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doing it within the render mode itself would be the best course of action.
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Which means, within the render mode, to do it in a hardware accelerated fashion, its possible to use render to texture & offscreen textures. The D3D renderer uses auxiliary textures for motion blur, and flips between them by using a XOR operation to alternate frames. To add to that, there will need to be a texture to capture the screen with, and that can eat up memory bandwidth, especially on low end systems.