertices are smoothed.
		\param addAlsoIfHeightmapEmpty: Add terrain node even with empty heightmap.
		\return Pointer to the created scene node. Can be null
		if the terrain could not be created, for example because the
		heightmap could not be loaded. The returned pointer should
		not be dropped. See IReferenceCounted::drop() for more
		information. */
		virtual ITerrainSceneNode* addTerrainSceneNode(
			io::IReadFile* heightMapFile,
			ISceneNode* parent=0, s32 id=-1,
			const core::vector3df& position = core::vector3df(0.0f,0.0f,0.0f),
			const core::vector3df& rotation = core::vector3df(0.0f,0.0f,0.0f),
			const core::vector3df& scale = core::vector3df(1.0f,1.0f,1.0f),
			video::SColor vertexColor = video::SColor(255,255,255,255),
			s32 maxLOD=5, E_TERRAIN_PATCH_SIZE patchSize=ETPS_17, s32 smoothFactor=0,
			bool addAlsoIfHeightmapEmpty = false) = 0;

		//! Adds a quake3 scene node to the scene graph.
		/** A Quake3 Scene renders multiple meshes for a specific HighLanguage Shader (Quake3 Style )
		\return Pointer to the quake3 scene node if successful, otherwise NULL.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IMeshSceneNode* addQuake3SceneNode(IMeshBuffer* meshBuffer, const quake3::IShader * shader,
												ISceneNode* parent=0, s32 id=-1
												) = 0;


		//! Adds an empty scene node to the scene graph.
		/** Can be used for doing advanced transformations
		or structuring the scene graph.
		\return Pointer to the created scene node.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNode* addEmptySceneNode(ISceneNode* parent=0, s32 id=-1) = 0;

		//! Adds a dummy transformation scene node to the scene graph.
		/** This scene node does not render itself, and does not respond to set/getPosition,
		set/getRotation and set/getScale. Its just a simple scene node that takes a
		matrix as relative transformation, making it possible to insert any transformation
		anywhere into the scene graph.
		\return Pointer to the created scene node.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IDummyTransformationSceneNode* addDummyTransformationSceneNode(
			ISceneNode* parent=0, s32 id=-1) = 0;

		//! Adds a text scene node, which is able to display 2d text at a position in three dimensional space
		virtual ITextSceneNode* addTextSceneNode(gui::IGUIFont* font, const wchar_t* text,
			video::SColor color=video::SColor(100,255,255,255),
			ISceneNode* parent = 0, const core::vector3df& position = core::vector3df(0,0,0),
			s32 id=-1) = 0;

		//! Adds a text scene node, which uses billboards.  The node, and the text on it, will scale with distance.
		/**
		\param font The font to use on the billboard. Pass 0 to use the GUI environment's default font.
		\param text The text to display on the billboard.
		\param parent The billboard's parent.  Pass 0 to use the root scene node.
		\param size The billboard's width and height.
		\param position The billboards position relative to its parent.
		\param id: An id of the node. This id can be used to identify the node.
		\param colorTop: The color of the vertices at the top of the billboard (default: white).
		\param colorBottom: The color of the vertices at the bottom of the billboard (default: white).
		\return Pointer to the billboard if successful, otherwise NULL.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IBillboardTextSceneNode* addBillboardTextSceneNode( gui::IGUIFont* font, const wchar_t* text,
			ISceneNode* parent = 0,
			const core::dimension2d<f32>& size = core::dimension2d<f32>(10.0f, 10.0f),
			const core::vector3df& position = core::vector3df(0,0,0), s32 id=-1,
			video::SColor colorTop = 0xFFFFFFFF, video::SColor colorBottom = 0xFFFFFFFF) = 0;

