PBR uber-shader

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Example of implemented thin film interference phenomenon
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A more creative use of thin film interferece. Photoelasticity in plastics.
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Quick metals
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The project started small as a test of dispersion but it ended up as a complete physically based uber shader for Cycles. Many physical principles are involved in the shader. You can purchase it if you are stuggling with PBR in Cycles: https://blendermarket.com/products/universal-pbr-uber-shader