# Cosine roughness¶

Carbon reflective material associated with cosine roughness

The Cosine roughness model is a very simple one : the probability of a given slope is proportional to its cosine. It corresponds to a very rough surface. It is strictly equivalent to Phong roughness with the exponent parameter set to 1.

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## Ocean XML 3.0 example¶

<roughness name="roughness" type="cosine"/>