		//! Adds a Hill Plane mesh to the mesh pool.
		/** The mesh is generated on the fly
		and looks like a plane with some hills on it. It is uses mostly for quick
		tests of the engine only. You can specify how many hills there should be
		on the plane and how high they should be. Also you must specify a name for
		the mesh, because the mesh is added to the mesh pool, and can be retrieved
		again using ISceneManager::getMesh() with the name as parameter.
		\param name: The name of this mesh which must be specified in order
		to be able to retrieve the mesh later with ISceneManager::getMesh().
		\param tileSize: Size of a tile of the mesh. (10.0f, 10.0f) would be a
		good value to start, for example.
		\param tileCount: Specifies how much tiles there will be. If you specifiy
		for example that a tile has the size (10.0f, 10.0f) and the tileCount is
		(10,10), than you get a field of 100 tiles which has the dimension 100.0fx100.0f.
		\param material: Material of the hill mesh.
		\param hillHeight: Height of the hills. If you specify a negative value
		you will get holes instead of hills. If the height is 0, no hills will be
		created.
		\param countHills: Amount of hills on the plane. There will be countHills.X
		hills along the X axis and countHills.Y along the Y axis. So in total there
		will be countHills.X * countHills.Y hills.
		\param textureRepeatCount: Defines how often the texture will be repeated in
		x and y direction.
		return Null if the creation failed. The reason could be that you
		specified some invalid parameters or that a mesh with that name already
		exists. If successful, a pointer to the mesh is returned.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IAnimatedMesh* addHillPlaneMesh(const core::string<c16>& name,
			const core::dimension2d<f32>& tileSize, const core::dimension2d<u32>& tileCount,
			video::SMaterial* material = 0, f32 hillHeight = 0.0f,
			const core::dimension2d<f32>& countHills = core::dimension2d<f32>(0.0f, 0.0f),
			const core::dimension2d<f32>& textureRepeatCount = core::dimension2d<f32>(1.0f, 1.0f)) = 0;

		//! Adds a static terrain mesh to the mesh pool.
		/** The mesh is generated on the fly
		from a texture file and a height map file. Both files may be huge
		(8000x8000 pixels would be no problem) because the generator splits the
		files into smaller textures if necessary.
		You must specify a name for the mesh, because the mesh is added to the mesh pool,
		and can be retrieved again using ISceneManager::getMesh() with the name as parameter.
		\param meshname: The name of this mesh which must be specified in order
		to be able to retrieve the mesh later with ISceneManager::getMesh().
		\param texture: Texture for the terrain. Please note that this is not a
		hardware texture as usual (ITexture), but an IImage software texture.
		You can load this texture with IVideoDriver::createImageFromFile().
		\param heightmap: A grayscaled heightmap image. Like the texture,
		it can be created with IVideoDriver::createImageFromFile(). The amount
		of triangles created depends on the size of this texture, so use a small
		heightmap to increase rendering speed.
		\param stretchSize: Parameter defining how big a is pixel on the heightmap.
		\param maxHeight: Defines how high a white pixel on the heighmap is.
		\param defaultVertexBlockSize: Defines the initial dimension between vertices.
		\return Null if the creation failed. The reason could be that you
		specified some invalid parameters, that a mesh with that name already
		exists, or that a texture could not be found. If successful, a pointer to the mesh is returned.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IAnimatedMesh* addTerrainMesh(const core::string<c16>& meshname,
			video::IImage* texture, video::IImage* heightmap,
			const core::dimension2d<f32>& stretchSize = core::dimension2d<f32>(10.0f,10.0f),
			f32 maxHeight=200.0f,
			const core::dimension2d<u32>& defaultVertexBlockSize = core::dimension2d<u32>(64,64)) = 0;

		//! add a static arrow mesh to the meshpool
		/** \param name Name of the mesh
		\param vtxColor0 color of the cylinder
		\param vtxColor1 color of the cone
		\param tesselationCylinder Number of quads the cylinder side consists of
		\param tesselationCone Number of triangles the cone's roof consits of
		\param height Total height of the arrow
		\param cylinderHeight Total height of the cylinder, should be lesser than total height
		\param width0 Diameter of the cylinder
		\param width1 Diameter of the cone's base, should be not smaller than the cylinder's diameter
		\return Pointer to the arrow mesh if successful, otherwise 0.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IAnimatedMesh* addArrowMesh(const core::string<c16>& name,
				video::SColor vtxColor0=0xFFFFFFFF,
				video::SColor vtxColor1=0xFFFFFFFF,
				u32 tesselationCylinder=4, u32 tesselationCone=8,
				f32 height=1.f, f32 cylinderHeight=0.6f,
				f32 width0=0.05f, f32 width1=0.3f) = 0;

