摘要：
Abstract. When you finish modeling objects in the scene, you must want to use some operations to view the scene objects, such as Pan, Zoom and Rotate the scene. Pan and Zoom is easy to understand, rotate the 3D scene according to 2D point in the viewport is a little complicated. There are many methods to rotate the 3D scene, but the Arcball Controller is intuitive for the user and any viewport can be described. You can rotate your model at will just by using the mouse.
Key Words. OpenCASCADE 阅读全文
