Help needed problem with material & noise

[askhamdesign]

Hi All

Im having a problem with a certain object a tire which was not made by myself.

Its comming up with noise on the object no matter what mat I use on it.

Feel free to take a look at the scene and help me out Im sure its somthing really stupid that im missin!



http://www.supercreative.co.uk/vray/tire.max

Its max 6 Vray 1.46.13

Thanks for your help.

Simon

[percydaman]

set your Raytracing Seconday Ray Bias to .001 and all renders fine.

[percydaman]

even better would be to use a shell modifer, as the ray bias fix causes some different image errors.

[askhamdesign]

So whats causing the prob percydaman?

[askhamdesign]

Prob solved anyway cheers percydaman

[askhamdesign]

Hi percydaman

How do I need to use the shell mod to solve this?

Thanks

Si

[Dynedain]

if raybias is fixing it, it sounds like you have coplanar faces

[askhamdesign]

Hi Dynedain

Whats that mean faces on top of each other?

Si

[Dynedain]

it means having two faces that exist in the exact same location

so when it comes time to render, the computer gets confused as to which it should be displaying

[askhamdesign]

Thats as I thought I will take a look at the model.

Thanks

[PixelJockey]

Coplanar faces appears to be the problem indeed. If you edit the mesh you can delete one face and there is another right behind. It might be worth your time to clean out the extra faces from one band of the tire and then do a circular array to make a new tire.

[askhamdesign]

Yep your right PixelJockey some or most faces are doubled up which causes the problem.


So its down to the crap model not a V-ray prob, "not produced by me I must add"

Thanks

Guys