Constrain XZ while setting local Y-rotation free. How?

Could you describe the situation some more? $$anonymous$$nowing what you are after would allow to give a more appropriate answer.

Here I could tell you to apply the rotation of the top object to the sub object and then apply a rotation to the sub object on the axis by the amount needed, but they could be better ways.

Okay, I'm working on a game that is arranged in a planetary gravity setup. The player is attached to a game object that is always orientated parallel to the planets surface. But I need the player to be able to move freely around it's own Y axis while it is attached to the other gameobject, because I want to rotate it by using rigidbody.AddRelativeTorque. The player is a rigidbody of course.

So you want only the player to be constrained on the x and z axis if i'm understanding this correctly. Have you tried setting the players rigidbody "freeze rotation" constraints to stop rotation on these two axes?

Hey - thank you but this is not what I need. Sorry for my english.