Remco de Korte wrote in message <37B29014.E5722D1A@xs4all.nl>...
>I've never really used manual bounding (not in POV) but as I understand it
it
>can have advantages. I'm wondering if it can help me here:
>I have a series of planes with a hole cut out lined up in front of each
other so
>the camera looks through the holes. This is quite slow to render. Is there
a way
>to speed it up with bounding?
>I know part of the reason why it it slow is in the light_sources I use.
>I need them to get a flat light. I didn't want the planes to cast shadows
on
>each other. Obviously this was before I knew of the no_shadow keyword 8-]
>Here is the code:


>light_source{<-20,20,-.9> color rgb .4}
>light_source{<20,20,-.9> color rgb .3 shadowless}
>light_source{<-20,-20,-.9> color rgb .2 shadowless}
>light_source{<20,-20,-.9> color rgb .1 shadowless}
>light_source{<-20,20,5> color rgb .2 shadowless}
>light_source{<20,20,5> color rgb .15 shadowless}
>light_source{<-20,-20,5> color rgb .1 shadowless}
>light_source{<20,-20,5> color rgb .05 shadowless}


One significant speedup would be to reduce the number of light sources, as
each ray from the camera that hits a plane will get checked against each of
these lights to determine the color contribution from the lights.

>light_source{0*x color rgb 2.5
>  area_light  <8, 0, 0> <0, 8,0>
>  10, 10 jitter adaptive 3 translate <0,0,-20>}


This is another major slowdown, as it is the equivalent of up to 100 light
sources.

Mark

Post a reply to this message