Found the real cause of the leg stretching, after three wrong guesses.
720 vertices on Taila are weighted to BOTH legs at once below the knee — 262 in
the boot/cuff surface, 208 in the outline shell, 176 in the body, the worst at a
dead-even 49/51 split. A vertex pulled equally by both feet sits halfway between
them and STAYS there while the legs separate, stretching every triangle around
it. That is the band between the ankles and the elongated boot that reads as the
legs being squashed. SkinLegRepair snaps each below-knee vertex to whichever leg
already dominates it, renormalises, then drops the few triangles still spanning
the two legs (48 on Taila, 0 on Miku, which needs 214 vertices snapped).
What finally located it was reproducing the artefact through the FULL runtime
stack in a bright scene. Every previous "clean" render had bypassed the game's
animation stack — playing the clip straight off the GLB's AnimationPlayer with
no AnimationTree and no pose modifier — so it could never show the bug. With the
real stack the boot visibly stretches, and freezing the AnimationTree at the
rest pose renders it perfectly, which proves the pose is fine and the skinning
is not. Confirming measurements, all through the runtime stack during a run:
no bone's pose basis deviates from a pure rotation by more than 0.00001, no
bone's length drifts from its rest offset by more than 0.0000 m, and no
below-knee vertex is influenced by any non-leg bone. There is no squash-and-
stretch in this rig; there never was.
The two earlier attempts at this are both superseded: re-weighting by
triangle-neighbour majority (tore the cloth) and deleting cross-leg triangles
(too narrow — 24 triangles against 720 bad vertices). Hiding the model's own
outline hull, from the last commit, stays: that hull is genuinely broken and
redundant, it just was not the whole story.
Weapon support hand: gun_fore was a single constant 0.35 m for every weapon, so
on a short gun it hung the off hand out past the muzzle with nothing to hold —
that is the "not supported by the arms" case. It is now clamped to 80% of the
weapon's own grip-to-muzzle distance, which only bites on the short guns (MP7
0.35 -> 0.20). All six weapons now sit in the shoulder with both hands on them.
FSM tests 11/11, spawn smoke test 0 failures.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
