black dots using scanline/raytrace

[Bugga_Guy]

Has anyone ever encountered strange black dots when using raytrace? I made sure there is no co-planar faces, - I am just using standard scanline renderer. The black dots flicker and move on the raytraced surface in a animation sequence of frames, it disapears when I turn raytrace off.

 

The scene uses about 15 rpcs, several speedtree model trees and it is a quite large scene.

 

I never seen this before, any ideas? I would appreciate any help with this.

[jvlive]

i've had that before. cant remember exactly what the cause was. maybe you can try increasing your raytrace depth? do you have lights with negative shadows or shadow values >1? i think either negative or 1.+ shadows cause black spots on reflections. not sure bout speedtree and rpc though.

[alexthg]

I've got that one too.

Turns out that one of my textured object is not UVW-mapped. Funny thing is, 3dmax renderer didn't tell me that one of my object are missing UVW map.

 

I had to check EVERY objects in the scene just to find the culprit.

 

Regards

HarryG

[Bugga_Guy]

Thanks for the help, seems there are many different issues that can cause it, however - I think I just figured it out.. I had 4 different types of lens effect glow. When I turned them off no black dots on raytraced surfaces..

 

Very odd. I guess I have to do the glows in post