Pickup mechanic

Write a pickup script for collectible items.

Pickup Mechanism and Triggers

Collectibles such as coins, potions, or keys must allow the player to pass through rather than stopping movement like a solid wall. For this, Is Trigger is enabled on the Collider component.

// Trigger-enabled colliders report overlaps rather than solid impacts
void OnTriggerEnter(Collider other) {
    if (other.CompareTag("Player")) {
        // Execute collection logic
    }
}

This disables rigid physical collision while allowing overlap events to be processed via code.

Collection Event and Destroy

When the player intersects the coin, OnTriggerEnter executes. The player tag is confirmed, score is credited, and the collected item is purged using Destroy(gameObject).

void OnTriggerEnter(Collider other) {
    if (other.CompareTag("Player")) {
        // Increment score and delete coin from scene
        Destroy(gameObject);
    }
}

Optionally, a particle burst or audio cue is played at the pickup position for player feedback.

Exercise Coin pickup notification

Define a Start method. Inside, declare int altinDegeri = 10; and print "Toplanan altin: " + altinDegeri to the console.

Show example solution

using UnityEngine;

public class PickupTester : MonoBehaviour
{
    void Start()
    {
        int altinDegeri = 10;
        Debug.Log("Toplanan altin: " + altinDegeri);
    }
}

Test yourself

Which setting must be enabled on a Collider so a collectible coin can be passed through instead of blocking the player?
- Cast Shadows
- Is Kinematic
- Static Mesh
- Is Trigger
Show answer

Is Trigger — Enabling 'Is Trigger' on a Collider removes physical obstruction, allowing characters to overlap and trigger events.
Destroy collected game object
```
Destroy(____);
```
Show answer
```
Destroy(gameObject);
```
Pickup mechanism concepts

Is Trigger

Enables trigger overlap, no collision
OnTriggerEnter

Fires when object enters trigger volume
CompareTag

Safely verifies the tag of an object
Destroy

Removes the object from scene and memory

Next lesson: Score system

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