# 2D project settings reference

> Configure the project settings Unity uses to generate physics outlines for sprites.

Configure the project settings Unity uses to generate physics outlines for sprites.

To open these settings, go to **Edit** > Editor > **2D**.

## Physics Outline

| **Property**             | **Description**                                                                                                                                                                                                          |
| ------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Use Legacy Algorithm** | Disables Unity using a sub-pixel algorithm to generate physics outlines for sprites. Enabling this property makes physics outlines match previous versions of Unity, but might result in less accurate physics outlines. |

## Additional resources

* [Custom Physics Outline tab reference for the Sprite Editor window](/engine/6000.7/manual/unity2d/sprite/sprite-editor-window-reference/custom-physics-shape-editor-reference.md)
* [Create collision shapes for a sprite](/engine/6000.7/manual/unity2d/sprite/create-collision-geometry.md)
* [Project Settings reference](/engine/6000.7/manual/unity-editor/editor-settings-reference/comp-manager-group.md)