Auto-Rigging a Character: a Skeleton without Manual Work
Rigging is the creation of the skeleton a character moves by. It is usually built by hand: an artist places the joints, links them and configures how each body part will move. In complex projects this takes hours or even days.
Animatic builds the skeleton automatically from a finished 3D model. You get a working rig that can be used for animation right away, while still keeping the option to adjust the result manually.
Why a Character Needs a Skeleton
The model on its own is a static surface. To animate it, you need a bone hierarchy: the upper arm pulls the forearm, the forearm pulls the hand, the thigh affects the knee and shin. When the bones rotate, the character's surface moves with them.
The skeleton determines which motions are possible and how natural they look. That is why rigging quality directly affects the animation result.
What You Get as a Result
- An anatomically correct skeleton. Joints sit at the bend points, and the bones match the character's proportions. The skeleton includes the spine, limbs, hands and feet.
- A ready hierarchy. The bones are linked in the correct order, so rotating one of them propagates to its children.
- A basis for skinning. The skeleton is immediately ready for the next stage, where the model's vertices are bound to the bones.
How Automatic Rigging Works
The program analyzes the shape of the model: it finds the torso, the limbs and the characteristic points from which the joints are determined. Then it builds a bone hierarchy that matches the structure of the human body. The process is fully automatic and requires no manual placement.
The quality of the result depends on the source model. The cleaner the geometry and the more expressive the character's pose, the more accurate the skeleton.
Which Mode to Choose
The program offers several rigging options:
- Basic rigging is available in the free mode. It suits simple characters and quick checks.
- Advanced rigging is available on paid plans. It handles complex models more accurately, including ones with non-standard proportions.
Step-by-Step Process
- Make sure the 3D model has been created and is open in the program.
- Start skeleton building with the "Skeleton Generation" button.
- Open the result in the viewer and check the joint placement.
- If needed, adjust the bone positions manually and save the rig.
How to Check the Skeleton
Always check the rig before animating:
- the joints should sit at natural bend points: elbows, knees, wrists, shoulders;
- the bones should not stick out of the model;
- the hierarchy should be whole, without "floating" bones.
If something looks wrong, it is better to fix the skeleton now. Errors in the rig carry into the animation and are hard to spot in the finished video.
Tips for a Better Result
- Use the model in a neutral pose with arms outstretched or legs straight: joints are detected more accurately that way.
- Remove extra detached geometry pieces, such as dust or background fragments.
- If the character has an unusual shape — for example, a tail or wings — check that these parts are also correctly connected to the skeleton.
What Next
After rigging comes skinning: each vertex of the model is assigned influence weights for the bones. The weights determine exactly how skin and clothing stretch during motion. More details — in the article "Skinning and Bone Weights".