Prompt tracks — MotionLLM Assistant Docs

Write an action the character can perform#

Describe a concrete movement, pace and direction. Start with a short instruction such as A person takes two slow steps forward and stops. Refine one aspect at a time. Split a sequence of different actions into timed sections when you need control over when each action occurs.

The prompt is an instruction to a generative model. It does not guarantee exact contacts, object interaction or collision avoidance. Use constraints to provide additional direction, then review the animation.

Three text prompt sections arranged in sequence on a Motion LLM Prompt track — Write each action in its own prompt section and use the section boundaries to control its timing. View full-size image ↗

Touching sections share a job#

Sections whose end and start meet form one continuous generation block. A positive gap starts another independent block and remains empty in the generated output. Overlapping prompt sections within the chosen generation scope are rejected.

Walk0–4 s · Job 1

Turn4–8 s · Job 1

Gap8–10 s

Idle10–14 s · Job 2

Each block has its own output and job identity. Continuous prompts are sent as structured text and duration pairs; punctuation is part of your text.

Two adjacent prompt sections followed by an empty timeline gap and a separate third prompt section — The first two sections touch and share one continuous block. The gap before the third section starts an independent block. View full-size image ↗

Choose what to generate#

Action	Scope
Generate This Motion LLM Prompt Track	All prompt sections in the selected track row. Use this to generate one row without including other rows.
Generate All Motion LLM Prompt Sections	The root-track action gathers the rows and their sections. Check the combined timing for overlaps before using it.
Bake Control Rig	Bakes existing generated blocks into editable rig takes. It does not generate new motion.

Generate This Motion LLM Prompt Track button beside the prompt row, with a generation progress notification open — The triangle button runs Generate This Motion LLM Prompt Track. The notification reports the active job. This development capture uses the Runtime service API; cloud jobs show their own provider and progress phases. View full-size image ↗

Timing and request limits#

Item	Current limit
Prompt section in the plugin	2–10 seconds. Duration comes from the Sequencer section range.
Sections in one continuous block	Up to 16, subject to the total-duration limit.
Cloud continuous block	Up to 30 seconds in the current cloud API.
Editor block validation	The editor allows up to 120 seconds; this does not override the lower cloud limit.
Cloud prompt text	Up to 1,000 characters per prompt.
Samples	One generated sample per request.

Keep constraints inside the motion range#

Add Root 2D and Full Body tracks to the same character binding. Capture their keys inside the intended prompt block, before its exclusive end boundary. Empty, stale or conflicting keys prevent generation. The row action collects the constraints relevant to that row’s blocks; the aggregate action can report captured keys outside every block.

Seed and Auto Bake are track settings. Enable Override Generate Settings for track-specific diffusion and guidance options, or IK Override options for a different character setup. See Settings reference.

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