Documentation Docs/en/reference/model-format/animation.md

Model Animation Directives

Generated reference. Do not edit directly. Update BuildTools/ModelFormatInterface.json, then run python BuildTools/docs_model_format.py --write.

Index

Syntax

This page lists .fo3d directives that participate in animation selection or movement-pose composition. Effective durations, alias materialization, and script lookup are documented in Model Animation.

Directive	Syntax	Authoring contract	Runtime effect
`Anim`	`Anim <state> <action> <ModelFile\|animation-mesh> <clip\|~clip\|Base>`	Maps a state/action pair to a source animation clip. ModelFile selects the primary model source, ~ reverses playback, and Base selects the first source clip before conversion into the baked runtime rig.	The first declaration for a pair is registered; model-specific lookup and substitutions are described in the canonical model-animation guide.
`AnimSpeed`	`AnimSpeed <state> <action> <positive-float>`	Sets authored playback speed for one mapped state/action pair.	The speed multiplies runtime playback and divides the common effective duration.
`AllowAnimationGeometry`	`AllowAnimationGeometry <external-animation-file>`	Temporarily permits drawable geometry in one exact external Anim source while that source is repaired into a geometry-free animation file. The path resolves from the final concrete description, like an external Anim path.	Validation-only: the exception is not serialized. Duplicate, unselected, duplicate-resolved, or stale exceptions fail the bake, so remove each line with the repaired source export.
`AnimLayerValue`	`AnimLayerValue <state> <action> <layer> <value>`	Overrides one layer value whenever the exact authored state/action pair is requested.	The override is applied before redundant-call detection and model composition.
`FastTransitionBone`	`FastTransitionBone <bone>`	Marks a validated base-model bone for immediate transition reset when a newly attached child uses that Link bone.	The next body-animation track resets transition state for the marked attachment bone.
`StateAnimEqual`	`StateAnimEqual <from-state> <to-state>`	Defines a one-step state-animation alias.	The alias is applied once before exact animation lookup and has priority over an exact source-key entry.
`ActionAnimEqual`	`ActionAnimEqual <from-action> <to-action>`	Defines a one-step action-animation alias.	The alias is applied once before exact animation lookup and has priority over an exact source-key entry.
`DisableAnimationInterpolation`	`DisableAnimationInterpolation`	Disables keyframe interpolation on the model animation controller.	The registered animation controller samples without interpolation.
`DisableBackwardAnim`	`DisableBackwardAnim`	Disables WalkBack and RunBack selection for movement-pose animation.	Movement always uses forward walk/run and SetMoveDir also aligns look direction.
`RotationBone`	`RotationBone <bone>`	Selects the validated torso/body rotation bone and enables the movement overlay controller.	Look and move directions may diverge; body and configured head bones receive directional rotation while movement/turn animations play on the overlay controller.

Separation from 2D root motion

These directives drive 3D skeletal clips and model composition. NextX / NextY sprite-frame offsets and movement-projected frame selection belong to Sprite Root Motion.