| Direction | Up Vector Options
Constrains the axis of a selected object to another object without changing the location of the constrained object; instead, it changes the orientation of the constrained object. The aligned axis (the X axis by default) of the constrained object always remains facing the center of the constraining object.
For more information, see Direction Constraints [ Animation ].
To apply: Select an object, Constrain 
Direction, then pick the object to which the selected object will be constrained.
To redisplay: Select the constrained object, choose Explore Constraints on the MCP, and click the constraint's icon.
| Active |
Toggles the activeness of this constraint. |
| Blend Weight |
Blends the weight of this constraint with other constraints on the selected object. |
The up-vector constraint makes the Y axis of a constrained object point to a constraining (control) object or a specific point. See Up Vector Options for information.
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