Happy holidays to everyone! Wonderful animation. If we are celebrating with Wolfram Language, I'd like to share another snowy gem created by Simon Woods in the spirit of holidays:
flake := Module[{arm},
arm = Accumulate[{{0, 0.1}}~Join~RandomReal[{-1, 1}, {5, 2}]];
arm = arm.Transpose@RotationMatrix[{arm[[-1]], {0, 1}}];
arm = arm~Join~Rest@Reverse[arm.{{-1, 0}, {0, 1}}];
Polygon[Flatten[arm.RotationMatrix[# \[Pi]/3] & /@ Range[6], 1]]];
snowfield
[flakesize_, size_, num_] :=
Module[{x = 100/flakesize},
ImageData@Image[Graphics[{White, Table[Translate[
Rotate[flake, RandomReal[{0, \[Pi]/6}]], {RandomReal[{0, x}],
RandomReal[{0, 5 x}]}], {num}]}, Background -> Black,
PlotRange -> {{0, x}, {0, 5 x}}], ImageSize -> {size, 5 size}]];
size = 300;
r = snowfield @@@ {{1, size, 500}, {1.5, size, 250}, {2, size, 50}};
Dynamic[Image[(r[[#]] = RotateRight[r[[#]], #]) & /@ {1, 2, 3};
Total[r[[All, ;; size]]]]]
The sources with some other animation is here.
