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2D The collision body corresponds to 2D The object of the game , Can't be 3D and 2D A mixture of ;
This component can define the physical collision 2D The shape of the game object ;
The shape does not need to be exactly the same as the game object , Rough approximation is more effective in game operation .

2D Type of collider

By searching, you can see ,1D Collision bodies have the following 8 Types .

Box Collider 2D Box shaped impactor

It is a rectangular collision box .

1 Edit Collider Edit Frame

Can be in Scene Adjust the border of the collider in the view , The border is a rectangle box.

2 Material texture of material

Associative materials , The default is a 2D Physical material Physics Material 2D, Used to adjust 2D When physical objects collide, the friction and elastic .

Assets -> create -> 2D -> Physics Material 2D You can create a new one Physics Material 2D, Default friction coefficient Friction -> 0.4, elastic Bounciness -> 0.

3 Is Trigger Trigger switch

After selection , This 2D The collision experience runs as a trigger , So what is trigger ？ Take a look at my other article ：Unity Study - trigger Trigger_flashinggg The blog of

4 Used By Effector Effector switch

If the collider uses Effectors 2D——2D Effector , You need to check this option to make the collision effect take effect . You can find the 2D Effector components are required and 2D Used in conjunction with collision bodies , About effectors, you can see this article first ：【Unity】Unity 2D Game development （ Two ）Effectors 2D Collision effectors

5 Used By Composite Mixing switch

If the collider uses Composite Collider 2D——2D Composite collision body , After checking this option, other attributes of the collision body will be ignored , Take the attributes of the composite collision body as the attributes of the collision body .

2D Composite collision body (Composite Collider 2D) - Unity manual

6 Auto Tiling Automatically adapt tiles

When Sprite renderer （Sprite Renderer） Of Draw Mode Set to Tiled when , Check Auto Tiling Can automatically adapt to Sprite Tile of .

About the sprite renderer, you can first see the official documents , Sprite renderer (Sprite Renderer) - Unity manual , I will study later .

7 Offset Offset adjustment

and Size Together , Used to adjust the position of the collider .

8 Size Boundary adjustment

and Offset Together , Used to adjust the position of the collider .

9 Edge Radius Corner radius

Control the radius around the edge , Is that the vertex is circular .（ At present, it is not clear that this parameter is for Box Collider Influence ）

Circle Collider 2D Circular impactor

1 Edit Collider Edit Frame

Can be in Scene Adjust the border of the collider in the view , The border is a circle .

6 Raidus radius

Change the size of the collision body .

Other attributes follow Box Collider 2D identical

Edge Collider 2D Edge collider

1 Edit Collider Edit Frame

Can be in Scene Adjust the border of the collider in the view , Outline yourself , This contour does not need to completely enclose an area , It can be a straight line or L shape .

7 Points Some information

Some information about contour points .

Other attributes follow Box Collider 2D identical

Polygon Collider 2D Polygon Collider

1 Edit Collider Edit Frame

Can be in Scene Adjust the border of the collider in the view , The border is automatically fitted according to the contour at first , You can modify it yourself . And Edge Collider The difference is , The edge of the polygon collision body must completely enclose an area .

Other attributes follow Box Collider 2D identical

Capsule Collider 2D Capsule collider

The capsule collider is composed of two hemispheres connected with a cylinder , It's like a capsule , Suitable for columnar objects .

Capsule collider (CapsuleCollider) - Sun‘ Dazzling blog - Blog Garden (cnblogs.com)

Composite Collider 2D Composite collision body

2D Composite collision body (Composite Collider 2D) - Unity manual

This collision body has no fixed shape , In the box shaped collision body mentioned above Box Collider Collide with polygon Poly Collider All have a property ——Used By Composite, Choose this option ,2D Composite colliders will merge their shapes .

5 Geometry Type Geometric type

After the merger , The vertices of the selected collider are combined into two different geometric types ：

Outlines—— Hollow contour , similar Edge Collider 2D
Polygons—— Implement polygon , similar Polygon Collider 2D

6 Generation Type Geometry when changes occur

（ This part is not very clear about what it can be used for , Write it down first .）

Synchronous—— Automatically generate new aggregates immediately
Manual—— Manual

7 Vertex Distance Vertex distance limit

Set a value , To regulate the minimum spacing allowed for any vertex collected from the collider , It can be used to control the effective resolution of fixed-point combination .

8 Offset Distance Offset distance limit

Be similar to Vertex Distance

Other attributes follow Box Collider 2D identical

Custom Collider 2D Custom collider

Need to use PhysicalShape2D To achieve custom , To be specific, see ：

Custom Collider 2D - Unity manual

Tilemap Collider 2D Tile Map collision body

For the same game object Tilemap Each tile of the component generates a collision body , When creating a Tilemap Collider 2D when , It will automatically create one Tilemap Components ：