Global illumination problem

[highend]

Hi everybody,
I use mental ray renderer for a long time, and I always have problem with global illumination ; highlights on corner. I change my scene'scale, and try settings of GI, number of photons but can't resolve this. are this depends of geometry or using of mental ray's custom light or what ?

[bart]

What exactly to you mean by 'highlights on corner'?

Is this an inside, or outside corner of an object?

Where is the light coming from?

[Lolly]

“highlights on corner”

macula?stain? Maybe any litter photon collect on a place.
you can:
1.increase the parameter "Global Illum Radius" in Render Global Settings,
2.enable "Final gather",to smooth them.