Introduction - If you have any usage issues, please Google them yourself
(1) the use of multiple light sources (2) scene requires a bit light source, light source position the infinity light source as well as the direction of the light source (3), properties (4) to set the object material properties, including: ambient light, diffuse reflectance and specular reflectance ( 5) as far as possible in the scene can be observed the presence of different types of light sources