# Scale Tool

Scale Tool allows users to scale vertices using the brush.

Scale is an elastic deformation tool.

<div align="left"><figure><img src="/files/rXU3mJ9tAZxiWy5dj7c7" alt=""><figcaption></figcaption></figure></div>

Holding Ctrl will invert the Scale effect to the vertices.

<figure><img src="/files/3bF6FyGXFTfyfbbf0MaX" 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.


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