Question by andrewpmoore · Jan 05, 2017 at 05:30 PM · eulerangles rotation axis quaternions

Lock axis rotation on RigidBody

I'm trying to prevent an object from rotating on any axis except the x axis.

I'm trying the following:

 Rigidbody rb = gameObject.GetComponent<Rigidbody>();
 rb.constraints = RigidbodyConstraints.FreezeRotationY | RigidbodyConstraints.FreezeRotationZ;

When doing this over time the gameObject still rotates a little which is causing me problems.

I therefore tried to add

 Quaternion.Euler(transform.rotation.eulerAngles.x, 0, 0);

This fixes it rotating on the y and z axis, but with the way Quantenion's store information (from the little I understand) I shouldn't really be doing this and once it hits 90 degrees of rotation it just jumps around.

What way should I be doing this? I don't want to change what the physics engine is already doing to the x axis, but just want the Y and Z to be fixed and not rotate.

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