From: Axel Kohlmeyer (
Date: Fri Jan 28 2011 - 09:56:06 CST

2011/1/28 Ajasja Ljubetič <>:
> Dear All,
> I'm still having trouble rendering highly transparent (alpha is set to
> 0.02) spheres in Tachyon or pov-ray.
> This is a screen shot, tachyon gives this, pov-ray gives this.
> I'm happy with the screenshot, but I would need a higher resolution for
> printing.


transparency is a situation where raytracing will
give you different results than GLSL due to the
approximations done in OpenGL rendering.

for that kind of visualization you are better off using
a Surf representation for the transparent part and
then use one of the materials with angle dependent
transparency (BlownGlass or GlassBubble). check out:
as an example.


> Best regards,
> Ajasja
> 2010/12/8 Ajasja Ljubetič <>
>> Dear all,
>> I'm having some trouble rendering a scene with multiple transparent
>> spheres. In VMD the scene is fine, but using Tachyon the transparency is
>> different.
>> Since a picture is worth a thousand words i'm also attaching one:)
>> I also put the trouble.dat online.
>> Best regards,
>> Ajasja Ljubetič,
>> Young researcher,
>> Department of solid state physics,
>> Institute Jožef Štefan,
>> Ljubljana Slovenia

Dr. Axel Kohlmeyer
Institute for Computational Molecular Science
Temple University, Philadelphia PA, USA.