With one Position pin and no Bend pins, every rotation and scale about the
pin is free in the ARAP energy. The 1e-9 regulariser (about 1e-12 after the
edge-length scaling) is too weak to hold them, so the CG solve turned
round-off into a visible rotation of several pixels, depending on where the
pin landed. The exact solution is the rest mesh translated by the pin's
offset, so deform() returns it directly in that case.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Paint: non-destructive Paint effect with Brush/Clone/Eraser stroke groups
(Path, Stroke Options, Transform, Duration spans, Write On End keys),
dab rasterizer (diameter/angle/roundness/hardness/spacing/flow/opacity,
pressure dynamics, modes, channels), eraser modes, clone from layer/time,
cache keys include visible strokes. paint.stroke/options/brushPreset/
setCloneSource/removeStroke/presets. Layer panel with paint tools, Paint
and Brushes panels.
Puppet: Puppet effect with meshes and Position/Advanced/Bend/Starch/Overlap
pins; alpha contour -> expansion (exact EDT) -> simplified outline ->
Delaunay with constraint recovery; ARAP (Igarashi 2005) two-step solve with
CG; anti-aliased texture-mapped rendering with overlap depth. puppet.addPin/
movePin/setPin/removePin/mesh/info. Puppet tools in the viewer with mesh
overlay and header options.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
