Limit Scale Constraint
An object or bone can be scaled along the X, Y and Z axes. This constraint restricts the amount of allowed scalings along each axis, through lower and upper bounds.
It is interesting to note that even though the constraint limits the visual and rendered scale of its owner, its owner’s data block still allows (by default) the object or bone to have scale values outside the minimum and maximum ranges (as long as they remain positive!). This can be seen in its Transform Properties panel (N). When an owner is scaled and attempted to be moved outside the limit boundaries, it will be constrained to those boundaries visually and when rendered, but internally, its coordinates will still be changed beyond the limits. If the constraint is removed, its ex-owner will seem to jump to its internally specified scale.
Similarly, if its owner has an internal scale that is beyond the limits, scaling it back into the limit area will appear to do nothing until the internal scale values are back within the limit threshold (unless you enabled the For Transform option, see below – or your owner has some negative scale values).
Setting equal the min and max values of an axis, locks the owner’s scaling along that axis. Although this is possible, using the Transformation Properties axis locking feature is probably easier.
- Minimum/Maximum X, Y, Z
- These buttons enable the lower boundary for the scale of the owner along respectively the X, Y and Z axes of the chosen Space.
- The Min and Max numeric fields to their right control the value of their lower and upper boundaries, respectively.
- Note that if a min value is higher than its corresponding max value, the constraint behaves as if it had the same value as the max one.
- For Transform
- We saw that by default, even though visually constrained, and except for the negative values, the owner can still have scales out of bounds (as shown by the Transform Properties panel). Well, when you enable this button, this is no more possible – the owner transform properties are also limited by the constraint.
- Note however that the constraint does not directly modifies the scale values: you have to scale one way or the other its owner, for this to take effect.
- This constraint allows you to chose in which space evaluate its owner’s transform properties.