SynthTime

Drive three different noise fields off the same clock and they will move together. Not obviously — but they start at the same phase, and they hit their peaks and troughs at correlated moments. The scene ends up pulsing on one dumb metronome instead of feeling alive.

The fix is to give each channel its own offset into the noise, far enough apart that they never correlate.

function SynthTime() {
    this.x = Math.random() * 10000;
    this.y = Math.random() * 10000;
    this.z = Math.random() * 10000;
}

That’s the whole thing. Three big random numbers, generated once. The magnitude is the point — at small offsets, smooth noise is still correlated with itself, so you need to land somewhere genuinely unrelated in the field.

Usage

Make one at load, add its components to whatever clocks you send across:

var st;

function setup() {
    st = new SynthTime();
}

function update(dt) {
    setUniform('t_hue',   TIME * 0.10 + st.x);
    setUniform('t_warp',  TIME * 0.35 + st.y);
    setUniform('t_bloom', TIME * 0.02 + st.z);
}

Then in main.glsl each of those feeds its own noise lookup, and the three decorrelate:

float hue   = _noise(vec2(t_hue,   0.0));
float warp  = _noise(vec2(t_warp,  0.0));
float bloom = _noise(vec2(t_bloom, 0.0));

Notes

• Generate it in setup(), not update(). A new offset every frame is just white noise — the point is a fixed random phase that then advances smoothly.
• Because it’s re-rolled each time the scene loads, the same scene looks subtly different every session. That’s usually a feature; if you need it reproducible, hardcode the three numbers once you find a set you like.
• 10000 is arbitrary but wants to stay large. A few units of offset isn’t enough to escape the correlation you’re trying to break.
• Same trick applies to per-instance offsets in a loop — seed each copy of a repeated element with its own offset and a rigid grid starts to breathe.
• Nothing about this is limited to three channels; it’s a vec3 because that’s the shape that usually goes across. Add fields as you need them.