Collider Types & Properties

• BoxCollider: Simple cubic collision, size & center

• SphereCollider: Radius-based collision, perfect for rolling

• CapsuleCollider: Character controllers, standing objects

• MeshCollider: Complex shape collision, performance heavy

• TerrainCollider: Landscape collision

• WheelCollider: Vehicle physics & suspension

Collision Events

• OnCollisionEnter: First contact

• OnCollisionStay: Continuous contact

• OnCollisionExit: End of contact

• OnTriggerEnter: Enter trigger zone

• OnTriggerStay: Inside trigger zone

• OnTriggerExit: Exit trigger zone

Physics Detection

• Raycast: Line-based object detection

• BoxCast: Box-shaped detection beam

• SphereCast: Sphere-shaped detection sweep

• OverlapSphere: Find objects in radius

• OverlapBox: Find objects in box area

• RaycastAll: Get all objects in ray path

Pro Tips

• Use simple colliders (Box, Sphere) over Mesh for performance

• Combine multiple simple colliders instead of one complex MeshCollider

• Cache collision results for better performance

• Use RaycastNonAlloc for optimized memory usage

Common Pitfalls

• Setting MeshCollider convex without understanding implications

• Heavy calculations in collision callbacks

• Forgetting to set proper collision layers

• Using too many overlapping colliders

• Not considering physics performance impact