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看了sdk里的shadow volume的code和doc
doc里写道:
Finally, there is another area that could call for some performance optimization. As shown earlier, the rendering algorithm with shadow volumes requires that the scene be rendered in multiple passes (one plus the number of lights in the scene, to be precise). Every time the scene is rendered, the same vertices get sent to the device and processed by the vertex shaders. This can be avoided if the application employs deferred lighting with multiple rendertargets. With this technique, the application renders the scene once and outputs a color map, a normal map, and a position map. Then, in subsequent passes, it can retrieve the values in these maps in the pixel shader and apply lighting based on the color, normal and position data it reads. The benefit of doing this is tremendous. Each vertex in the scene only has to be processed once (during the first pass), and each pixel is processed exactly once in subsequent passes, thus ensuring that no overdraw happens in these passes.
而源文件没有做这一步优化,而上面提到的"the application renders the scene once and outputs a color map, a normal map, and a position map"这一步不知怎么实现,希望大家能指点小弟一下,谢谢了! |
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发表于 2005-4-5 18:18:00
楼主