Maintain Volume Constraint¶
The Maintain Volume constraint ensures that an object or bone keeps its original volume by automatically scaling down two axes when another axis is scaled up (and vice versa). This can be useful for stretching and squashing stylized characters, for example.
Options¶
Maintain Volume constraint.¶
- Mode
Specifies how the constraint handles scaling of the non-free axes.
- Strict:
Adjusts the scales of the non-free axes so that the volume is always exactly maintained. Scaling up the free axis will scale down both non-free axes. Scaling up a non-free axis will scale down the other non-free axis.
- Uniform:
Unlike Strict, this mode only maintains the volume correctly as long as the object is scaled equally along all three axes.
Scaling up the free axis alone will also scale down the non-free axes, but in an exaggerated manner that results in a loss of volume. As such, this is not recommended.
Scaling up a non-free axis has no effect on the other non-free axis. This makes it possible to deviate from the target volume.
- Single Axis:
Similar to Uniform, except the mode only maintains the volume correctly as long as the object is scaled purely along the free axis. Because only one axis needs to be adjusted to keep the volume instead of three, this may reduce the number of animation curves needed.
Changing the scale of a non-free axis again has no effect on the other non-free axis.
- Free Axis
The axis that should keep its user-specified scale. The other two (non-free) axes will be adjusted to maintain the volume.
- Volume
The target volume as a ratio of the original volume (when all axes have a scale of 1).
If all three axes have a default scale of 2 and this should be maintained, Volume should be set to 2×2×2 = 8.
- Owner
The space for determining and adjusting the scale of the owner.
- Influence
How strongly the constraint affects the owner.