====== Phong Material (TGorillaPhongMaterialSource) ======


The **TGorillaPhongMaterialSource** is inherited from the TGorillaDefaultMaterialSource and supports multiple light sources and the phong shading model.

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Phong shading refers to an interpolation technique for surface shading in 3D computer graphics. It is also called Phong interpolation or normal-vector interpolation shading. Specifically, it interpolates surface normals across rasterized polygons and computes pixel colors based
on the interpolated normals and a reflection model.

(https://en.wikipedia.org/wiki/Phong_shading)