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Old 25-07-2007, 10:05 PM   #1
MrSandman
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Default Rendering shadow/reflection but not the plane itself

Ok. So I have an object that's lying on a plane, casting a nice shadow - or creating a nice reflection. I want to use the finished image on the web.

But, we have a catch 22 here. In order for Maya to render a shadow or a reflection, it needs to render the entire plane beneath the object, meaning that there won't be an alpha channel, meaning that I can't use the resulting image on any background.

So, how do I render only the shadow/reflection on a surface and not the surface itself? Can it even be done? I want the shadow to be a part of the alpha channel, so it can be used on any background. Ditto for a reflection.

Is it possible?
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Old 25-07-2007, 10:36 PM   #2
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Dont thinnk you can for refelctions, I usualy do a refelction pass sepperate with all objects set to 100% refelctive, each object on a sepperate layer and then render and compsisite.

You should have an option to render just the shadows in the render layers options.
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Old 25-07-2007, 11:35 PM   #3
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Last edited by Weyu : 26-07-2007 at 05:06 AM.
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Old 26-07-2007, 12:25 AM   #4
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Use the backgroundshader
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Old 26-07-2007, 03:33 AM   #5
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or just check off primary visibility in the render options of the object.

i think that will work
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