Am 16.12.2013 23:03, schrieb jhu:

> 3) The paper is two triangles using double_illumination. In front of those
> triangles are another two filtered triangle to dim the light coming back out. I
> had a hard time figuring out how to get this effect. Initially I was using some
> blurred transparency, but that just looked like frosted glass. Then I tried
> scattering media but couldn't get that to work either.

Instead of the double_illumination, do try diffuse backside 
illumination, activated by a second parameter to "diffuse", e.g.:

   finish { diffuse 0.7, 0.3 }

This does essentially the same as double_illumination except that you 
can control the brightness.

Post a reply to this message