Mysteroius Black Shape in Reflections....

[Guest mutkakokudka]

Hello everybody,

 

I ' ve encountered a strange "bug" i think with vray & 3d Max....i am using vray Sun/Sky & physical cam. Suddenly at the glass surfaces i have a black shape that come across over the part of the glass....of course there is nothing behind. Reflection map is the same Vray Sky, i have the sun set invisible. I tried to turn off Vray Sky and put different environment but no result so i guess it's not the enivronment. I also acreated a new geometry (a simple plane) and i put a different reflective material but the strange circle is still there.

I thought maybe someone here could have encountered similar problem.....

Any help is highly appreciated

Thanks

[Nic H]

its not a bug

does glass have thickness?

whats the ior?

[Stephen Thomas]

I've also had a similar problem in the past and it related to the cutoff value. Under the options tab in your material settings try lowering it from 0.01 to 0.001.

[Guest mutkakokudka]

Thank you for the answers.

I found that the problem is that i am using falloff reflections (perpendicular to viewing direction), once i switch to Fresnel is ok.

The IOR is 1.517, i tried 1.6 also, it is a glass with thickness ...do you guys know how can i prevent this with falloff (i use it often because i can control better "fresnel" effect)

I will try to lower cut off settings and i will let you know

 

thanks