行星际视景仿真的视点控制研究

Research on Viewport Control in Interplanetary Visual Simulation

行星际空间的视景仿真具有:空间范围广、可视化对象描述复杂、涉及的坐标变换关系多、空间位置分布分散的特点。利用VegaPrime的树型场景构建机制、灵活的坐标系建立机制、视点控制机制和环境效果控制机制,设计了一种在虚拟广阔场景中的视点控制方法。该方法可以迅速、便捷的定位到用户想观察的位置,灵活的实现参考坐标系变换,且具有较高的通用性和实用性,经较少修改即可移植到其它可视化场景。

The varsity of space, the complex description of visual objects, the intricacy and large numbers of transformations of spatial relationship, and enormous distances among visual objects are the characteristics of interplanetary visual simulation system. A new viewport control method for virtual vast scene was proposed based on the mechanisms of Vega Prime—tree-pattern construction of scene, flexible buildup of coordinate systems and the control of viewpoint and environment effects. The proposed method can orientate user desired position conveniently and quiekly, can change reference coordinate system conveniently, has highly generality and utility, and can transplant to other visual scene with little modification.