Search found 84 matches

by friedlinguini
Thu May 09, 2013 4:20 pm
Forum: General Development
Topic: artifacts - any idea
Replies: 15
Views: 9799

Re: artifacts - any idea

When computing indirect illumination, what happens when one of your secondary rays from a diffuse material happens to hit a light source? Is it possible that you are doubling up on your direct illumination? One quick experiment might be to double the intensity of your light source, omit direct illum...
by friedlinguini
Wed May 08, 2013 12:46 pm
Forum: General Development
Topic: artifacts - any idea
Replies: 15
Views: 9799

Re: artifacts - any idea

Offhand it looks like your LSE (possibly LS(S|D)*E) paths are broken. How are you calculating direct lighting on specular surfaces? If you're doing explicit connections to the light source (e.g., picking a point on the source, casting a shadow ray, and evaluating the BSDF), then the specular compone...
by friedlinguini
Thu May 02, 2013 4:41 pm
Forum: General Development
Topic: emitted importance function
Replies: 4
Views: 4010

Re: emitted importance function

Importance is a necessity for any renderer that traces more than one bounce after tracing a ray from the camera. For example, in a simple path tracer, the "weight" of an eye subpath is accumulated importance divided by the accumulated pdf. At each bounce, the importance is reduced by the B...
by friedlinguini
Wed May 01, 2013 4:38 pm
Forum: General Development
Topic: emitted importance function
Replies: 4
Views: 4010

Re: emitted importance function

Without the We term, W(x,w) would just be zero (since some nonzero portion of light hitting a reflective surface would be absorbed). Importance is basically what portion of reflected or emitted light from a surface contributes to a rendered image. In a path-/ray-tracer We(x,w) should generally only ...

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