[Radiance-general] Slow rendering with transparant textures

[iebele]

Hi all,

I have a model with about 40.000 polygons, each textured with a mostly 
transparant image (only about 1% of the texture is visable). Seen from the 
rendering viewpoint the polygons in the model overlap quite a lot, so one 
ray might have to "look" through about 50 "transparant" polygons or even 
more before actually "see" something. I think this is why this particular 
model renders amazingly slow, even with -ab set to 0, -st 0 and -lr 1. Is 
there another parameter in control that might speed up the rendering in such 
case?

-Iebele



void plastic material_17999
0 0 5
0.757813 0.773438 0.753906
0.01 0.01

material_17999 colorpict colormap_17999
7 noneg noneg noneg ./D2P_0595.pic tmesh.cal u v
0
7
2
   -0.01410693     0.02148561   -19.61004639
   -0.00179046    -0.00117557     3.75267568

void mixpict transmap_17999
7 colormap_17999 void green
./a_D2P_0595.pic tmesh.cal u v
0
7
2
   -0.01410693     0.02148561   -19.61004639
   -0.00179046    -0.00117557     3.75267568

transmap_17999 polygon polygon_17999
0 0 9
634.194214 1375.645264 90.465210
655.547729 1343.122681 90.465210
1045.819336 1599.365479 90.465210