BSDF reverse tracing
1998
1
0
-
- jerry7
- Member
- 663 posts
- Joined: 11月 2013
- Offline
hi,
In this document,
http://www.sidefx.com/docs/houdini13.0/render/bsdf [
sidefx.com]
3.For each secondary ray, Mantra uses a 3D tree search algorithm to find the surface or light nearest to the angle computed by the BSDF
Why does calc only one nearest light ？Do NOT all lights contribute energy to the sample point ?
Thanks!
-
- symek
- Member
- 1390 posts
- Joined: 7月 2005
- Offline
jerry7
Do NOT all lights contribute energy to the sample point ?
That's why Mantra performs this process several times each time sending a ray in different direction based on probability expressed by that bsdf.