glass shadows in mental ray

Introduction to Maya - Modeling Fundamentals Vol 1

This course will look at the fundamentals of modeling in Maya with an emphasis on creating good topology. We'll look at what makes a good model in Maya and why objects are modeled in the way they are.

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# 1 29-10-2003 , 09:40 AM

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Location: Tampa, Fl.

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is there a trick to get a glass object like a window to stop casting opaque shadows when using mental ray? I have made the glass transparent but it always casts an opaque black shadow. What might I be doing wrong? Im attaching an example.

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# 2 29-10-2003 , 03:48 PM

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makes sure all of your lights are using Ray Traced shadows. D map shadows wont work.

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# 3 29-10-2003 , 06:16 PM

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in that image above raytrace shadows is turned on. I checked the spotlight and its ray trace attribute is on. Im lost. What else could it be?

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# 4 29-10-2003 , 06:31 PM

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can you post a bigger image of the trouble spot? i think i know whats wrong.

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# 5 29-10-2003 , 11:47 PM

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heres a closer shot.

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# 6 30-10-2003 , 02:51 AM

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yeah. i think i know why, with the galss at an angle it diffuses more light. this is whats causing the dark shadow. try not shining your primary light from straight above.

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# 7 30-10-2003 , 03:55 AM

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hmmm... Ill give it a shot....

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# 8 30-10-2003 , 12:59 PM

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nice model...poly?

grrrr

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# 9 30-10-2003 , 07:40 PM

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all polys.. There are some more recent shots in WIP forum. Thanks for the compliment. BTW... I havnt rerendered the model since iron tick mentioned the shadow thing but I looked again at some of my renders and as the window bends around in the front the shadow does appear to be working correctly. Ill give it a try later and see for sure. thanks again.

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