mental ray, ma9 blah blah blah

[slipknot66]

What kind of shader are you using there? The mia material or standard?
Also, try to avoid the old arch material, as it have some problems with mental ray.

[ienrdna]

I used both standard and new mi ach material.

btw; I used gi and fg in image above

[slipknot66]

What are your FG GI settings? Also, looks like you are using an area light, what are the area light samples?

[ienrdna]

FG is at 50, mi area spot at 5 samples. It worked before.

[slipknot66]

Try to use a Photometric light, a Free Area, 32 samples, you will noticed it is faster than the spot light.
Also try FG Point Density 0,3
Rays 80
Interpolation 40
Diffuse Bounces 2
And if you are using the mia material, dont forget to use the AO in the special effects tab to Enhance the FG.

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