I'm a junior 3D artist trying to build my first proper character rig for a personal animation project, but I'm completely stuck on creating a flexible, intuitive spine and shoulder setup that deforms naturally during complex movements. I've followed tutorials for basic biped rigs in Maya, but my own rig feels clunky, with skin weighting that breaks around the collarbone and hips, and I'm unsure how to implement proper IK/FK switching and facial controls without the system becoming overwhelming. For character TDs or animators who have built production-ready rigs, what's your systematic approach to planning and building a robust skeleton? How do you troubleshoot and clean up problematic weight painting, and what are the essential custom attributes and control systems you always include to make the rig both powerful for an animator and manageable for you to maintain?
Here's a practical, scalable approach to planning and building a robust skeleton for a character rig:
- Start with a modular base: pelvis, a spine chain (4–7 joints), neck, and head. This keeps deformations predictable and easy to tweak.
- Shoulder girdle: add a clavicle bone driven by torso rotation, plus a scapula that drives the shoulder joint. Tie the scapula to the chest and spine so volume stays consistent as the torso twists.
- Limbs: set up IK/FK for arms (blend with a control) and legs if needed, with a clean elbow/knee twist. Include subtle limb twist joints to maintain volume in forearms and calves.
- Spine twist: place 2–3 twist joints along the upper-to-mid spine to transport rotation to the ribcage without collapsing the torso mass.
- Create a compact control rig: a Master control plus region controls (spine, shoulders, arms, hips) and a separate control for facial or secondary features if needed. Keep a simple switch for IK/FK on limbs and perhaps a separate clavicle control for fine-tuning.
- Weight painting plan: start in rest pose, paint weights in zones (pelvis/hips, lower spine, mid spine, upper spine, chest, clavicle, scapula, arm joints). Mirror weights where possible and test ranges of motion (lift arm, rotate torso, bend over).
- Troubleshoot as you go: if hips or collarbone deform unexpectedly, add influences around the area (extra bones or tighter weight painting to those regions) and verify there’s no bleed into adjacent joints.
- Consider a dual quaternion skinning option if your tool supports it to reduce common distortion in twisting areas.
- Documentation: maintain a rig spec sheet with joint names, controls, influences, and a simple pose test list for quick reference.
If you want, I can tailor this into a concrete blueprint for Maya with joint counts and a control hierarchy based on your character’s proportions.