Use the formula to calculate the volume of the container. 用公式計算容器的容積。
The derivative of radial curvature on the model surface is used as the second pass texture mapping coordinates, by a calculation using Euler formula. 再通過(guò)歐拉公式計算徑向曲率及其方向導數值，作為第二步映射的紋理坐標。
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