VC6下VTK合成体绘制，在此基础上实现对相机的方位角自动漫游-VTK under VC6 synthesis volume rendering, in this based on the azimuth of the camera auto-roaming

画单位球体的以颜色为渐近的色彩图 由方位角 高程 密度等来构建-Plots the intensity (as color) of a number of points on a unit sphere. Input: azimuth (phi), in degrees elevation (theta), in degrees intensity (optional, if not provided, a green sphere is produced)