Those interested in physics-based simulation of snowflake growth should have a look at this page [1] with papers describing models to do so, in particular part II describes a two-dimensional model, part III a three-dimensional model. There also many rendered images and a couple of videos of the simulation results and even some code.<p>A lot of information can also be found on Kenneth G. Libbrecht's snowcrystals.com [2] including many snowflake photographs. Also the photographs of Alexey Kljatov [3] are quite well known.<p>[1] <a href="http://psoup.math.wisc.edu/Snowfakes.htm" rel="nofollow">http://psoup.math.wisc.edu/Snowfakes.htm</a><p>[2] <a href="http://snowcrystals.com" rel="nofollow">http://snowcrystals.com</a><p>[3] <a href="https://alexey-kljatov.pixels.com" rel="nofollow">https://alexey-kljatov.pixels.com</a>