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Old 29-10-2003, 08:40 AM   #1
jstarr976
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Default glass shadows in mental ray

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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Old 29-10-2003, 02:48 PM   #2
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makes sure all of your lights are using Ray Traced shadows. D map shadows wont work.
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Old 29-10-2003, 05:16 PM   #3
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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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Old 29-10-2003, 05:31 PM   #4
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can you post a bigger image of the trouble spot? i think i know whats wrong.
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Old 29-10-2003, 10:47 PM   #5
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heres a closer shot.
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Old 30-10-2003, 01:51 AM   #6
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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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Old 30-10-2003, 02:55 AM   #7
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hmmm... Ill give it a shot....
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Old 30-10-2003, 11:59 AM   #8
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nice model...poly?
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Old 30-10-2003, 06:40 PM   #9
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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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