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auto-rig

Design & creation

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Updated 10-16 02:32

About this skill

Auto-Rig — skeleton + skin weights for animation

Two paths, depending on whether you already have a mesh.

Tools

Both on the three.ws MCP server (@three-ws/mcp-server).

rig_mesh — rig an existing GLB ($0.20 USDC)

Auto-rig a static GLB: adds a humanoid skeleton and per-vertex skin weights via the three.ws rig pipeline (Make-It-Animatable by default).

Param Required Notes
glb_url yes http(s) URL to the static GLB to rig — e.g. the glbUrl returned by forge-3d (forge_free), mesh-forge, or text-to-avatar.

Returns the rigged glbUrl and a three.ws pose-studio link (https://three.ws/forge?action=rig...) where the model plays the canonical idle/walk clip library.

forge_avatar — text/image → rigged avatar in one call ($0.45 USDC)

Chains the whole pipeline: Granite prompt director → FLUX + TRELLIS/Hunyuan3D mesh → Make-It-Animatable auto-rig, so the model loads straight into the pose studio.

Param Required Notes
prompt one of prompt/images A single humanoid character, e.g. "a friendly cartoon astronaut in a glossy white suit".
image_url / image_urls one of prompt/images Single image, or 1–4 angles (front/back/left/right) for higher-fidelity reconstruction.
direct no Run the Granite prompt-director stage (text mode). Default true.
aspect_ratio no Reference aspect ratio (text mode). Default 3:4 (portrait — best for a full-body figure).
allow_non_humanoid no Off by default. A clearly non-humanoid subject (furniture, vehicle, quadruped) is rejected without charge. Set true only to force-rig a non-character.

Returns the rigged glbUrl, the intermediate mesh URL, a pose-studio link, the directed prompt, and per-stage timing. You are not charged if no rigged avatar is produced.

Which to use

  • Already have a GLB (from forge-3d, mesh-forge, text-to-avatar, or the user's own file) → rig_mesh ($0.20).
  • Starting from just a prompt or photos and want it rigged → forge_avatar ($0.45, generation + rig bundled).

How to run

  1. Pick the tool by whether a GLB already exists.
  2. Call it. Both are PAID over x402 — on a PaymentRequired result, surface the price and funding path; do not retry blindly.
  3. For forge_avatar, if the humanoid gate rejects a non-character prompt (no charge), suggest mesh-forge or forge-3d for that object instead.
  4. Return the rigged glbUrl and the pose-studio link so the user can preview the idle/walk animation.

Notes

  • Rigged output drives the three.ws canonical clip library — any humanoid skeleton is retargeted (no curated rig allowlist).
  • x402 settlement is in USDC; $THREE is the platform's only token.