视点相关的真实感三维风景区模拟研究与实现

View-depended Realistic 3D Landscape Rendering and Realization

提出采用八叉树组织真实山体数据,根据视点距离采用不同的细节层次LOD表示山体各部分,并结合视觉剪裁和帧间相关性进一步减少绘制的山体,达到加速三维地形的绘制和漫游的目的。使用混合纹理映射、阴影渲染技术,并加入山谷中的水面模拟,生成具有真实感的大规模三维风景场景。实验结果表明该方法有效地减少了算法复杂度,易实现碰撞检测,大大提高了绘制效率,在PC机上能实时地生成高分辨率、具有真实感的场景,完全满足VR交互要求。

This paper put forward to use octree to organize terrain data. Using different LOD models to represented terrain＇ s parts which depends on the distance about view＇ s position with octree node. In order to accelerate speed of rambling , the technique of frustum culling, the relativity of frames also be used to reduce rendering triangles. Combining with multi-texture, shadow techniques and the simulation of water, generated a realistic 3D landscape scene. The experiment proved that this method can effectively reduce the complexity, and very. easy to realize CD（Collision Detection）. The terrain scene has been successfully implemented for approximating and rendering digital terrain models and other height fields, and consistently performs at interactive frames rates with high image quality in PC platform.