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Re: Rendering Transparent objects onto alpha

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Steve Bentley
Re: Rendering Transparent objects onto alpha
on Dec 11, 2019 at 5:33:54 pm

The problem is for something to be transparent there has to be a background to be seen through the glass. You can have that background be "not seen by camera" with a composting tag, and it will still show up inside the glass sphere (with Index of Refraction, if you have that set) but won't show up outside the sphere or in the alpha. Reflections will also be captured in the RGB of the sphere.

You can fake a glass alpha with a fresnel effect in the transparency (or alpha) channel of a material and that can generate an alpha that gives a see through fall-off like a glass ball would but does not generate a background, a background inside the ball or the distortion from index of refraction. But you could then generate all that inside your compositor especially if all you are doing is spheres.

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