网格的切线。
切线最常用于凹凸贴图着色器中。切线是单位长度的矢量,它顺着网格
表面沿水平 (U) 纹理方向。Unity 中的切线表示为 Vector4,
其“x,y,z”分量定义矢量,而 w
用于在需要时翻转副法线。
Unity 计算另一个表面矢量(副法线)的方法是获取法线与切线
之间的叉积,然后将结果乘以切线的 w。因此,w
应始终为 1 或 -1。
如果计划在网格上使用凹凸贴图着色器,则应自己计算切线。
在分配 normals 或使用 RecalculateNormals 之后分配切线。
Note: To make changes to the tangents, it is important to
copy the tangents from the Mesh. Once the tangents have been copied and
changed, the tangents can be reassigned back to the Mesh.
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