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#define BONESEL_NOSEL 0x80000000 /* Indicates a negative number */
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float calcVariance(struct ReebArc *arc, int start, int end, float v0[3], float n[3]);
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float calcDistance(struct ReebArc *arc, int start, int end, float head[3], float tail[3]);
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#define EBONE_VISIBLE(arm, ebone) ((arm->layer & ebone->layer) && !(ebone->flag & BONE_HIDDEN_A))
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#define EBONE_EDITABLE(ebone) ((ebone->flag & BONE_SELECTED) && !(ebone->flag & BONE_EDITMODE_LOCKED))