		//! add a static sphere mesh to the meshpool
		/** \param name Name of the mesh
		\param radius Radius of the sphere
		\param polyCountX Number of quads used for the horizontal tiling
		\param polyCountY Number of quads used for the vertical tiling
		\return Pointer to the sphere mesh if successful, otherwise 0.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IAnimatedMesh* addSphereMesh(const core::string<c16>& name,
				f32 radius=5.f, u32 polyCountX = 16,
				u32 polyCountY = 16) = 0;

		//! Gets the root scene node.
		/** This is the scene node which is parent
		of all scene nodes. The root scene node is a special scene node which
		only exists to manage all scene nodes. It will not be rendered and cannot
		be removed from the scene.
		\return Pointer to the root scene node.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNode* getRootSceneNode() = 0;

		//! Get the first scene node with the specified id.
		/** \param id: The id to search for
		\param start: Scene node to start from. All children of this scene
		node are searched. If null is specified, the root scene node is
		taken.
		\return Pointer to the first scene node with this id,
		and null if no scene node could be found.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNode* getSceneNodeFromId(s32 id, ISceneNode* start=0) = 0;

		//! Get the first scene node with the specified name.
		/** \param name: The name to search for
		\param start: Scene node to start from. All children of this scene
		node are searched. If null is specified, the root scene node is
		taken.
		\return Pointer to the first scene node with this id,
		and null if no scene node could be found.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNode* getSceneNodeFromName(const c8* name, ISceneNode* start=0) = 0;

		//! Get the first scene node with the specified type.
		/** \param type: The type to search for
		\param start: Scene node to start from. All children of this scene
		node are searched. If null is specified, the root scene node is
		taken.
		\return Pointer to the first scene node with this type,
		and null if no scene node could be found.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNode* getSceneNodeFromType(scene::ESCENE_NODE_TYPE type, ISceneNode* start=0) = 0;

		//! Get scene nodes by type.
		/** \param type: Type of scene node to find (ESNT_ANY will return all child nodes).
		\param outNodes: array to be filled with results.
		\param start: Scene node to start from. All children of this scene
		node are searched. If null is specified, the root scene node is
		taken. */
		virtual void getSceneNodesFromType(ESCENE_NODE_TYPE type,
				core::array<scene::ISceneNode*>& outNodes,
				ISceneNode* start=0) = 0;

		//! Get the current active camera.
		/** \return The active camera is returned. Note that this can
		be NULL, if there was no camera created yet.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ICameraSceneNode* getActiveCamera() = 0;

		//! Sets the currently active camera.
		/** The previous active camera will be deactivated.
		\param camera: The new camera which should be active. */
		virtual void setActiveCamera(ICameraSceneNode* camera) = 0;

		//! Sets the color of stencil buffers shadows drawn by the scene manager.
		virtual void setShadowColor(video::SColor color = video::SColor(150,0,0,0)) = 0;

		//! Get the current color of shadows.
		virtual video::SColor getShadowColor() const = 0;

		//! Registers a node for rendering it at a specific time.
		/** This method should only be used by SceneNodes when they get a
		ISceneNode::OnRegisterSceneNode() call.
		\param node: Node to register for drawing. Usually scene nodes would set 'this'
		as parameter here because they want to be drawn.
		\param pass: Specifies when the node wants to be drawn in relation to the other nodes.
		For example, if the node is a shadow, it usually wants to be drawn after all other nodes
		and will use ESNRP_SHADOW for this. See scene::E_SCENE_NODE_RENDER_PASS for details.
		\return scene will be rendered ( passed culling ) */
		virtual u32 registerNodeForRendering(ISceneNode* node,
			E_SCENE_NODE_RENDER_PASS pass = ESNRP_AUTOMATIC) = 0;

