Right now, only color is supported as an argument for LambertMaterial, PhongMaterial, etc.
More are supported; https://www.desmos.com/calculator/zgibydvrou has specular highlights (from the spotlight) that are way too bright for my taste, and PhongMaterial allows adjusting the specular multiplier. Probably more can be allowed and used.
Right now, only color is supported as an argument for LambertMaterial, PhongMaterial, etc.
More are supported; https://www.desmos.com/calculator/zgibydvrou has specular highlights (from the spotlight) that are way too bright for my taste, and PhongMaterial allows adjusting the specular multiplier. Probably more can be allowed and used.