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请问几个DirectX的有关问题

2012-03-15 
请教几个DirectX的问题1:切线贴图就是法线贴图的意思么?如果不是,那两者有什么区别?2:The NPatch mode seg

请教几个DirectX的问题
1:切线贴图就是法线贴图的意思么?
如果不是,那两者有什么区别?

2:The NPatch mode segments 是什么意思?
原文:
The NPatch mode segments The NPatch mode segments from IDirect3DDevice9::SetNPatchMode

3:如下语句是什么意思:
The source primitive is used as a light map that scales the contents of the frame buffer to 

darken it when appropriate 

如果要看上下文,参阅下面的内容

Another application of alpha blending is to control the lighting in a 3D scene, also called 

light mapping. Setting the source blend state to D3DBLEND_ZERO and the destination blend 

state to D3DBLEND_SRCALPHA darkens a scene according to the source alpha information. The 

source primitive is used as a light map that scales the contents of the frame buffer to 

darken it when appropriate. This produces monochrome light mapping.




[解决办法]
没听说过切线贴图 只听说过法线贴图

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