# Adapted from "vorticity (brain activity remix)" — original by synth-c,
# remix by zamuz (Winamp AVS / visbot.net). The original ran 3D particle
# trails through rotating vector fields at sound-driven speed (sndspd = 10).
name: vorticity
author: synth-c / zamuz (adapted)
mode: lines
blend: additive
persist: 0.92
linewidth: 1.6

[init]
n = 1200
t = 0
hue = 0

[frame]
t = t + dt * (0.4 + bass_att * 1.6)
twist = 1.2 + mid * 2.6
zoom = 0.75 + bass * 0.45
hue = hue + dt * 0.04 + beat * 0.01

[point]
arm = floor(i * 6)
fa = frac(i * 6)
d = fa
ang = arm * 1.047 + d * twist * 3.14159 + t
rad = (0.06 + d * d * 1.1) * zoom
x = sin(ang) * rad / aspect
y = cos(ang) * rad
red = (0.3 + 0.7 * d) * (0.35 + bass)
green = (0.3 + 0.7 * d) * (0.25 + mid)
blue = (0.3 + 0.7 * d) * (0.2 + treb + hue * 0.25)
skip = if(below(fa, 0.03), 1, 0)