Introduction - If you have any usage issues, please Google them yourself
he 1 draw with light effects
2 scene contains 3 teapot, through the keyboard 123 can be respectively selected three teapot, then using the mouse to rotate each teapot separately
3 using a point light source, light source is white, with white sphere representation
4 using 3 different point light source
I light source 1 coordinate setting in the world coordinate system, and around three teapot center circular motion
II light source 2 coordinate setting during the observation coordinate system, not to change
III light source 3 coordinate setting in the teapot 1 object coordinate system, when the teapot 1 was selected rotates, light source 3 to follow the teapot 1 do the same rotation