Composite Collider 2D

The Composite Collider 2D component is a ColliderAn invisible shape that is used to handle physical collisions for an object. A collider doesn’t need to be exactly the same shape as the object’s mesh - a rough approximation is often more efficient and indistinguishable in gameplay. More info
See in Glossary that interacts with the 2D physics system. Unlike most Colliders, it does not define an inherent shape. Instead, it merges the shapes of any Box Collider 2D or Polygon Collider 2D that you set it up to use. The Composite Collider 2D uses the vertices (geometry) from any of these Colliders, and merges them together into new geometry controlled by the Composite Collider 2D itself.

Property	Function
Material	Select the Physics Material 2DUse to adjust the friction and bounce that occurs between 2D physics objects when they collide More info See in Glossary that determines properties of collisionsA collision occurs when the physics engine detects that the colliders of two GameObjects make contact or overlap, when at least one has a Rigidbody component and is in motion. More info See in Glossary, such as friction and bounce.
Is Trigger	Enable this if you want this Collider 2D to behave as a trigger. The physics system ignores this Collider when this is enabled.
Used by Effector	Enable this if you want the Collider 2D to be used by an attached Effector 2D.
Offset	Set the local offset values of the Collider 2D geometry.
Geometry Type	Select the type of geometry to merge the vertices of the selected Colliders into. Select either Outlines or Polygons from the dropdown menu.
	Outlines	Select this to produce a Collider 2D with hollow outlines, identical to an Edge Collider 2D.
	Polygons	Select this to produce a Collider 2D with solid polygons, identical to a Polygon Collider 2D.
Use Delaunay MeshThe main graphics primitive of Unity. Meshes make up a large part of your 3D worlds. Unity supports triangulated or Quadrangulated polygon meshes. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. More info See in Glossary	Enable this property to an additional Delaunay triangulation step to produce the Collider mesh.
Generation Type	Select the geometry generation method used when either the Composite Collider 2D is changed, or when any of the Colliders composing the Composite Collider 2D is changed.
	Synchronous	Select this to have Unity immediately generate new geometry when a change is made to the Composite Collider 2D or to any of the Colliders composing it.
	Manual	Select this to have Unity only generate geometry generation happens when you request it. To request generation, either call the CompositeCollider2D.GenerateGeometry scripting API, or select Regenerate Geometry that appears under the selection.
Vertex Distance	Set a value for the minimum spacing allowed for any vertices gathered from Colliders being composed. Any vertex closer than this limit is removed. This allows control over the effective resolution of the vertex compositing.
Offset Distance	Set the value to offset vertices when compositing multiple physics shapes. Any vertices between physics shapes within this distance value are combined. Note: It’s recommended to not set this value higher than 1% of the SpriteA 2D graphic objects. If you are used to working in 3D, Sprites are essentially just standard textures but there are special techniques for combining and managing sprite textures for efficiency and convenience during development. More info See in Glossary’s length, as this may result in loss of detail when too many vertices are combined together.
Layer Overrides	Expand for the Layer override settings.
	Layer Override Priority	Assign the decision priority that this Collider2D uses when resolving conflicting decisions on whether a contact between itself and another Collision2D should happen or not. Refer to its API page for more information.
	Include Layers	Select the additional Layers that this Collider 2D should include when deciding if a contact with another Collider2D should happen or not. Refer to its API documentation for more information.
	Exclude Layers	Select the additional Layers that this Collider 2D should exclude when deciding if a contact with another Collider2D should happen or not. Refer to its API documentation for more information.
	Force Send Layers	Select the Layers that this Collider 2D is allowed to send forces to during a Collision contact with another Collider2D. Refer to its API documentation for more information.
	Force Receive Layers	Select the Layers that this Collider 2D can receive forces from during a Collision contact with another Collider2D. Refer to its API documentation for more information.
	Contract Capture Layers	Select the Layers of other Collider 2D, involved in contacts with this Collider2D, that will be captured. Refer to its API documentation for more information.
	Callback Layers	Select the Layers that this Collider 2D, during a contact with another Collider2D, will report collision or trigger callbacks for. Refer to its API documentation for more information.

Composing with the Box Collider 2D and Polygon Collider 2D

Both the Box ColliderA cube-shaped collider component that handles collisions for GameObjects like dice and ice cubes. More info
See in Glossary 2D and Polygon Collider 2D components have the Used By Composite property, which allows them be merged and composed into a single Collider with the Composite Collider 2D. These Colliders must also be attached to the same Rigidbody 2D as the Composite Collider 2D. When you enable Used by Composite, other properties disappear from that component, as they are now controlled by the attached Composite Collider 2D.

Refer to the CompositeCollider2D API documentation for more information about scripting with the Composite Collider 2D.

CompositeCollider2D

Capsule Collider 2D

Custom Collider 2D

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Composite Collider 2D

Composing with the Box Collider 2D and Polygon Collider 2D