Wiggle One Axis

Classic wiggle locked to a single axis — the other axis stays exactly where you put it.

Expression Code

// Wiggle One Axis
// Apply to Position

freq = 2;   // Wiggles per second
amp = 30;   // Wiggle amount in pixels
axis = 0;   // 0 = wiggle X only, 1 = wiggle Y only

seedRandom(index, true);
w = wiggle(freq, amp);

if (value.length == 3) {
  if (axis == 0) {
    [w[0], value[1], value[2]];
  } else {
    [value[0], w[1], value[2]];
  }
} else {
  if (axis == 0) {
    [w[0], value[1]];
  } else {
    [value[0], w[1]];
  }
}

Apply to Position with Separate Dimensions turned OFF (if Position shows as separate X/Y properties, right-click it and untick Separate Dimensions — the expression errors on the split 1-D properties). Then choose the axis: 0 wiggles horizontally only, 1 vertically only. The wiggle is computed for both axes but only one is used — the other returns the untouched value, so Position keyframes on that axis still play back exactly. Duplicated layers wiggle differently thanks to the index-based seed. 3D layers work automatically — Z is passed through untouched.

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