A stylized robot hand made in code, no asset: rigid pieces, each fixed to
one bone, so nothing bends or stretches out of shape. A light shell per
finger bone (a tapered box with rounded edges and ends), dark balls at the
knuckles and the thumb's base, dark hinges at the other joints, a palm of a
dark core between a palm plate and a back plate with panel lines, and a
short closed cuff past the wrist. Cyan accents glow: fingertip pads, a line
across the knuckles, a dot in the palm, a ring round the cuff. solid is
ceramic white over dark grey metal; ghost is pale and see-through.
screens/handrobot.cpp builds one mesh (2373 vertices, 4360 triangles) once,
a right hand on DemoPose's open hand, in 16 segments' frames. The frames are
handskin's rule (new handskin::TrackedFrames); a left hand's are a right
one's mirrored, so the same mesh draws it mirrored. Each vertex is fixed to
its bone's start or end: shells keep their rounded ends, the straight middle
takes up the tracked length, fingertips end at the tracked tips. The vertex
shader applies one segment's matrix per vertex; no cap pass (it's closed).
Cost (--snapshot, frame-job 4 cores, same run): robot 0.21-0.24 ms CPU and
0.55-0.57 ms GPU wait per draw, against asset 0.28/0.66, babylon 0.26/0.66,
mrtk3 0.25/0.66.
Tests: segments start at their joints along their bones, no vertex past its
bone's length, fingertips at the tracked tips, left = right mirrored vertex
for vertex, rigid segments across poses, only the middle stretches with a
longer bone, accents on the right sides.
No free robot hand asset fit; screens/assets/hands/README.md says what was
looked at.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
