# Copy Scale Constraint¶

The *Copy Scale* constraint forces its owner to have the same scale as its target.

注釈

Here we talk of *scale*, not of *size*! Indeed, you can have two objects,
one much bigger than the other, and yet both of them have the same scale.
This is also true with bones: in *Pose Mode*,
they all have a unitary scale when they are in rest position,
represented by their visible length.

## Options¶

- Target
- データ ID used to select the constraints target, and is not functional (red state) when it has none.
- X, Y, Z
- These buttons control which axes of the target scale are copied.
- Power
- Allows raising the copied scale to the specified arbitrary power.
- Make Uniform
- Instead of copying scale for individual axes, apply a uniform scaling factor to all axes of the owner that achieves the same overall change in volume.
- Offset
- When enabled, the constraint combines the copied scale with the owner's scale, instead of overwriting it.
- Additive
- Uses addition instead of multiplication in the implementation of the
*Offset*option. - Space
- Standard conversion between spaces.

注釈

Since scale is a multiplicative quantity, it should be combined using multiplication,
and split into fractions or inverted via power. Thus the use of *Power* is
more mathematically correct than *Influence*, which uses linear interpolation.
The use of the *Additive* option is also not recommended.

ちなみに

To copy scale from one axis of the target to all axes of the owner,
disable other axes, enable *Make Uniform*, and set *Power* to 3.