And now, we're going to try to find the volume of that spherical cap again but using spherical coordinates instead.
现在来求下被切出的球冠的体积，我们用球坐标来求。
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Although the particles are animating (moving away from the source), added detail is gained by animating the texture coordinates used to calculate the lookup in the the noise volume texture.
The N-S equations were discretized by the finite volume method in body-fitted coordinates and the coupling of pressure and velocity was implemented with the compressible form of SIMPLE algorithm.