		//! Draws all the scene nodes.
		/** This can only be invoked between
		IVideoDriver::beginScene() and IVideoDriver::endScene(). Please note that
		the scene is not only drawn when calling this, but also animated
		by existing scene node animators, culling of scene nodes is done, etc. */
		virtual void drawAll() = 0;

		//! Creates a rotation animator, which rotates the attached scene node around itself.
		/** \param rotationSpeed Specifies the speed of the animation in degree per 10 milliseconds.
		\return The animator. Attach it to a scene node with ISceneNode::addAnimator()
		and the animator will animate it.
		If you no longer need the animator, you should call ISceneNodeAnimator::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeAnimator* createRotationAnimator(const core::vector3df& rotationSpeed) = 0;

		//! Creates a fly circle animator, which lets the attached scene node fly around a center.
		/** \param center: Center of the circle.
		\param radius: Radius of the circle.
		\param speed: The orbital speed, in radians per millisecond.
		\param direction: Specifies the upvector used for alignment of the mesh.
		\param startPosition: The position on the circle where the animator will
		begin. Value is in multiples  of a circle, i.e. 0.5 is half way around. (phase)
		\param radiusEllipsoid: if radiusEllipsoid != 0 then radius2 froms a ellipsoid
		begin. Value is in multiples  of a circle, i.e. 0.5 is half way around. (phase)
		\return The animator. Attach it to a scene node with ISceneNode::addAnimator()
		and the animator will animate it.
		If you no longer need the animator, you should call ISceneNodeAnimator::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeAnimator* createFlyCircleAnimator(
				const core::vector3df& center=core::vector3df(0.f,0.f,0.f),
				f32 radius=100.f, f32 speed=0.001f,
				const core::vector3df& direction=core::vector3df(0.f, 1.f, 0.f),
				f32 startPosition = 0.f,
				f32 radiusEllipsoid = 0.f) = 0;

		//! Creates a fly straight animator, which lets the attached scene node fly or move along a line between two points.
		/** \param startPoint: Start point of the line.
		\param endPoint: End point of the line.
		\param timeForWay: Time in milli seconds how long the node should need to
		move from the start point to the end point.
		\param loop: If set to false, the node stops when the end point is reached.
		If loop is true, the node begins again at the start.
		\return The animator. Attach it to a scene node with ISceneNode::addAnimator()
		and the animator will animate it.
		If you no longer need the animator, you should call ISceneNodeAnimator::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeAnimator* createFlyStraightAnimator(const core::vector3df& startPoint,
			const core::vector3df& endPoint, u32 timeForWay, bool loop=false, bool pingpong = false) = 0;

		//! Creates a texture animator, which switches the textures of the target scene node based on a list of textures.
		/** \param textures: List of textures to use.
		\param timePerFrame: Time in milliseconds, how long any texture in the list
		should be visible.
		\param loop: If set to to false, the last texture remains set, and the animation
		stops. If set to true, the animation restarts with the first texture.
		\return The animator. Attach it to a scene node with ISceneNode::addAnimator()
		and the animator will animate it.
		If you no longer need the animator, you should call ISceneNodeAnimator::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeAnimator* createTextureAnimator(const core::array<video::ITexture*>& textures,
			s32 timePerFrame, bool loop=true) = 0;

		//! Creates a scene node animator, which deletes the scene node after some time automatically.
		/** \param timeMs: Time in milliseconds, after when the node will be deleted.
		\return The animator. Attach it to a scene node with ISceneNode::addAnimator()
		and the animator will animate it.
		If you no longer need the animator, you should call ISceneNodeAnimator::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeAnimator* createDeleteAnimator(u32 timeMs) = 0;

