[DeathArrow]

To me snowflakes should be random and not following some trigonometric function.

[shmeano]

The trig function just varies the distribution of the random sampling to mimic temporal variations due to wind.

[maksut]

But it seems to have "rand()" calls. Also trigonometric functions can be used as a pseudo random generator (kind of): https://thebookofshaders.com/10/