"Lothar" <les### [at] helixnihgov> wrote:
> triangle {
>
>   <-1,-0.5,0>, <0.0,0.5,0.0>, <1,-0.5,0>
>   translate <1.4, 0.8,0>
>   scale 0.11
>   rotate z*45
>   texture { pigment { color rgbt <0.8, 0.8, 0.8, TrigTrans> }
>             finish {ambient 0.4 diffuse 0.3 specular 0.2 roughness 0.01} }
> }

In some ways, POV-Ray treats triangles as if they were 3-D objects.  Everything
behind the triangle is treated as "inside" the triangle, and therefore defaults
to excluding media effects.

Try putting the keyword hollow inside the triangle object and see if it solves
the problem.

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