measure by thickness

Development Rendering
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1

Hi . there is any node for materials can measure the thickness of objects by their thickness base on camera angle?

Thanks .

2

Usually only camera direction vector used for this. So in simple case you can make Dot(SurfaceNormal, CameraDirectionVector).

3

Probably not. Why do you need to measure its thinkness?

4

I want to try creat glass material with have some fog effect in it.
http://cienel.net/images/tutorial-images/44/06.jpg