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Is there some way to have an object completely invisible in the main render, yet still have it show up in the alpha channel? It seems that when add vrayobjectproperties and turn off primary visibility, it also turns off all the alpha contribution. I'd like to have the primary visibility off and the alpha contribution on. Thanks.
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This is not possible out of the box with VRayObject Properties or anything like that.
If the object is excluded from the Primary visibility somehow it will be excluded from alpha as well.
There are several ways to achieve what you after, here are two of them.
1.Make the object 100% Refractive and IOR=1, the object will be practically invisible and its alpha will be still there.
2.Make the Opacity Value of the material something very very low like 0.001 and use some of the render elements like RenderID,ObjectID,ObjectSelect etc.
Here is a tests scene with examples for the both approaches I mentioned above:
http://ftp.chaosgroup.com/support/sc...ble_objects.mb -
This will work, thanks.Comment
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