Blender 3D: Noob to Pro/Advanced Tutorials/Advanced Animation/Guided tour/Const/cr

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[edit] Copy Rotation

This constraint copies the rotation of the target. As simple as that. It can be an object or a bone. As you can see in the example, only the rotation gets copied.

[edit] The Constraint Panel

• You have 3 buttons to select which axis get copied over.

[edit] Where To Use It

Can be used with Copy Location to fake parent relationship. As you can key the influence you can make a character pickup something and holding it in his hands. Check the .blend for the hand-glass scene.

(?)link to the Blend(?)

You can also use this to align a plane with a 2D effect on it to the camera at all times. This works better than pointing it at the camera in some cases, such as a ring of atmospheric halo around a planet, where you don't want it disappear behind the planet.