Mottled effect/blotchs in images...

[Gorlak_cg]

Any idea whats causing this?



The 'blotchs' in the shadows and around the base of the building are what I am talking about. Both interior and exterior shots have these artifacts. The Ground is a Vray Infinite Plane. The problem occours on 'regular' surfaces too.

I am really impressed and excited about VRay for SketchUp and I have some experiance with VRay for 3DSMax. I am using Irradiance Map as Primary (Min rate. -3 Max Rate 0) and Light Cache as Secondary (Subdivs. 800) and no matter what I do I can't seem to elimate these.

I have tried these settings on two quite different machines and no luck at getting rid of them. I did have some success (altough not consistant) when upping the render settings to VERY high quality.

Any pointers in the right direction would be HUGELY appreciated!

Cheers
G

[dalomar_cg]

Re: Mottled effect/blotchs in images...

This is something I've seen on several instances with the vray infinite plane mostly. The artifacts themselves are the LC samples that have not been filtered (smoothed out)properly. I thought this was just an issue of the infinite plane not causing the LC samples to be filtered, but if its happening on other geometry too that may be an issue. Either way, I would try increasing the number of interpolation samples from 5 to 15 and see if that takes care of it.

[Gorlak_cg]

Re: Mottled effect/blotchs in images...

I did discover last night that if you Right-click, Reverse the infinite plane (so that the buff side is showing) this seems to clear it up. I will keep testing to see its whether this is consistent.

I will try and reproduce the effect I had on geometry other than the Infinite Plane.

Cheers for the quick response, much appreciated!

[dalomar_cg]

Re: Mottled effect/blotchs in images...

The back face of the infinite ground plane would seam like a possible cause of issues, so I'll run through and see what I can find as well.

[boggyplanet]

Re: Mottled effect/blotchs in images...

I had this problem too with the infinite plane by VRay. I flipped it along the blue axis so now the light colored side is showing, rendered it and it turned out OK. Smooth rendering ensued!

I'm attaching samples...

Grtz!