Priority of the system createPoseTargetCaptureSystem builds: one
notch before §39 step 3, "animation target evaluation"
(PRIORITY_ANIMATION_TARGETS).
§19 step 1 is "animation produces a target pose", so every system that writes
a PoseTarget runs at step 3 or later, and the history capture has to be the
last thing before them: capture at step 3 − 1 and the whole of the §39 order
from step 3 onwards is "this step's target motion". Registering a target
writer earlier than this — anywhere in steps 1–2 — would have its write
flattened by the capture, which is the one ordering mistake this constant
exists to make nameable.
Priority of the system createPoseTargetCaptureSystem builds: one notch before §39 step 3, "animation target evaluation" (
PRIORITY_ANIMATION_TARGETS).§19 step 1 is "animation produces a target pose", so every system that writes a
PoseTargetruns at step 3 or later, and the history capture has to be the last thing before them: capture at step 3 − 1 and the whole of the §39 order from step 3 onwards is "this step's target motion". Registering a target writer earlier than this — anywhere in steps 1–2 — would have its write flattened by the capture, which is the one ordering mistake this constant exists to make nameable.