The Transform Constraint allows its owner to copy all the transformation properties from a target object, regardless of their hierarchical relationships. These properties include Position, Rotation, and Scale.
How to create a Transform Constraint
1. Add a Transform Constraint to an object
Use the Constraints section of the Inspector to add a Transform Constraint to an object.
2. Choose a target
Use the new constraint's fly-out menu to select a target for this constraint.
3. Test that the Transform Constraint is working
Manipulating the target object now causes the constrained object to copy Position, Rotation, and Scale properties.
The Strength property determines how much the constrained object is affected.
A Strength of 0% means the constraint won't have any effect.
A Strength of 50% means half the value from the target will be applied.
Choose whether this constraint should use World or Local coordinates for the Source Space.
Choose whether this constraint should use World or Local coordinates for the Destination Space.
Example: mechanical arm
Consider the package resting on the table and the mechanical arm below.
Add a Transform Constraint to the package and a target group at the end of the arm.
The target group is a child of the arm hierarchy, so it moves with the arm.
With a Strength of 100%, all the transform properties of the package match the target. Notice how the package moves and rotates correctly with the movement of the arm.
Set the Strength to 0% to make the arm drop the package.