How to rotate a rigid body around a point or any axis, and around three-quarters of the body, rather than around the center

[WREQI]

How to rotate a rigid body around a point or any axis, and around three-quarters of the body, rather than around the center

[saharan]

You can use Mat3#appendRotation to make a rotation matrix around an arbitrary axis. There's no method to directly rotate a rigid body around a specified point, so you should apply some translation after the rotation to get desired effect. RigidBody#getWorldPoint and RigidBody#translate may help you to do that.

[WREQI]

Thank you @saharan

[WREQI]

@saharan Is it possible to use hinge joints? Or in three.js, by adding objects to the parent object, by rotating the parent object, the child object can be rotated around any point, or in oimo by adding a parent object rigid body?

[saharan]

Yes, revolute joints play the same role as hinge joints (as written in README.md). There are no parent-child relationships between rigid bodies, though.