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补充说明：就是bump下，显示不出来凹凸纹理，而displacement下显示过暗，在bump中，我的dU实现如下：
dU = kh * kn * (payload.texture->getColor(payload.tex_coords[0]+1/payload.texture->width,payload.tex_coords[1]).norm()-payload.texture->getColor(payload.tex_coords[0],payload.tex_coords[1]).norm());-
请将代码发到 lgz17@mails.tsinghua.edu.cn，我尽力帮忙看看。
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请将代码发到 lgz17@mails.tsinghua.edu.cn，我尽力帮忙看看。
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请将代码发到 lgz17@mails.tsinghua.edu.cn，我尽力帮忙看看。
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