Gray: Default.<br>Blue wire-frame: in Pose Mode.<br>Green: with Constraint.<br>Yellow: with <a href="https://docs.blender.org/manual/en/dev/animation/constraints/tracking/ik_solver.html">IK Solver constraint</a>.<br>Orange: with Targetless Solver constraint.
![今日の英語 – しなければならない – must/have to ; しなくて良い – don’t have to [2019/11/29]](https://harikiri.diskstation.me/myblog/wp-content/uploads/2020/11/F12C8F86-A0B0-4334-9DAD-E75022893870.jpeg)