Purpose
Apply a continuous tiny vertical wobble to a still illustration figure (character, mascot, object) so it feels animated even though the source is static art. Without this, illustrations feel like stickers; with it, they feel like they're breathing.
Params
{
"amplitude_px": 3,
"period_frames": 36, // ~1.2s at 30fps
"axis": "vertical", // vertical | horizontal | both
"wave_kind": "sine",
"always_on": true
}
Behaviour
Apply transform: translateY(<amplitude * sin(2π * frame / period)>) continuously from scene start to scene end. No start delay needed — the figure should be alive from frame 1.
Style pack overrides
- SP-G (riso-illustration) — default for every figure/character.
- SP-B (pinterest) — occasional on illustrated doodles.
Quality Checks
- Amplitude small (≤4px). More looks like the figure is bouncing.
- Period ≥30 frames. Faster reads as nervous.
- Vertical axis primary (illustrations breathe vertically, like a person).
Failure Modes
- Figure bounces too much. Amplitude too high.
- Figure feels nervous. Period too fast.
- Figure feels dead. Period > 90 frames; or amplitude is 0.