Add/Remove Components in runtime

Question

I am creating a cube in script(c#). I want to remove the BoxCollider since i am developing a 2D game and exchange it through the BoxCollider2d. Then i want to add a RigiBody2D and show the cube in my world. The Problem is that i always get the error:

Can't add component 'BoxCollider2D' to Cube because it conflicts with the existing 'BoxCollider' derived component! UnityEngine.GameObject:AddComponent() CreateCube:OnCollisionEnter2D(Collision2D) (at Assets/Scripts/CreateCube.cs:15)

I get this error but the Code works anyways. BUT it only goes till the line Destroy(cube.collider); and thats it! The BoxCollider is defenitly removed correctly cause when i take a look at the created objects it is gone. I really dont know why the compiler is telling me that there is a existing BoxCollider.

using UnityEngine;
using System.Collections;

public class CreateCube : MonoBehaviour
{
    void OnCollisionEnter2D(Collision2D coll)
    {
        // Create Cube
        GameObject cube = GameObject.CreatePrimitive(PrimitiveType.Cube);

        // Destroy BoxCollider
        Destroy(cube.collider);

        // Add BoxCollider2D
        cube.AddComponent<BoxCollider2D>();

        // Add RigiBody2D
        cube.AddComponent<Rigidbody2D>();

        // Show Cube in World
        cube.transform.position = new Vector3(0, 0.5f, 0);
    }
}

Has anyone an idea?

you should probably not create a Cube primitive but a 2D sprite to begin with — LearnCocos2D

Johan Lindkvist Johan Lindkvist · Accepted Answer · 2015-10-23T11:06:54

Destroy will always wait until after the current Update loop to remove the component, so the Collider is not removed when you are adding the BoxCollider2D. Use DestroyImmediate instead.

However I would recommend to create a prefab with the things you want and use Instantiate instead. Like this:

// Create Cube
GameObject cube = Instantiate(yourPrefab, new Vector(0, 0.5f, 0), Quaternion.identidy) as GameObject;

Add/Remove Components in runtime

1 Answers