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[GPUGems1] Occlusion Culling

2010-04-19 00:18:01| 分类： 3d | 标签： |举报 |字号大中小订阅

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看看 GPU Gems1 中的文章，也是 03,04 年主流显卡支持的特性，对于网游，也许，还没用上。呵呵。

Occlusion Culling

http://http.developer.nvidia.com/GPUGems/gpugems_ch29.html

原理很简单，就是在可视范围内(view frustum)，物体A被物体B完全遮挡，则可以不绘制物体A。

哪些物体被遮挡了呢，可以通过 occlusion query 得知。

是否使用 occlusion culling，取决于算法本身能否带来更高的效率。比如：被遮挡的小物体很多，则丢给显卡绘制这些小物体的开销，高于 query 开销。

在 DX9 中可以通过 IDirect3DQuery9 来实现 occlusion query。

http://www.gamedev.net/reference/programming/features/occlusionculling/

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