Mouse shifts left and right. Space changes color. Up and down arrows change the density of the lights. Right and left arrows change the rotation of the lights. W and S change the phase shift between each strand. A and D blow the snow left and right. J hides the "joy." Happy holidays everyone!
The snow here is an all pen particle system. The tree is just two overlapping sine waves. Music: Vince Guaraldi, O Tannenbaum, from the album A Charlie Brown Christmas, 1965.
