[Mesa3d-users] GL_POINT_DISTANCE_ATTENUATION

[Owen K. <Owe...@sc...>]

Hello,
I'm having trouble with point distance attenuation using OSMesa.
I'm rendering a lot of depth sorted, alpha blended, textured points and
dark bands are appearing that are not there when I render with the
system GL.

I found the problem only occurs with point distance attenuation turned on.
If you look at the attached image you can see there are clearly defined
bands, possibly the point size calculation is incorrect at certain
distances resulting in size jumps.

I've attached a sample program that reproduces the problem. Also tried
the latest Mesalib code (Mesa-7.7-devel-20091105) and is still occurring.

Thanks,
Owen.