CODEWITHSUNDEEP
unity-game-engine
Dvole
Dvole

Reputation: 5795

How to change Polygon Collider based on my animation in Unity3d?

I have a small car game, and when I move up/down and left/right, the sprite becomes different. But the physicsbody remains the same. How do I adjust physicsbody? I added a screenshot of my sprite. At the moment I have Polygon physics body as on the right one.

Here is the code that adjusts animation states:

 void FixedUpdate()
 {
     if (Input.GetKey(KeyCode.W)) {
         rb2d.AddForce(Vector2.up * physicsConstant);
         animator.CrossFade("CarUpIdle", 0);
     } else if (Input.GetKey(KeyCode.S)) {
         rb2d.AddForce(-Vector2.up * physicsConstant);
         animator.CrossFade("CarDownIdle", 0);
     } else if (Input.GetKey(KeyCode.D)) {
         rb2d.AddForce(Vector2.right * physicsConstant);
         animator.CrossFade("CarRightIdle", 0);
     } else if (Input.GetKey(KeyCode.A)) {
         rb2d.AddForce(-Vector2.right * physicsConstant);
         animator.CrossFade("CarLeftIdle", 0);
     }
 }

enter image description here

Upvotes: 2

Views: 4296

Answers (1)

killer_mech
killer_mech

Reputation: 1588

To Change polygon based on sprite first you will need to have Serializefield variables to keep track of all the respective colliders. In this script basically what I do is I am keeping all the polygon colliders in array and iterate the array and enable it depending upon the sprite.

In the script im putting the required sprites along with the respective collider for sprite in sequence. So when I request the sprite to change I enable the respective collider and disables the other colliders. You will require something similer like this :

[SerializeField]
private Sprite[] Sprites;
[SerializeField]
private PolygonCollider2D[] Colliders;
private int index = 0;
private SpriteRenderer sp;

void Start () {
    sp = GetComponent<SpriteRenderer>();
    sp.sprite = Value[index];
}

void OnGUI() {
    if(GUI.Button(new Rect(0,0, 80,35), "ChangeSprite")) {
        colliders[index].enabled = false;

        index ++;
        if(index > Value.Length -1) {
            index = 0;
        }
        sp.sprite = Sprites[index];
        colliders[index].enabled = true;
    }
}

Also in this tutorial it has been explained how to tackle this kind of problem Unity Game Tutorial

Another way to proceed is to remove the ploygon collider and recreate it

Destroy(GetComponent<PolygonCollider2D>());
gameObject.AddComponent<PolygonCollider2D>();

though this is very bad programming considering I will be creating collider on every sprite change which is heavy on game.

Upvotes: 2

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