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This can happen at import time ( Import Settings Model Generate Colliders ) or at run time.

A collider doesnt need to be exactly the same shape as the objects mesh - a rough approximation is often more efficient and indistinguishable in gameplay.

It is more accurate for collision detection An automatic process performed by Unity which determines whether a moving GameObject with a Rigidbody and collider component has come into contact with any other colliders.

Mesh Colliders that are marked as Convex can collide with other Mesh Colliders.

When enabled, this runs some extra steps to guarantee the resulting Mesh is optimal for run-time performance.

This affects the performance of the physics queries and contacts generation.

When this setting is disabled, the physics engine uses a faster cooking time instead, and produces results as fast as possible.

This results in a Mesh that is better suited for use in collision A 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 detection and tends to produce more accurate hit points.

When enabled, the physics engine combines the vertices that have the same position.

This is important for the collision feedback that happens at run time.

When you enable this option, the physics engine uses a faster algorithm that doesnt require any R-Trees for spatial access.

If you encounter mid-phase issues at runtime on some platform, you can still disable this option to use the slower legacy mid-phase algorithm instead.

The available options for a Material depend on which Shader the Material is using.

Unity supports triangulated or Quadrangulated polygon meshes.

A GameObjects functionality is defined by the Components attached to it.

More info See in Glossary, and reads the properties of the attached Transform to set its position and scale correctly.

The benefit of this is that you can make the shape of the Collider exactly the same as the shape of the visible Mesh for the GameObject, which creates more precise and authentic collisions.

However, this precision comes with a higher processing overhead than collisions involving primitive colliders (such as Sphere, Box, and Capsule), so it is best to use Mesh Colliders sparingly.

This means GameObjects can pass through them from one direction, but collide with them from the other.

Cooking builds the spatial search structures for the physics queries, such as Physics.Raycast, as well as supporting structures for the contacts generation.

Unity cooks all Meshes before using them in collision detection.

Mesh Enabler 2019