Phong Material (TGorillaPhongMaterialSource)
The TGorillaPhongMaterialSource is inherited from the TGorillaDefaultMaterialSource and supports multiple light sources and the phong shading model.
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.