Introduction - If you have any usage issues, please Google them yourself
ee ~ 5-OpenGL viewpoint coordinate and world coordinate system corresponding relationship between each other and establish a reference point as the center point of view series of spherical coordinates, a new algorithm for three-dimensional scene rotation model. Geometric meaning of the model is very clear, at any time in the process can drag to adjust the sensitivity, the same three-dimensional rotating conditions, changes in lead vector remains constant, convenient operation and easy, three-dimensional rotation operator for the machine provides a new effective way.