MR lighting artifact problems

[mclarey]

I'm somewhat new to Mental Ray and had a question about light noise in some of my images. In many of my images, little splotches of light appear at the corners or underneath geometry, etc... Specifically, I'm rendering an interior scene with little direct light (most of the scene is illuminated by gi.) The gi settings are shooting 50000 photons with a 5 radius with a max of 800 photons per sample. My final gather settings -which I thought would take care of this problem-are high: 500 samples with max radius of 1 and min radius of .1. This is a recurring problem for me. Please help.

[AJLynn]

What version of mental ray or Max is this? Can you try it with just multibounce FG instead of GI+FG?

[mclarey]

I'm using Viz 2006 with Mental Ray 3.3 which means there's no "bounce" option for the final gathering.

[Justin Hunt]

are you radius setting in Pixel or units?

 

Increase the radius and the no of photons per sample

 

JHV

[AJLynn]

That does put a damper on things, doesn't it. Like Justin said, the problem is in the photons. Hope you have a lot of memory. You're not using any mental ray materials without photon shaders, or any light sources without falloff, are you?

[John Dollus]

Can you post an image of what the scene looks like with GI only? That would help diagnose whether the FG or GI is the issue.