Skeleton Rigging

Automatic character rigging uses software-assisted steps to place a skeleton, bind a mesh, calculate initial skin weights, and prepare controls. The result is a starting rig, not a guarantee of production-ready deformation. Joint placement, weight transitions, control behavior, and export compatibility still need review on the actual character.

Place joints around the character’s real rotation centers: hips at the pelvis, knees and elbows on their bend axes, ankles at the foot pivot, shoulders at the clavicle and upper-arm transition, and fingers at each knuckle. Test placement in multiple poses because a joint that looks correct in a neutral pose can still collapse the mesh when bent.

Test shoulders, elbows, wrists, hips, knees, ankles, neck, and facial or finger areas if included. Inspect both extreme and ordinary poses for collapsing volume, candy-wrapper twists, pinching, unintended influence, and left-right asymmetry. Correct the vertex groups or weight maps before approving the bind.

Forward kinematics rotates a control chain from parent to child and is useful for arcs and free motion. Inverse kinematics positions an end control and solves the chain toward it, which is useful for planted feet and reaching hands. A stable rig may provide both, plus matching and switching behavior that must be tested without visible pops.

Run a range-of-motion pose set: deep bends, twists, arm raises, crouches, foot plants, spine arcs, and silhouette checks. Look for volume loss, intersections, sliding, flipped joints, and control instability. Add corrective weights, helper bones, or corrective shapes where the base bind is insufficient.

Usually, but verify the target engine’s skeleton hierarchy, bone naming, root-motion convention, scale, axis orientation, bind pose, supported constraints, and animation baking requirements. Export a small test clip first, then inspect the imported mesh, bone transforms, skin weights, and IK/FK-baked motion in the engine before production handoff.