一种平行透视下的三维拾取方法

A 3D picking method based on parallel perspective model

提出一种“针刺取点”的三维拾取方法 ,介绍了在平行透视模型中 ,将二维点输入设备在屏幕坐标系下得到的二维屏幕坐标 ,反算成其在物体坐标系下真实的空间三维坐标的方法及其实现。相比于 Open GL所带的拾取机制 ,本方法精度高、适用性强 ,而且容易实现。

A 3D picking method named 'meedle punctureing for points' is presented.It provides the progress and implementation of how to get the real 3D object-point at the object reference frame from the 2D screen-point inputed by 2D point input device at the screen reference frame in a parallel perspective model. Compared with the selection mechanism of OpenGL,it has the advantage on precision,extension,applicability and it is easier to implement.