This is a test for exploring pyro settings in Houdini, I found it tricky to get the values work out properly for a realistic fire simulation. Fire tends to be stringy and sticky in Houdini which I dislike for most of my daily works.
My observation is that Maya produces fire and smoke simulation with the best motion, but shading, texturing and rendering a fluid object is a disaster. FumeFX produces good result but also tends to create stringy fire and smoke with unnatural turbulence patterns especially on the edge. But FumeFX has kick ass rendering tools! Houdini acts a bit like FumeFX, though much more complicated to get a good result.
So the goal of this test is to get rid of the type of stringy effect always seen in Houdini simulations. I think it's a good start.
好吧，昨天发到Vimeo上之后随手贴到这里一份。没翻译。
这个测试本来是用来探索Pyro的设置的。我发现用Houdini很难做出真实的火焰效果。因为它们总是感觉很粘，很拉丝(拉丝并不总是好的）。多数工作用到的镜头中，都还是要和写实场景合成在一起，即使你觉得那种拉丝的效果看起来很好看，可是合在背景素材中总是觉得动态差很多。
我的感觉是，Maya会算出最符合真实生活中的烟火流体效果，但是材质，贴图，灯光，渲染是个很大的难题。FumeFX则相反，效果不错，但是也是会有拉丝状很严重的烟火，并且边缘处会出现不自然的扰乱图案。但是FumeFX的渲染很好，本身就提供Multiscattering, 而且渲染很快，对于透光性很好的烟雾来说特别有用。比如云。Houdini默认情况下大体形态和FumeFX算出的差不多，只是在使用上更难。
所以这个测试的目的是要摆脱之前Houdini模拟中反复出现的拉丝粘稠状的火焰。我觉得是个不错的开始。
v001