大尺度三维复杂场景中雪动态模拟的方法

在大尺度三维复杂场景中，提出了降雪和积雪快速模拟的方法，采用视景体相关和线性分组变换的方法更新雪粒子系统，改进了降雪绘制的视觉效果。针对场景尺度大、复杂度高的特点，创建视点相关遮挡图（Occlusion Map）来精细绘制近处实体的表面积雪细节，生成积雪灰度纹理图来近似模拟远处地物的整体积雪效果，实现了大场景多细节层次积雪的动态模拟。在积雪绘制过程中，近处积雪细节模拟所需的视景体参数和遮挡图通过CPU获取，将复杂的积雪位置的判定和积雪量的计算从CPU移到GPU中，利用自定义的GPU顶点和片段操作加快了积雪模拟的速度。实验结果表明，在大尺度三维复杂场景交互式操作下，提出的方法能较好地实现雪的绘制和模拟。

Real-time snow simulation in large-scale 3D complex scenes

In large-scale 3D complex scenes,a real-time simulation method is presented for multi-level snowfall and snow cover.Aiming at the continuity,consistency and multi-level characters of large-scale weather scene,the view-dependent linear packet transform method is used to update snow particle systems,and visual effects of snowfall are improved.For the characteristics of large-scale and complex spatial features in landscapes,a view-dependent occlusion map is created to render details of snow cover on near featu...