		//! Creates a special scene node animator for doing automatic collision detection and response.
		/** See ISceneNodeAnimatorCollisionResponse for details.
		\param world: Triangle selector holding all triangles of the world with which
		the scene node may collide. You can create a triangle selector with
		ISceneManager::createTriangleSelector();
		\param sceneNode: SceneNode which should be manipulated. After you added this animator
		to the scene node, the scene node will not be able to move through walls and is
		affected by gravity.  If you need to teleport the scene node to a new position without
		it being effected by the collision geometry, then call sceneNode->setPosition(); then
		animator->setTargetNode(sceneNode);
		\param ellipsoidRadius: Radius of the ellipsoid with which collision detection and
		response is done. If you have got a scene node, and you are unsure about
		how big the radius should be, you could use the following code to determine
		it:
		\code
		const core::aabbox3d<f32>& box = yourSceneNode->getBoundingBox();
		core::vector3df radius = box.MaxEdge - box.getCenter();
		\endcode
		\param gravityPerSecond: Sets the gravity of the environment, as an acceleration in
		units per second per second. If your units are equivalent to metres, then
		core::vector3df(0,-10.0f,0) would give an approximately realistic gravity.
		You can disable gravity by setting it to core::vector3df(0,0,0).
		\param ellipsoidTranslation: By default, the ellipsoid for collision detection is created around
		the center of the scene node, which means that the ellipsoid surrounds
		it completely. If this is not what you want, you may specify a translation
		for the ellipsoid.
		\param slidingValue: DOCUMENTATION NEEDED.
		\return The animator. Attach it to a scene node with ISceneNode::addAnimator()
		and the animator will cause it to do collision detection and response.
		If you no longer need the animator, you should call ISceneNodeAnimator::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeAnimatorCollisionResponse* createCollisionResponseAnimator(
			ITriangleSelector* world, ISceneNode* sceneNode,
			const core::vector3df& ellipsoidRadius = core::vector3df(30,60,30),
			const core::vector3df& gravityPerSecond = core::vector3df(0,-10.0f,0),
			const core::vector3df& ellipsoidTranslation = core::vector3df(0,0,0),
			f32 slidingValue = 0.0005f) = 0;

		//! Creates a follow spline animator.
		/** The animator modifies the position of
		the attached scene node to make it follow a hermite spline.
		It uses a subset of hermite splines: either cardinal splines
		(tightness != 0.5) or catmull-rom-splines (tightness == 0.5).
		The animator moves from one control point to the next in
		1/speed seconds. This code was sent in by Matthias Gall.
		If you no longer need the animator, you should call ISceneNodeAnimator::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeAnimator* createFollowSplineAnimator(s32 startTime,
			const core::array< core::vector3df >& points,
			f32 speed = 1.0f, f32 tightness = 0.5f) = 0;

		//! Creates a simple ITriangleSelector, based on a mesh.
		/** Triangle selectors
		can be used for doing collision detection. Don't use this selector
		for a huge amount of triangles like in Quake3 maps.
		Instead, use for example ISceneManager::createOctTreeTriangleSelector().
		Please note that the created triangle selector is not automaticly attached
		to the scene node. You will have to call ISceneNode::setTriangleSelector()
		for this. To create and attach a triangle selector is done like this:
		\code
		ITriangleSelector* s = sceneManager->createTriangleSelector(yourMesh,
				yourSceneNode);
		yourSceneNode->setTriangleSelector(s);
		s->drop();
		\endcode
		\param mesh: Mesh of which the triangles are taken.
		\param node: Scene node of which visibility and transformation is used.
		\return The selector, or null if not successful.
		If you no longer need the selector, you should call ITriangleSelector::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ITriangleSelector* createTriangleSelector(IMesh* mesh, ISceneNode* node) = 0;

		//! Creates a simple ITriangleSelector, based on an animated mesh scene node.
		//! Details of the mesh associated with the node will be extracted internally.
		//! Call ITriangleSelector::update() to have the triangle selector updated based
		//! on the current frame of the animated mesh scene node.
		//! \param: The animated mesh scene node from which to build the selector
		virtual ITriangleSelector* createTriangleSelector(IAnimatedMeshSceneNode* node) = 0;


