Detecting Collisions (OnCollisionEnter) - Unity Official Tutorials

Detecting a collision in Unity requires

one of the two colliding objects

to contain a script with an

OnCollisionEnter function in.

The basic syntax takes a single argument

of type Collision.

From this you can query the collision

to find out information about the object

that has been collided with.

In this example our samoflange ball is

bouncing around with a bouncy physic material

and hitting power cubes.

The script attached to the ball looks like this.

Currently we have nothing inside the function.

We can make use of the collision argument to

check for when it has hit a power cube.

We simply use an IF statement and check

'col', our variable, for the data

it contains. One example of which

is the game object that it's collided with

and as a result, the name. We would say

if(col.gameobject.name) is equal to

the hierarchical name of the power cube

which is 'prop_powercube'

and now this IF statement will only activate

when our ball collides with our power cube.

If it does collide, we'll make use of the

Destroy command. You can check what

types of data you can retrieve

from the collision by typing the name of the

variable and then typing a dot (period) in the script editor.

You'll then see a list of the various

different data you can retrieve from the collision.

Also remember to check the script reference

page linked below on the collision

class to see other data that you can retrieve.

For now we'll simply destroy the game object.

And when we save our script

you'll see that whenever a collision occurs

our ball destroys a power cube.