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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.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1449 dfc29bdd-3216-0410-991c-e03cc46cb475

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.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1444 dfc29bdd-3216-0410-991c-e03cc46cb475

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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Added some enhancements for scene graph traversal and an example for collision checking with .irr scenes from rogerborg.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1432 dfc29bdd-3216-0410-991c-e03cc46cb475

Added fix by drewbacca which avoids spinning camera if the event receiver is disabled while mouse was moved.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1430 dfc29bdd-3216-0410-991c-e03cc46cb475

Added node creation callback patch from fullmetalcoder. This allows a callback per created scene node for .irr scene loading.

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This fixes wrong child handling in AnimatedMesh SceneNode, 2dimage clipping in d3d drivers, and a string handling issue in example 16.

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Moved the arrow mesh parts into separate mesh constructor methods for cylinder and cone. Not yet exposed in the API.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1410 dfc29bdd-3216-0410-991c-e03cc46cb475