CODEWITHSUNDEEP
c#unity-game-engine
user5499363
user5499363

Reputation:

"Stick" gameObject to another gameObject after collision?

Currently, I am using the following code to make objects stick to other gameObjects:

void OnCollisionEnter(Collision col)
{
    rb = GetComponent<Rigidbody>();
    rb.isKinematic = true;
    gameObject.transform.SetParent (col.gameObject.transform);
}

It works perfectly, but it causes many other problems. For example, after colliding, it can no longer detect collisions.

Does someone possess an alternative to this code (which makes a gameObject stick to another one after collision)?

Upvotes: 0

Views: 1884

Answers (1)

maraaaaaaaa
maraaaaaaaa

Reputation: 8163

Here's a start for you, please note that this does not take into account rotation, that i'm sure you will be able to figure out, right? ;)

protected Transform stuckTo = null;
protected Vector3 offset = Vector3.zero;

public void LateUpdate()
{
    if (stuckTo != null)
        transform.position = stuckTo.position - offset;
}

void OnCollisionEnter(Collision col)
{
    rb = GetComponent<Rigidbody>();
    rb.isKinematic = true;

    if(stuckTo == null 
        || stuckTo != col.gameObject.transform)
        offset = col.gameObject.transform.position - transform.position;

    stuckTo = col.gameObject.transform;

}

EDIT: As promised, here is a more advanced version taking rotation into account:

Transform stuckTo;
Quaternion offset;
Quaternion look;
float distance;

public void LateUpdate()
{
    if (stuckTo != null)
    {
        Vector3 dir = offset * stuckTo.forward;
        transform.position = stuckTo.position - (dir * distance);
        transform.rotation = stuckTo.rotation * look;
    }
}

void OnCollisionEnter(Collision col)
{
    rb = GetComponent<Rigidbody>();
    rb.isKinematic = true;

    if(stuckTo == null 
        || stuckTo != col.gameObject.transform)
    {
        Vector3 diff = col.gameObject.transform.position - transform.position;
        offset = Quaternion.FromToRotation (col.gameObject.transform.forward, diff.normalized);
        look = Quaternion.FromToRotation (col.gameObject.transform.forward, transform.forward);
        distance = diff.magnitude;
        stuckTo = col.gameObject.transform;
    }
}

Upvotes: 0

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