CGTalk - transparency maps in mental ray?

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Inker123

11-17-2006, 01:20 AM

For some reason, as soon as I switch my render to Mental Ray, my transparency maps cease to work. What is supposed to be transparent becomes white. It works just fine in a software render. I could just do a luma-key in comp, but it wouldn't be as good than if I could fix this issue. Is there an option that I'm missing to enable transparency maps to work in mental ray?

Inker123

11-17-2006, 01:52 AM

Here's an example:

software:

http://img166.imageshack.us/img166/6564/leavessoftxd4.jpg

mental ray:

http://img166.imageshack.us/img166/9012/leavesmrgp3.jpg

MaNdRaK18

11-17-2006, 04:48 AM

What shader are You using?

Inker123

11-17-2006, 05:43 AM

It's just a plain old lambert with a color map, transparency map, and bump map. I havent had a chance to tweak anything because I want to get rid of this problem first.

inkblack

11-17-2006, 07:18 AM

What file format are you using? Some formats give troubles....

Mathijs

Inker123

11-17-2006, 07:19 AM

I seem to have fixed it. I was using just a basic sphere with a bright gray to illuminate my scene, and I had to turn off "visible in transparency" under the sphere's mental ray attributes.

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11-17-2006, 07:19 AM

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