Pose interpolation
TRS keyframe animation with createPoseTrack. Four { pos, rot } keyframes, cubic Hermite interpolation of position with auto-Catmull-Rom tangents, and slerp on rotations. A transport panel scrubs the track; a second panel toggles the trackPath overlay bits — PATH, CONTROLS, TANGENTS_IN, TANGENTS_OUT — and switches interpolation modes live. Unlike createCameraTrack, which applies its result to a camera automatically, PoseTrack produces an interpolated pose you fold into the transform stack yourself with applyPose(track.eval(out)). Four keyframes, one object createPoseTrack returns a PoseTrack — a renderer-agnostic state machine for { pos, rot, scl } keyframes. track.add(spec) appends one; adjacent duplicates are skipped by default: ...