海面上的水花的特效&＃xff0c;水花是在浪尖处发射出来的&＃xff0c;目前还没有让发射参数自动化的方法&＃xff0c;都是表达式。一旦改变浪的性质&＃xff0c;发射的粒子就要重新写动态了。
Splash on the ocean emitted from the crisp faces on top of the wave, the whitecap, all controlled with expressions. I don&＃39;t have an automated emission parameter function, once the type of the wave changes, the expression should be re-write.
第二个其实开始是要模拟一下2012大母舰被冲上陆地的镜头&＃xff0c;特写。不过这个想法因为时间关系就停在了开始&＃xff0c;发现几个问题&＃xff1a;
Here&＃39;s some issues:
1.Maya粒子模拟&＃xff0c;即使是用无网格流体SPH来计算&＃xff0c;可能数量大一点没关系&＃xff0c;不会崩溃。可是Mesh的过程就杯具了&＃xff0c;只要分辨率和粒子数量达到一定的高度&＃xff0c;Maya果断crash&＃xff01; Maya can handle large amount of SPH particle simulation, though slow, but the mesh process is a disaster, once the resolution or particle counts goes up to a certain amount, maya crashes immediately.
2.Mesh的机制很不好&＃xff0c;有resolution限制&＃xff0c;这个限制会导致即使在Maya不崩溃的情况下也会出现模型抖动的情况。Maya has some issues with the mesh tool, resolution restriction will cause mesh jittering all along.
3.构造历史过多会导致问题更加严重&＃xff0c;在流体模拟这种课题上&＃xff0c;如果没有历史的帮助&＃xff0c;整个模拟的效率会大打折扣&＃xff0c;而且有些效果成为不可能。Construction history cause problems when there are a lot of them, but they are important for fluid sim, some effects will be impossible to do.
4.Maya的SPH计算的结果并不好&＃xff0c;压力不够&＃xff0c;张力不够&＃xff0c;能量传递有时候有问题&＃xff0c;像我同事所说的&＃xff0c;可能Maya粒子流体只适合模拟大鼻涕一样的东西。SPH in Maya doesn&＃39;t work well enough, problematic pressure, tension, energy conservation, transferring.
5.再次希望&＃xff0c;Maya能够推出多质量的网格流体模拟。现在的流体都是气态的&＃xff0c;或者模拟两种质量相近的流体。而气体/液体这种&＃xff0c;才是我们迫切需要的&＃xff0c;毕竟大规模流体我们不能用SPH。(Houdini 11有了自己的FLIP Solver&＃xff0c;Realflow 5有了Hybrido混合解算器&＃xff0c;Maya估计也快了吧) Hope that maya will have multiple mass grid fluid simulation. For now all simulation are gaseous, all 2 same mass kinds of fluids. Gas/Fluid is what we need the most, we can&＃39;t use SPH for large scale sims after all.
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