Inflation Sim

Letter

Pressure 0 Pa Thin wireframe overlay

Canvas: drag orbit · shift/right-drag pan · wheel/pinch zoom

λ_max: 1.00

Status: in range

Solve: CPU settle · WebGL film

Mesh density 3 · 4 quads across tube

Torus loads a prebaked shell (~2–4 quads across the tube at default). A/B/C keep Design-PASS bakes.

Details

Last step: —

Ladder: —

DynaPuff Bold (SIL OFL) → 5 cm hollow block shell → neo-Hookean
Pipeline: DynaPuff Bold (SIL OFL 1.1) → extrude 5 cm block → inflate
Letter height 12 cm · extrusion depth 0.05 m · h₀ 0.381 mm
μ = Pa (grill eng. · not datasheet)
Mesh: —
Hollow film shell (faces + walls · not solid brick) · denser near bends/corners/holes · opacity from local film thickness h=H₀/(λ₁λ₂)
Film: IOR 1.53 estimate · Semi-Clear White · soft industrial gloss
Same NH + wrinkle clamp + λ≥2 warn · warn stills stop at first λ≥2
Bar: design/BLOCK-LETTER-BAR.md
Public · quadmem default · bake A
Scrub: WASM SIMD lerp of a load-time Chiron pressure ladder (default ΔP=2000 Pa) · docs/PRESSURE-LADDER.md · ?live=1 forces per-step CPU settle
Extra: owned torus bake (not SVG/presets) · density swaps prebaked JSON · docs/ARBITRARY-GEOMETRY.md

Upload bake JSON (same schema as letter/torus bakes). STL/STEP remesh is the CLI path (tools/bake_quad.py --step|--stl; QuadriFlow if present), not in-browser.

Geometry limits

Single-body closed shell. Multi-body STEP/STL rejected.
Dirty STL (holes, non-manifold) fails hygiene (free≠0).
Open shells fail. Caps: ≤8000 verts, ≤12000 quads.
Tris only when needed; torus demo is all-quad.