[choo-chee]

When rendering interiors with bug windows - sun is lighting the floor and the reflected light causes "spots" on the ceiling - that will not clear even at SL 19.
Is there a way to avoid this ?

[Bubbaloo]

Yes, set the sun's attenuation type from inverse to inverse square, and then set the.... oh no, never mind this is an unbiased engine. I would check the reflectivity of the floor material that may be causing unrealistic results.

Can you post a render to show the problem?

[Mihai]

Try also setting the Reflected caustics in the render options to Indirect, or None and see if that helps.

[zdeno]

roughness > 2.0

[choo-chee]

thanx' I've already tried disabling caustics and hiding the ceiling from GI but it keep coming back...



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[Bubbaloo]

I would check the reflectivity of the floor material that may be causing unrealistic results.

[Fernando Tella]

The floor is bumpy, that won't produce a clean caustic in reality neither.

[choo-chee]

I know that it's "correct" but it's ruining my renders... never clears !

[Mihai]

I think first you need to lower the intensity of the emitter, it seems extremely bright and this makes it so noise will be "extra visible" in your renders. Use normal emitter values and not hundreds of thousands of watts if it's the case here.

Have you tried rendering with reflected caustics set to indirect? Or none?

[choo-chee]

I always render with physical sun since it's the most real result - and emitters with high values cause even more noise...

[Mihai]

What I mean is, don't set your emitters to values so they will have more or less the same light influence as the Physical Sky....what are your emitter settings for the inset emitter along the ceiling?

[eric nixon]

I always render with physical sun since it's the most real result

For interiors a 'sun' emitter placed about 300 hundred meters away, is easier to render than physical sun (which is just one super-bright 'pixel', I think. and it doesnt show up in reflections convincingly either)... if you use a hdri with intense sunlight that is also quicker, but I would try the emitter first. (for the emitter I'd use a 2m square with circular clip-map)

[choo-chee]

I'll try that, my emiiter-for-sun tests where smaller emitter, super-bright, about 50 meters away..