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扫描边的问题 #1

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feixiaku opened this issue Dec 8, 2017 · 2 comments
Open

扫描边的问题 #1

feixiaku opened this issue Dec 8, 2017 · 2 comments

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@feixiaku
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feixiaku commented Dec 8, 2017

hi，在描边的vertex shader中，关于normal的空间转换是不是不太正规？
normal 先转到view space，normal_ViewSpace = mul((float3x3) UNITY_MATRIX_IT_MV, i.normal),然后再转到clip space, normal = mul((float3x3) UNITY_MATRIX_P, normal_ViewSpace).

我的理解：normal在使用UNTIY_MATRIX_MVP转换之后的结果，有可能和world space中normal的方向不一致
@chenjd
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chenjd commented Dec 12, 2017

hi feixiaku.
其实关心的是clip space内的坐标，而非world space。

@feixiaku
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是呀，但是UNITY_MATRIX_MVP和(UNITY_MATRIX_IT_MV然后在与UNITY_MATRIX_P相乘)这两个矩阵是有可能不一样的，所以normal与两个不同的矩阵相乘结果也应该不一样的吧

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@chenjd @feixiaku