Reset a "One grab rotate transformer"
I've got a lever that I'm manipulating with a "grabbable" a "hand grab interactable" and a "One grab rotate transformer" the last one with constraints. This is working fine. But when released the lever stays in the transformed position. I would like the lever to return to its original position when released.
If I add a method to return the "target transform" to its original rotation and call it from the unity event wrapper on "when unselect" it seems to work until one tries to manipulate the lever again it then appears that the constraints have rotated by half the difference between min and max. The lever will rotate correctly between these "new" min and max values but of course is visually in the wrong place. i.e if the min max values were originally from -20 to 20. After the "reset" they appear to be from -40 to 0.
Any suggestions on how to properly return the lever to its original position?
I did get a working solution in the end. I created a copy of the OneGrabRotateTransformer script and added the following to the EndTransform() method.
public void EndTransform() { Debug.Log("EndTransform"); var targetTransform = _grabbable.Transform; Vector3 localAxis = Vector3.zero; localAxis[(int)_rotationAxis] = 1f; _worldPivotPose = ComputeWorldPivotPose(); Vector3 rotationAxis = _worldPivotPose.rotation * localAxis; // update previous _previousVectorInPivotSpace = new Vector3(0f, 0f, 1f); //Quaternion deltaRotation = Quaternion.AngleAxis(_constrainedRelativeAngle - _startAngle, rotationAxis); Quaternion deltaRotation = Quaternion.AngleAxis(0f, rotationAxis); float parentScale = 1f; Pose transformDeltaInWorldSpace = new Pose( _worldPivotPose.rotation * (parentScale * _transformPoseInPivotSpace.position), _worldPivotPose.rotation * _transformPoseInPivotSpace.rotation); Pose transformDeltaRotated = new Pose( deltaRotation * transformDeltaInWorldSpace.position, deltaRotation * transformDeltaInWorldSpace.rotation); targetTransform.position = _worldPivotPose.position + transformDeltaRotated.position; targetTransform.rotation = transformDeltaRotated.rotation; _relativeAngle = 0.0f; _constrainedRelativeAngle = 0.0f; direction = Direction.None; }Although I haven't tested it I'm pretty sure the last three lines are sufficient 😀. Adding it to this method will reset the stick when the grab ends.
