Multi-look-target API: set_look_target(handle, target_id, x, y), clear_look_target(handle, target_id). Bones declare look_at as string target-id; legacy look_at=true maps to target_id="default". Slerp-style smoothing: look_at_slerp field (exponential approach, clamped to [0,1] per frame). Linear look_at_speed kept for backward-compat. Virtual bone flag: virtual=true skips render pass but participates in compute_world. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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