yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> > What would you think of using glLists for display, like suggested in 
> > this commit?
> > Any idea on why there this an excess of white light on precompiled 
> > spheres would be welcome (see the image at
> > https://bugs.launchpad.net/yade/+bug/509084).
> >     
>
> Is that question at me? I think we should keep the default without
> stripes, you can use Gl1_Sphere(stripes=True) for stripes. Some problem
> with that?
>
>   
The first question, yes.
I was not thinking about changing the default but using the combination 
of glList and glutSolidSphere, wich is very common in gl code, the 
commented code I included in the commit was :

if (noList) {
glNewList
   glutSolidSphere
glEndList}
callList

It _theoreticaly_ converts glutSolidSphere into gl instructions, so that 
any sqrt, division, cos,... computations in glutSolidSphere are done 
only once, and the results are "hardcoded" in graphic card directives. I 
couldn't really measure a better performance however, and I found out 
(googling), that the gain can be negligible, especially with AUX, where 
the implementation of glLists sucks. On MS windows, I remember it made a 
big difference (using gluSphere instead of glutSolidSphere, but it 
should not explain the change).

Anyway, there is this lighting problem with glList at the moment, with 
and without stripes, so that glList is not an option. That was the 
second question (for anybody). In your case, do you remember making some 
changes in some light parameters, diffuse colors,...  recently? I 
couldn't spot any difference in the code yet, but for sure the old 
stripes code doesn't give the old result (see image in the bug report), 
and is not usable. Or you tested it and found no problem on your side?

Bruno