We have something special for the upcoming holiday season for you: Snowflakes! This was the very first paper I ever implemented in Houdini – what a feeling! I recorded it a while back in summer but then decided to wait until the right season. As the first snow is hitting the Munich area I guess it is about time to release the tutorial.

The technique stems from Cliff Reiter’s brilliant paper called “A local cellular model for snow crystal growth”. Don’t fret – We’ll do our best and explain what’s actually going on here. In essence it is a rather straightforward yet extremely efficient (and quite clever) cellular automaton we’re building. Hope we didn’t scare you with that previous sentence. Relax – all we’re doing is to simulate small particles of water that are allowed to move in a hex-grid. Enough talk, let’s build it.


这个技术源于“A local cellular model for snow crystal growth”,不要害怕,我会尽最大努力解释它。在本质上,它是一个相当直接,但非常高效(和非常聪明)的生成方式。放轻松,很简单,从模拟一个小小的水粒子在六角网格上游动开始。让我们实现它!



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