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[Feature Request]顶点法线的调整 #4

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iceprincefounder opened this issue Nov 13, 2017 · 0 comments

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iceprincefounder commented Nov 13, 2017 •

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顶点法线的调整
顶点法线就是顶点的方向。3D图像中的光照计算需要光源的方向，视线的方向，面的朝向(法线方向)三个参数。也就是会通过法线方向的调整，控制阴影的外观。

《罪恶工具：X标记》的角色模型有4万面。如果什么都不做，模型会产生复杂的阴影。不过开发者想要的是赛璐璐动画那样大片，概括的阴影。所以在维持3D模型精度的同时，将多边形的方向信息进行调整，扩大光照产生的阴影。

比如把脸颊附近的法线调整到和鬓角处接近，在鬓角变暗的时候，脸颊附近也会变暗。通过法线调整实现了让高精度模型拥有低精度模型的概括阴影。

这里的实现方法是给syToons增加一个法线贴图的选项，使用连入的额外的法线贴图，改变顶点的法线。

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