"light" noise at 1500 passes

Support Lighting and Rendering
1

Hey Guys,

I keep getting these white speckles in my scene. I thought if I rendered 1500 passes it should be enough to get rid of any noise but this noise seems different :

http://www.pasteall.org/pic/26908

Does anyone know what I’m doing wrong here or do I simply need more passes?

Sofa by Karigar and table by Nikitron (blendswap)

Thx!!

2

Are those lights behind glass? That is a really bad idea with a path-tracing renderer. You really should be using some kind of photon-tracing algorithm for that, or at least bidirectional path tracing (although that only helps so much)

3

You mean the lamps on the wall? That’s the translucent material within cycles. Maybe I can try make that diffuse and see what is does.
Will get back to you on that!

Thanks for the reply.

P.

4

There’s negativa’s tutorial on this. See node setup for lights there

5

These artifacts are called fireflies or (with digital cams) hot pixels, they are a common artifact in path-tracers. Removing them is usually done in some post-process, google will help you when searching for these terms.
One way to deal with them is to render at double resolution, then use a tool such as “remove speckles” in photoshop or something like that and then downsample to the target resolution.

6

Thanks for the replies.

I decided to try and render a similar scene with Yafaray. So far i don’t see the artifacts showing up.
When I get home tonight I might try to change the translucent material to a diffuse material and render again with cycles. I’ll get back to you with the results :slight_smile:

Cheers!

Pieter