		//! Creates a simple dynamic ITriangleSelector, based on a axis aligned bounding box.
		/** Triangle selectors
		can be used for doing collision detection. Every time when triangles are
		queried, the triangle selector gets the bounding box of the scene node,
		an creates new triangles. In this way, it works good with animated scene nodes.
		\param node: Scene node of which the bounding box, visibility and transformation is used.
		\return The selector, or null if not successful.
		If you no longer need the selector, you should call ITriangleSelector::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ITriangleSelector* createTriangleSelectorFromBoundingBox(ISceneNode* node) = 0;

		//! Creates a Triangle Selector, optimized by an octtree.
		/** Triangle selectors
		can be used for doing collision detection. This triangle selector is
		optimized for huge amounts of triangle, it organizes them in an octtree.
		Please note that the created triangle selector is not automaticly attached
		to the scene node. You will have to call ISceneNode::setTriangleSelector()
		for this. To create and attach a triangle selector is done like this:
		\code
		ITriangleSelector* s = sceneManager->createOctTreeTriangleSelector(yourMesh,
				yourSceneNode);
		yourSceneNode->setTriangleSelector(s);
		s->drop();
		\endcode
		For more informations and examples on this, take a look at the collision
		tutorial in the SDK.
		\param mesh: Mesh of which the triangles are taken.
		\param node: Scene node of which visibility and transformation is used.
		\param minimalPolysPerNode: Specifies the minimal polygons contained a octree node.
		If a node gets less polys the this value, it will not be splitted into
		smaller nodes.
		\return The selector, or null if not successful.
		If you no longer need the selector, you should call ITriangleSelector::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ITriangleSelector* createOctTreeTriangleSelector(IMesh* mesh,
			ISceneNode* node, s32 minimalPolysPerNode=32) = 0;

		//! Creates a meta triangle selector.
		/** A meta triangle selector is nothing more than a
		collection of one or more triangle selectors providing together
		the interface of one triangle selector. In this way,
		collision tests can be done with different triangle soups in one pass.
		\return The selector, or null if not successful.
		If you no longer need the selector, you should call ITriangleSelector::drop().
		See IReferenceCounted::drop() for more information. */
		virtual IMetaTriangleSelector* createMetaTriangleSelector() = 0;

		//! Creates a triangle selector which can select triangles from a terrain scene node.
		/** \param node: Pointer to the created terrain scene node
		\param LOD: Level of detail, 0 for highest detail.
		\return The selector, or null if not successful.
		If you no longer need the selector, you should call ITriangleSelector::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ITriangleSelector* createTerrainTriangleSelector(
			ITerrainSceneNode* node, s32 LOD=0) = 0;

		//! Adds an external mesh loader for extending the engine with new file formats.
		/** If you want the engine to be extended with
		file formats it currently is not able to load (e.g. .cob), just implement
		the IMeshLoader interface in your loading class and add it with this method.
		Using this method it is also possible to override built-in mesh loaders with
		newer or updated versions without the need of recompiling the engine.
		\param externalLoader: Implementation of a new mesh loader. */
		virtual void addExternalMeshLoader(IMeshLoader* externalLoader) = 0;

		//! Get pointer to the scene collision manager.
		/** \return Pointer to the collision manager
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneCollisionManager* getSceneCollisionManager() = 0;

		//! Get pointer to the mesh manipulator.
		/** \return Pointer to the mesh manipulator
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual IMeshManipulator* getMeshManipulator() = 0;

		//! Adds a scene node to the deletion queue.
		/** The scene node is immediatly
		deleted when it's secure. Which means when the scene node does not
		execute animators and things like that. This method is for example
		used for deleting scene nodes by their scene node animators. In
		most other cases, a ISceneNode::remove() call is enough, using this
		deletion queue is not necessary.
		See ISceneManager::createDeleteAnimator() for details.
		\param node: Node to detete. */
		virtual void addToDeletionQueue(ISceneNode* node) = 0;

		//! Posts an input event to the environment.
		/** Usually you do not have to
		use this method, it is used by the internal engine. */
		virtual bool postEventFromUser(const SEvent& event) = 0;

		//! Clears the whole scene.
		/** All scene nodes are removed. */
		virtual void clear() = 0;

