what's the difference between PointScaleA,PointScaleB and PointScaleC

I'm doing a research on particle system, downloaded a example, but I confused about the PointScaleA,PointScaleB,PointScaleC, the dx9 document give them the same discription. Please help me, tell me the difference. Thanks!

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what's the difference between PointScaleA,PointScaleB and PointScaleC

  • R.Beaumont

    It's like the attenuation values for lights, except based on the point sprite's distance from the camera.

    See "DirectX Graphics / Programming Guide / Advanced Topics / Vertex Pipeline / Point Sprites" in the SDK help.

  • what's the difference between PointScaleA,PointScaleB and PointScaleC