# Polygon Collider 2D component reference > Refer to the Polygon Collider 2D component properties to create freeform colliders. The Polygon Collider 2D component is a [Collider 2D](/engine/6000.7/manual/unity2d/2d-physics/collider-2d.md) that interacts with the 2D physics system. This collider's shape is a freeform edge of line segments that you can adjust to fit the shape of a sprite or any other shape. **Note**: The edge must completely enclose an area for the collider to work. | **Property** | **Function** | | ------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Edit Collider** | Select this to edit the collider's geometry by editing and moving its vertices. | | **Material** | Select the [Physics Material 2D](/engine/6000.7/manual/unity2d/2d-physics/physics-material-2d-reference.md) that determines properties of collisions, such as friction and bounce. | | **Is Trigger** | Enable this if you want the collider to behave as a trigger. The physics system ignores the collider when you enable this option. | | **Used By Effector** | Enable this if you want an attached Effector 2D component to use the collider. | | **Auto Tiling** | Enable this if the [Sprite Renderer](/engine/6000.7/manual/unity2d/sprite/sprite-renderer-reference.md) component for the selected sprite has its **Draw Mode** set to **Tiled**. This enables automatic updates to the shape of the [Collider 2D](/engine/6000.7/manual/unity2d/2d-physics/collider-2d.md), allowing the shape to automatically readjust when the Sprite’s dimensions change. If you don’t enable **Auto Tiling**, the Collider 2D geometry doesn’t automatically repeat. | | **Composite Operation** | If a [Composite Collider 2D](/engine/6000.7/manual/unity2d/2d-physics/collider-2d/composite-collider-2d/reference.md) component is attached to the same GameObject, sets how the component combines the collision shapes. The options are:**None**: Doesn't combine the collision shapes.**Merge**: Combines the collision shapes.**Intersect**: Creates a collision shape from the overlapping area of the collision shapes.**Difference**: Creates a collision shape from the non-overlapping area of the collision shapes.**Flip**: Creates a collision shape from the non-overlapping area of the collision shapes, but also includes the area outside the collision shapes.**Note**: When you set the value to an option other than **None**, the Composite Collider 2D component controls the following properties: **Material**, **Is Trigger**, and **Used By Effector**. | | **Offset** | Set the local offset values of the collider geometry. | | **Use Delaunay Mesh** | Enables Unity using a Delaunay triangulation algorithm to generate the collision shapes. Enabling this property can improve collision shapes for complex shapes, but can reduce performance. | | **Points** | Expand to view information about the complexity of the generated collider. | | **Layer Overrides** | Expand for the layer override settings. | |     **Layer Override Priority** | Sets the decision priority when this collision shape collides with another collision shape. Refer to its [API](/engine/6000.7/script-reference/unityengine/collider2d/layeroverridepriority.md) documentation for more information. | |     **Include Layers** | Sets the layers this collision shape collides with. Refer to [`Collider2D-includeLayers`](/engine/6000.7/script-reference/unityengine/collider2d/includelayers.md). | |     **Exclude Layers** | Sets the layers this collision shape doesn't collide with. Refer to [`Collider2D-excludeLayers`](/engine/6000.7/script-reference/unityengine/collider2d/excludelayers.md). | |     **Force Send Layers** | Sets the layers this collision shape sends forces to during collisions. Refer to [`Collider2D-forceSendLayers`](/engine/6000.7/script-reference/unityengine/collider2d/forcesendlayers.md). | |     **Force Receive Layers** | Sets the layers this collision shape can receive forces from during collisions. Refer to [`Collider2D-forceReceiveLayers`](/engine/6000.7/script-reference/unityengine/collider2d/forcereceivelayers.md). | |     **Contact Capture Layers** | Sets the layers of other Collider 2D components to capture during collisions. Refer to [`Collider2D-contactCaptureLayers`](/engine/6000.7/script-reference/unityengine/collider2d/contactcapturelayers.md). | |     **Callback Layers** | Sets the layers to report collisions or triggers with. Refer to [`Collider2D-callbackLayers`](/engine/6000.7/script-reference/unityengine/collider2d/callbacklayers.md). | | **Info** | Expand for read-only physics system related information about the collider. | ## Additional resources * [Collider 2D API documentation](/engine/6000.7/script-reference/unityengine/collider2d.md) * [Rigidbody 2D](/engine/6000.7/manual/unity2d/2d-physics/rigidbody-2d.md)