Procedural Motion Systems

Semantic state is the source of truth; transforms are its presentation. Keep one writer for each position, orientation, velocity, phase, and event channel.

Process

1. Declare state and its writer

Name the observable motion, SI units, coordinate frame, stable actor identity, initial state, phase/event state, and duration contract: finite with a terminal pose plus velocity/hand-off rule, periodic with a wrap rule, or open-ended with a stop/reset policy. Assign one writer to every animated channel; clips, procedural roots, instance storage, camera rigs, and external solvers may own different channels only through an explicit layering order.

When another simulation supplies or reacts to motion, declare: