[Radiance-general] Radiance Transparent Mirror Material

[Greg Ward]

Hi Tom,

I'm not sure why using a mirror as its own alternate would do anything 
-- the code says it should be the same as not specifying an 
alternate....

That said, there's little point is specifying a mirror material for a 
mesh surface.  It should behave just like trans at that point -- it 
won't create any virtual sources, which is presumably why you would use 
'mirror' in the first place.  Virtual sources only get created for 
planar surface types:  'polygon' & 'ring'.  Any other surface type 
(including meshes) just get treated normally.

For a 90% reflective material with 10% transmission, the following 
'trans' should work:

void trans mirror_mat
0
0
7 .92 .92 .92 .9 0 1 1

-Greg