Phong roughness¶
The Phong roughness model is based on the specular part of the classical Phong BRDF. The slope distribution is isotropic, and controlled by an exponent parameter. An exponent =0 corresponds to the maximum roughness, while infinity corresponds to no roughness (perfectly flat surface). For high values, exponent is equivalent to 2/α², where α is the standard deviation (RMS) of the surface slope.
Children nodes¶
exponent | The exponent shader |
Parameters¶
none
Ocean XML 3.0 example¶
<roughness name="roughness" type="phong">
<scalarshader name="exponent" type="uniform" value="12.5"/>
</roughness>