GI light problem

[Micha_cg]

Hallo,

here a GI lighting problem. I would like to know, why I have got this wrong effect. The lighting in the marked area should be dark shadowed, but it is bright. I have used IM+LC GI. Any hint? In my gallery is the correct version with IM+QMC visible.

-Micha

quick test render version with wrong GI lighting

[flipside]

GI light problem

Please post all your settings, or the scene. The problem is not only in the selected area, it ahppens on all your faces poiting in that direction.

Did you use very low LC samples, or very big sample size?

[Micha_cg]

GI light problem

I can not find my old settings and so I have started a new test. Now it looks better. In my first example I have used a subdiv mult 0.1. Maybe this and other low parameters was the reason for the strong effect.
It's difficult to say, which version (LC or QMC) is more real. The QMC GI has used only 3 bounces and the LC seems to use much more bounces.

I will observe this effect.

[flipside]

GI light problem

Yeah LC uses infinite bounces always. But the inner surfaces shouldn't be lighter than the ones more on the outside!

0.1 for sample size is much too high, if you use screen that is. 0.01 or 0.005 is much better. That can explain the lighter areas, the samples are so big that lighting isn't correct at all.

[Micha_cg]

GI light problem

Upps ... I see ... I have forget to post my last test image with the parameters. Sorry, time to go to sleep.

[Thomas An._cg]

GI light problem

Hi Micha,

One crit: The DOF seems a little too strong.

[Micha_cg]

GI light problem

Thanks.