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Merge revisions 1495:1497 from 1.4 branch. GUIImage fix by CuteAlien. Default value changes in particle system and scene manager.

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Merge revisions 1489:1494 from 1.4 branch. Mainly cleanup, removal of .NET wrapper, and postEventFromUser patch to return if the event was absorbed.

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Prevent b3d loader to load textures from unused materials. Other mesh loader might still suffer from this.

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Added new mMeshManipulator method scaleTCoords to scale texture coords of a mesh. Added two new access methods to texture coords of vertices of a meshbuffer. This allowed to replace the template for planar mapping as well.

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Added support for proxy meshes as source of the shadow volume. This enables the use of a simplified version of a mesh for the generation of the shadow volume, which can significantly improve the render performance with shadow volumes. Patch provided by tonic.

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Allow read-only locking of textures, which may improve the performance due to optimized access to the data and skipped updates when unlocking.

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Removed unused parameter from win32 OpenGL setup. Separated wrap mode handling into new method in ogl driver. Fixed pixel alignment in ogl pixel transfers to avoid problems on special systems. Fixed an info message to be printed always, not just for big endian systems.

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Implementation of UserData passing from the system event receiver to the Irrlicht IEventReceiver. Currently only available for Windows (thanks to rogerborg) and Linux.

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Camera interface changed such that projection matrix and isOrthogonal flag are changed together, if necessary. Patch provided by rogerborg.

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new meshbuffer has split vertex and index buffers and supports switching between different vertex and index(16/32bit) types at runtime.

some parts like CSpecific(Vertex/Index)List may need to be optimized. may change to use plain switches, having options (like 32bit) able to be undefined.

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Some driver cleanup. Fixed the issues with external window usage under OpenGL and Linux. Added error checking for VBO usage.

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Some Q3 example changes. OctTree has been reenabled with larger vertex numbers. Example 16 now accepts pk3 files and bsp levels on the command line, and it can display the bounding boxes of octrees.

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