Well it nothing more then a math matrix code being used to help to cull entity's and light's. I replaced the old crappy culling code with render matrix for better performance but it wasn't too much. This is just a math matrix code that use C++ generic and Intrinsics if enabled can speed up math calculations being applied to the portal culling system so it's suppose to be a bit faster, with this in mind I believe you guys can use this to further improve the culling system.