White Spots

[siggi40]

I am using Rhino v4 evaluation with VRay Core 1.49.84.
There are white spots (points) on some places of my renders. How can i solve this issue ? Or what causes this ?

[dalomar_cg]

Re: White Spots

So for some reason I couldn't see the image you posted on the other thread, but now I can. So below is my original suggestion, but thats not really what is the going on (I figured I'd keep it in, just in case someone finds it useful, but that is not your issue). So you're using QMC for primary bounces, and basically those pixels are very bright because they sampled alot of rays from a very bright place (like a light, emitter, or GI). Although adding more samples will smooth the result out, it will also help to use higher antialiasing settings. Using adaptive QMC 1/24 should be a good starting point.

Unfortunately this will make your rendering take longer. If you'd like you can change your primary bounces from QMC to Irradiance Mapping. That will almost certainly make all of those white spots go away, and probably render faster as well


Original Post:
You should be able to get rid of the light spots by disabling GI refractive caustics. In V-ray Options go to the Indirect illumination rollout. In the middle at the top will be two check boxes; one for Reflection Caustics, and one for refraction caustics. The reflection caustics should already be disabled, so just disable refractive Caustics

[joe_b]

Re: White Spots

split topic out of bug list

[Micha_cg]

Re: White Spots

Do you use a HDRI? Once I have seen spots with a HDRI that has some wrong pixels (extrem black or white - in your case it could be extrem white). HDRI test - open it in HDRShop and change the exposure. At a very low/high exposure your bad pixels should be visible.

[dalomar_cg]

Re: White Spots

Or blur the HDR abit, but only the hdr used for lighting. Not only will that help the white pixels, but also prevent splotchyness.