Lambertian diffuse term
Cook-Torrence: only specular term with metallic = 1.0f and roughness = 0.5
Microfacet material model: GGX NDF, Smiths shadowing masking term, Fresnel term with schlicks approximation
Blinn material with default light intensity values
Phong material with default light intensity values
Cook torrence: specular term, incorrect Gamma correction added gamma correction to already srgb color values