Is it possible to have an object be trasparent depending on the 
relationship of another object?

Here's what I want to happen:

Object A is surround by Object B -- such as a sphere inside another 
sphere. I want Object B to be transparent only in the areas that 
obscure Object A from the camera's position. So, you would see Object A 
through Object B but to the left/right/top/bottom of Object A, Object B 
would have no transparency (or it the transparency would trail off).

Does that make sense? Is there a way to do it in POV-Ray?

Thanks,

	Sean

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