轨迹球算法，在CSGL的编程中，用于将二维坐标投射为三维坐标，实现平面鼠标拖拽改变三维物体坐标-Trackball algorithm, CSGL programming, two-dimensional coordinates for the projection of three-dimensional coordinates of the mouse drag to change the planar three-dimensional object coordinates

实现三维坐标变换的源程序，包括平移，旋转，比例变换，对称变换-The realization of the source of three-dimensional coordinate transformation, including translation, rotation, the ratio of transformation, symmetry transform

是一个实现三维定位的插件，含源码，能够根据点坐标快速定位-Is a three-dimensional positioning of the plug-in, including source code, can be based on the point coordinates of the rapid positioning