contragradient mapping

• 逆步映射

contragradient mapping的用法和样例：

例句

1. The derivative of radial curvature on the model surface is used as the second pass texture mapping coordinates, by a calculation using Euler formula.
   再通过欧拉公式计算径向曲率及其方向导数值，作为第二步映射的纹理坐标。