private void RotateAroundTransform(DragData drag)
{
// In order to add two quaternion rotations correctly you multiply them.
// To subtract you need to multiply by the inverse.
Quaternion rotationDelta = (
Snap.LocalRotationOfWorldRotation(mesh.transform, drag.transform.rotation) *
Quaternion.Inverse(Snap.LocalRotationOfWorldRotation(mesh.transform, drag.startTransformRotation))
);
Quaternion snappedRotationDelta = Snap.RotationDelta(rotationDelta);
transform.position = Snap.RotateAroundPivot(mesh.transform, transform.position, drag.transform.position, snappedRotationDelta);
}