		//! Get interface to the parameters set in this scene.
		/** String parameters can be used by plugins and mesh loaders.
		For example the CMS and LMTS loader want a parameter named 'CSM_TexturePath'
		and 'LMTS_TexturePath' set to the path were attached textures can be found. See
		CSM_TEXTURE_PATH, LMTS_TEXTURE_PATH, MY3D_TEXTURE_PATH,
		COLLADA_CREATE_SCENE_INSTANCES, DMF_TEXTURE_PATH and DMF_USE_MATERIALS_DIRS*/
		virtual io::IAttributes* getParameters() = 0;

		//! Get current render pass.
		/** All scene nodes are being rendered in a specific order.
		First lights, cameras, sky boxes, solid geometry, and then transparent
		stuff. During the rendering process, scene nodes may want to know what the scene
		manager is rendering currently, because for example they registered for rendering
		twice, once for transparent geometry and once for solid. When knowing what rendering
		pass currently is active they can render the correct part of their geometry. */
		virtual E_SCENE_NODE_RENDER_PASS getSceneNodeRenderPass() const = 0;

		//! Get the default scene node factory which can create all built in scene nodes
		/** \return Pointer to the default scene node factory
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeFactory* getDefaultSceneNodeFactory() = 0;

		//! Adds a scene node factory to the scene manager.
		/** Use this to extend the scene manager with new scene node types which it should be
		able to create automaticly, for example when loading data from xml files. */
		virtual void registerSceneNodeFactory(ISceneNodeFactory* factoryToAdd) = 0;

		//! Get amount of registered scene node factories.
		virtual u32 getRegisteredSceneNodeFactoryCount() const = 0;

		//! Get a scene node factory by index
		/** \return Pointer to the requested scene node factory, or 0 if it does not exist.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeFactory* getSceneNodeFactory(u32 index) = 0;

		//! Get the default scene node animator factory which can create all built-in scene node animators
		/** \return Pointer to the default scene node animator factory
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeAnimatorFactory* getDefaultSceneNodeAnimatorFactory() = 0;

		//! Adds a scene node animator factory to the scene manager.
		/** Use this to extend the scene manager with new scene node animator types which it should be
		able to create automaticly, for example when loading data from xml files. */
		virtual void registerSceneNodeAnimatorFactory(ISceneNodeAnimatorFactory* factoryToAdd) = 0;

		//! Get amount of registered scene node animator factories.
		virtual u32 getRegisteredSceneNodeAnimatorFactoryCount() const = 0;

		//! Get scene node animator factory by index
		/** \return Pointer to the requested scene node animator factory, or 0 if it does not exist.
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNodeAnimatorFactory* getSceneNodeAnimatorFactory(u32 index) = 0;

		//! Get typename from a scene node type or null if not found
		virtual const c8* getSceneNodeTypeName(ESCENE_NODE_TYPE type) = 0;

		//! Returns a typename from a scene node animator type or null if not found
		virtual const c8* getAnimatorTypeName(ESCENE_NODE_ANIMATOR_TYPE type) = 0;

		//! Adds a scene node to the scene by name
		/** \return Pointer to the scene node added by a factory
		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
		virtual ISceneNode* addSceneNode(const char* sceneNodeTypeName, ISceneNode* parent=0) = 0;

		//! Creates a new scene manager.
		/** This can be used to easily draw and/or store two
		independent scenes at the same time. The mesh cache will be
		shared between all existing scene managers, which means if you
		load a mesh in the original scene manager using for example
		getMesh(), the mesh will be available in all other scene
		managers too, without loading.
		The original/main scene manager will still be there and
		accessible via IrrlichtDevice::getSceneManager(). If you need
		input event in this new scene manager, for example for FPS
		cameras, you'll need to forward input to this manually: Just
		implement an IEventReceiver and call
		yourNewSceneManager->postEventFromUser(), and return true so
		that the original scene manager doesn't get the event.
		Otherwise, all input will go to the main scene manager
		automatically.
		If you no longer need the new scene manager, you should call
		ISceneManager::drop().
		See IReferenceCounted::drop() for more information. */
		virtual ISceneManager* createNewSceneManager(bool cloneContent=false) = 0;

