# Scale Tool

Scale Tool allows users to scale vertices using the brush.

Scale is an elastic deformation tool.

<div align="left"><figure><img src="https://2202237093-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FililYtTOKJkeJpzbCa02%2Fuploads%2FCyMqtTGXsLtCrBqy76om%2FScale.gif?alt=media&#x26;token=578603d3-a1d7-4882-bdd4-1f63fec89eb1" alt=""><figcaption></figcaption></figure></div>

Holding Ctrl will invert the Scale effect to the vertices.

<figure><img src="https://2202237093-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FililYtTOKJkeJpzbCa02%2Fuploads%2FwKVBLE9z6BaBvJkQm5oq%2FScaleInverted.gif?alt=media&#x26;token=42656162-091c-4524-b04b-68344a115de2" alt=""><figcaption></figcaption></figure>

There are several options that affect how Scale Tool works.

| Option           | Description                                                   |
| ---------------- | ------------------------------------------------------------- |
| Stiffness        | How much the mesh resists shear                               |
| Incompressiblity | How compressible the spatial region is: 1 - 2 x Poisson ratio |
| IntegrationTime  | Integration Time for elasticity                               |
| BrushSteps       | Integration steps                                             |

Users can press Ctrl + Z to Undo and Ctrl + Y to Redo the operation.