1c9b5f1828
Spatial properties move along their path by arc length: a table of 96 chords per segment, read back by linear interpolation of the curve parameter. Within each cell that mapping is linear, so the speed (the Graph Editor's speed graph, a central difference of the position) jumped at every cell boundary and was off by up to ~2 % on a curved path: a sawtooth over a constant-speed move, and a slight wobble in the motion itself. The table now holds Gauss-Legendre arc lengths, and `at_length` refines the cell's linear guess with Newton steps on the true arc length (|B'(u)| as the derivative), so position and speed follow the path exactly. Test: linear keys along a strongly curved path give a constant speed (within 0.1 %) at every sample; the old mapping was off by 2 %. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QiAJeFttZp83Fh7YuzAR5f |
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| lib.rs | ||
| text_doc.rs | ||
| value.rs | ||