Auto-Rig Pro 3.67.39: The Complete Rigging Solution for Blender

For Blender artists, rigging characters is often described as a "necessary evil." It is technical, time-consuming, and fraught with weight painting frustrations. Enter Auto-Rig Pro (ARP) – an industry-leading addon that has changed the game for indie developers, animators, and 3D generalists.

Version 3.67.39 represents a mature, stable build of this powerful tool. This article provides a deep dive into its features, installation, workflow, and why it remains a top choice over Blender’s native Rigify.

Step C: Smart Features in Fit Mode

• Mirror: ARP > Tools > Mirror – copies position from right to left if you rig only one side.
• Reset Bone: Select a bone → click "Reset Selected" – returns to default position.
• Add/Remove Bones: You can add tail, wing, or prop bones here.

Face Rig (Basic)

• ARP 3.67.39 does not have the full Face module (that's extra in v3.7+).
• It includes: Jaw, Eyebrows (basic), Eyes (look-at).
• Install "Face Cap" plugin separately for full facial mocap.

2. The "Smart" Limb Re-targeting

One of the most frustrating aspects of auto-rigging is limb detection. If your character has slightly bent elbows or non-standard anatomy, older algorithms failed. The 3.67.39 update uses a new "Smart Re-targeting" AI heuristic that analyzes the vertex density of your mesh to predict joint placement, reducing manual correction time by roughly 40%.

3. Quadruped Support Refinement

While quadrupeds were supported before, version 3.67.39 introduces dedicated spine dynamics for creatures. Whether you are rigging a dragon, a wolf, or a horse, the new spine solver handles the "C-curve" and "S-curve" poses that are essential for realistic animal locomotion.

Typical workflow with Auto-Rig Pro

1. Prepare mesh: apply transforms, ensure topology is clean and named consistently.
2. Place auto-rig guide bones over the mesh (head, spine, limbs, fingers).
3. Generate rig: Auto-Rig Pro creates deform bones, control bones, and drivers.
4. Weighting: use automatic weights, then refine with weight painting tools.
5. Set up FK/IK and custom constraints; adjust bone rolls and limits.
6. Retarget or import animations if needed.
7. Export: bake animations and export via FBX/glTF for engines.