# What is a collider component?

## What is a collider component?

Collider components define the shape of an object for the purposes of physical collisions. A collider, which is invisible, need not be the exact same shape as the object’s mesh and in fact, a rough approximation is often more efficient and indistinguishable in gameplay.

### What is the difference between Rigidbody and collider?

A rigidbody component is the component which allows an object to be affected by the physics system. Affected by the impact of another object, be affected by drag, have a velocity, have a force applied, etc. Colliders are also tied in with the physics system, basically setting boundaries around objects.

#### What are colliders in Unity?

Colliders are Components built in to Unity that provide collision detection using their various ‘Bounding Boxes’, the green lines shown surrounding the tree in the below image.

What does box collider do in Unity?

The Box Collider can be resized into different shapes of rectangular prisms. It works great for doors, walls, platforms, etc. It is also effective as a human torso in a ragdoll or as a car hull in a vehicle.

What is a collider definition?

Definition of collider : a particle accelerator in which two beams of particles moving in opposite directions are made to collide.

## Does collider need rigidbody?

In Unity3D, you need rigidbodies on GameObjects that use colliders, as they use physics. You don’t need rigidbodies on static GameObjects because they don’t use physics, though you still need to have at least one in the calculation.

### What is a trigger vs collider?

The physics engine simulates collisions using colliders. We can determine which objects will collide with each other, or how objects will behave under collisions using colliders. On the other hand, triggers are special setups of colliders. The purpose of triggers is to trigger events when more than one objects overlap.

#### What is the difference between trigger and collider?

An easy way to differentiate between the two is to think of them visually. OnCollisionEnter can be visualized as colliding against a wall, and OnTriggerEnter can be visualized as triggering an alarm. Let’s take a look at them individually.

What is a collider variable?

In statistics and causal graphs, a variable is a collider when it is causally influenced by two or more variables. The name “collider” reflects the fact that in graphical models, the arrow heads from variables that lead into the collider appear to “collide” on the node that is the collider.

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