Rigging

Definition

Rigging is the process of constructing a hierarchical system of bones, joints and control handles—collectively called a “rig”—within a 3D character model. This skeleton drives mesh deformation, enabling animators to pose characters, articulate limbs and define facial expressions through intuitive controls rather than manipulating raw vertices.

Historical Development

In early 3D animation, models were static meshes that animators moved frame by frame. As film and game demands grew, technical directors introduced skeletal rigs during the 1990s to streamline character animation. Pioneering studios like Pixar and ILM developed proprietary rigging systems—such as Pixar’s Marionette and ILM’s Zeno—that offered advanced skinning, stretchy bones and automated weighting tools. Today, off-the-shelf packages like Autodesk Maya and Blender include powerful rigging toolsets.

Rigging Workflow

1. Joint Placement: Technical artists place joints at anatomical pivot points—spines, shoulders, elbows, knees—ensuring rotations mimic real anatomy.
2. Hierarchy Construction: Joints are parented to form a skeleton; root joints drive entire subtrees of bones.
3. Control Creation: Custom NURBS or locator objects provide animators with user-friendly handles for posing.
4. Skin Binding: Mesh vertices are bound to bones through weight maps that determine deformation influence (see Skinning).
5. Advanced Features: Riggers add IK/FK switches, stretchy limbs, corrective blend shapes and automated secondary motion (jiggle and dynamics).

Role in Production

Effective rigging accelerates animation by delivering predictable deformations and reducing frame-by-frame fixes. Complex characters—quadrupeds, creatures and stylized humans—rely on sophisticated rigs to maintain consistent volume and silhouette throughout performance.

Trivia

• Some feature-film rigs contain thousands of control attributes, hidden behind simplified animator interfaces.
• The term “rigging” recalls nautical rigging, where sailors set up mast and sail systems—a fitting metaphor for setting up a character’s internal support.