Re: [Mesa3d-users] GL_POINT_DISTANCE_ATTENUATION

[Brian P. <br...@vm...>]

Owen Kaluza wrote:
> 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.

Could you prune down your test program a bit?  Perhaps you could draw 
a series of points between the min/max Z positions and see how they look.

-Brian