对于GIS的同学来说，很多人都学过opengl，现在上传一个自己做的东西，希望有用

EWDraw 3D is a powerful vector graphics ActiveX for 3D and 2D visualisation and animation. You can use it for CAD,CAM,GIS and others. The EWDraw is based on Open CASCADE geometric kernel and openGL. The component is realized as a run-time Windows 3