Dark spots on rendering

[nhilton]

I'm new to Vray on Rhino and am having difficulty with a simple rendering which is showing dark spots on the wall, floor and ceiling surfaces:

http://i1013.photobucket.com/albums/...testlight3.jpg

Any ideas how to solve this problem? ???

[fooprobe]

Re: Dark spots on rendering

your irradiance map (or light cache) settings are too low. post them if you need help adjusting them. here's a writeup on IRmap:

http://www.lookinglass.us/vray4rhino...ce+Map+Quality

[Micha_cg]

Re: Dark spots on rendering

I would be careful with the samples, that makes the GI solution blurry. At the tutorial forum -> starterkit you will find some hints too. I wouldn't touch the (interpolation) samples to much and increase the IM subdivs only. My typical values are approx.:

subdiv samples
30 20
90 20
120 30
180 40

[fpedrogo]

Re: Dark spots on rendering

I'm 100% agree with Micha. If you increase the samples to much you are going to blurry the GI solution and lose details.

[fooprobe]

Re: Dark spots on rendering

interesting. i never noticed a problem with increasing samples - unless Hsph Subdivs was not also being increased. but i almost never use values over 100 for samples. since it's not part of the IM pass i often tweak it in a separate pass, but i've not tried using really high subdivs with lower samples, i'll check it out. thanks for the tip...