		//! Saves the current scene into a file.
		/** Scene nodes with the option isDebugObject set to true are not being saved.
		The scene is usually written to an .irr file, an xml based format. .irr files can
		Be edited with the Irrlicht Engine Editor, irrEdit (http://irredit.irrlicht3d.org).
		To load .irr files again, see ISceneManager::loadScene().
		\param filename: Name of the file.
		\param userDataSerializer: If you want to save some user data for every scene node into the
		file, implement the ISceneUserDataSerializer interface and provide it as parameter here.
		Otherwise, simply specify 0 as this parameter.
		\return True if successful. */
		virtual bool saveScene(const core::string<c16>& filename, ISceneUserDataSerializer* userDataSerializer=0) = 0;

		//! Saves the current scene into a file.
		/** Scene nodes with the option isDebugObject set to true are not being saved.
		The scene is usually written to an .irr file, an xml based format. .irr files can
		Be edited with the Irrlicht Engine Editor, irrEdit (http://irredit.irrlicht3d.org).
		To load .irr files again, see ISceneManager::loadScene().
		\param file: File where the scene is saved into.
		\param userDataSerializer: If you want to save some user data for every scene node into the
		file, implement the ISceneUserDataSerializer interface and provide it as parameter here.
		Otherwise, simply specify 0 as this parameter.
		\return True if successful. */
		virtual bool saveScene(io::IWriteFile* file, ISceneUserDataSerializer* userDataSerializer=0) = 0;

		//! Loads a scene. Note that the current scene is not cleared before.
		/** The scene is usually load from an .irr file, an xml based format. .irr files can
		Be edited with the Irrlicht Engine Editor, irrEdit (http://irredit.irrlicht3d.org) or
		saved directly by the engine using ISceneManager::saveScene().
		\param filename: Name of the file.
		\param userDataSerializer: If you want to load user data
		possibily saved in that file for some scene nodes in the file,
		implement the ISceneUserDataSerializer interface and provide it
		as parameter here. Otherwise, simply specify 0 as this
		parameter.
		\return True if successful. */
		virtual bool loadScene(const core::string<c16>& filename, ISceneUserDataSerializer* userDataSerializer=0) = 0;

		//! Loads a scene. Note that the current scene is not cleared before.
		/** The scene is usually load from an .irr file, an xml based format. .irr files can
		Be edited with the Irrlicht Engine Editor, irrEdit (http://irredit.irrlicht3d.org) or
		saved directly by the engine using ISceneManager::saveScene().
		\param file: File where the scene is going to be saved into.
		\param userDataSerializer: If you want to load user data
		possibily saved in that file for some scene nodes in the file,
		implement the ISceneUserDataSerializer interface and provide it
		as parameter here. Otherwise, simply specify 0 as this
		parameter.
		\return True if successful. */
		virtual bool loadScene(io::IReadFile* file, ISceneUserDataSerializer* userDataSerializer=0) = 0;

		//! Get a mesh writer implementation if available
		/** Note: You need to drop() the pointer after use again, see IReferenceCounted::drop()
		for details. */
		virtual IMeshWriter* createMeshWriter(EMESH_WRITER_TYPE type) = 0;

		//! Sets ambient color of the scene
		virtual void setAmbientLight(const video::SColorf &ambientColor) = 0;

		//! Get ambient color of the scene
		virtual const video::SColorf& getAmbientLight() const = 0;

		//! Register a custom callbacks manager which gets callbacks during scene rendering.
		/** \param[in] lightManager: the new callbacks manager.  You may pass 0 to remove the
			current callbacks manager and restore the default behaviour. */
		virtual void setLightManager(ILightManager* lightManager) = 0;

		//! Get an instance of a geometry creator.
		/** The geometry creator provides some helper methods to create various types of
		basic geometry.  This can be useful for custom scene nodes. */
		virtual const IGeometryCreator* getGeometryCreator(void) const = 0;
	};


} // end namespace scene
} // end namespace irr

#endif

