| name | threejs-temporal-surfaces |
| description | Build screen-space temporal surface effects in Three.js. Use for full-resolution touch-history ping-pong, frost and thaw masks, reduced-resolution separable blur, static crystalline structure targets, and two-scale normal-map refraction. |
Temporal Surfaces
Use render-target state when the effect depends on history. Do not fake accumulation with a time-only procedural mask.
Pipeline
screen-space touch source
→ ping-pong state update
→ reduced-resolution scene blur
→ static structure textures
→ frost composite
→ normal/refraction output
Read references/ping-pong-accumulation.md
for an exact frost pass graph, pointer-history channels, blur and refraction
coupling, and implementation defects that must be corrected.
Read the
touch-history frost implementation for the
previous/deposit/next state transition, reduced blur, static structures,
frost-mask composition, and two-scale refraction.
Rules
- Separate persistent state from static noise and scene color.
- Preserve separate visible-mask and tilt-response channels.
- Use half-float for this history path unless a measured lower format is equivalent.
- Convert per-frame history decay to frame-rate-independent decay.
- Run the two-pass scene blur at reduced resolution.
- Pre-render static procedural textures once.
- Define and test resize/reset behavior for both history targets and static targets.
- Do not route world footprints, object-UV paint, or simulation-plane wetness here; this skill is screen-space.
Routing boundary
Use $threejs-procedural-vfx for world- or object-space residue, particles, and
dissolves. This skill owns screen-space persistent history and its composite.
