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Copy Rotation Constraint

The Copy Rotation constraint forces its owner to match the rotation of its target.

Options

Copy Rotation panel
Target
This constraint uses one target, and is not functional (red state) when it has none.
Bone
If Target is an Armature, a new field is displayed offering the optional choice to set an individual bone as Target.
Head/Tail
If a Bone is set as Target, a new field is displayed offering the optional choice where along this bone lays the target point.
Vertex Group
If Target is a Mesh, a new field is displayed offering the optional choice to set a Vertex Group as target.
X, Y, Z
These buttons control which axes are constrained – by default, all three are on.
Invert
The Invert buttons invert their respective rotation values.
Offset
When enabled, this control allows the owner to be rotated (using its current transform properties), relatively to its target’s orientation.
Space
This constraint allows you to chose in which space evaluate its owner’s and target’s transform properties.