Magnetic

You know how Little Big Planet, Kingdom Hearts and similar have various pickups move towards your character when you get up close? Yea I also find that’s a nice bit of polish.

One way of getting that up and running in Unity is via the code below. Setup:

1. Add all objects you want to get attracted to the player to a special layer.
2. Attach the script below to your player.
3. Set the layer mask on the component to include the layer from step one.
4. Tweak, play, repeat.

 

Magnetic.cs:

using UnityEngine;
using System.Collections;

public class Magnetic : MonoBehaviour
{
    public LayerMask m_MagneticLayers;
    public Vector3 m_Position;
    public float m_Radius;
    public float m_Force;

    void FixedUpdate ()
    {
        Collider[] colliders;
        Rigidbody rigidbody;

        colliders = Physics.OverlapSphere (transform.position + m_Position, m_Radius, m_MagneticLayers);
        foreach (Collider collider in colliders)
        {
            rigidbody = (Rigidbody) collider.gameObject.GetComponent (typeof (Rigidbody));
            if (rigidbody == null)
            {
                continue;
            }
            rigidbody.AddExplosionForce (m_Force * -1, transform.position + m_Position, m_Radius);
        }
    }

    void OnDrawGizmosSelected ()
    {
        Gizmos.color = Color.red;
        Gizmos.DrawWireSphere (transform.position + m_Position, m_Radius);
    }
}