CODEWITHSUNDEEP
c#unity-game-enginecollision-detectionraycasting
Quelandoris
Quelandoris

Reputation: 13

Check if two Colliders overlap with Raycast?

Trying to detect if an object is overlapping with another object by using a Raycast Sphere with little or no distance. My relevant code is as follows:

//Check at location using Stationary Spherecast, apply damage effect if its a unit
        if (Physics.SphereCast (transform.position, 3, Vector3.up, out hit, 1)) {
            Debug.Log ("In Spherecast");
            if (hit.transform.CompareTag ("Enemy unit") || hit.transform.CompareTag ("Player Unit")) {
                Debug.Log ("In Spherecast's If");
                int Dmg = MM.MoveStat (Ours, SM.selected.GetComponent<EidolonClass> (), hit.transform.gameObject.GetComponent<EidolonClass> ());
                hit.transform.gameObject.GetComponent<EidolonClass> ().TakeDamage (Dmg);
            }
        }

At present, however, neither of those Debug.Log statements ever get output to the console. Is there something I'm misunderstanding about the spherecast, or about its constructors?

Upvotes: 0

Views: 3446

Answers (2)

Programmer
Programmer

Reputation: 125245

Trying to detect if an object is overlapping with another object

Use one of the Physics.OverlapXXX functions. There are many of them but if Sphere is what you are looking for then Physics.OverlapSphere should be used.

For the sake of performance, use the ones that ends with NonAlloc.

Physics.OverlapSphereNonAlloc should be fine for this. Just check if what it returns is > 0. 

Collider[] colliders = new Collider[5];

void Update()
{
    if (Physics.OverlapSphereNonAlloc(transform.position, 3, colliders) > 0)
    {
       //Overlaps!
    }
}

Note:

Make sure that a collier is attached to both GameObjects you want to check of they overlap with one another.

EDIT:

If you need to access the Colliders too:

Collider[] colliders = new Collider[5];

void Update()
{
    int hitCount = Physics.OverlapSphereNonAlloc(transform.position, 3, colliders);

    if (hitCount > 0)
    {
        Debug.Log("Touching!");

        for (int i = 0; i < hitCount; i++)
        {
            Collider C = colliders[i];

            Debug.Log("In Foreach for: " + C.name.ToString());
            if (C.transform.CompareTag("Enemy Unit"))
            {
                Debug.Log(C.name.ToString() + " Is an enemy");

                //...
            }
        }
    }
    else
    {
        Debug.Log("Not Touching!");
    }
}

Upvotes: 3

Quelandoris
Quelandoris

Reputation: 13

Ended up finding a solution that worked, taking ideas from the solutions Programmer and rutter suggested, as welll as looking around both on this site and on the official Unity Forums to find a solution that did what I needed. Heres the finished segment of code:

Collider[] collisions = Physics.OverlapSphere(transform.position,.75f);
		foreach (Collider C in collisions) {
			Debug.Log("In Foreach for: " + C.name.ToString());
			if (C.transform.CompareTag ("Enemy Unit")) {
				Debug.Log (C.name.ToString () + " Is an enemy");
				int Dmg = MM.MoveStat (Ours, SM.selected.GetComponent<EidolonClass> (), C.transform.gameObject.GetComponent<EidolonClass> ());
				C.transform.gameObject.GetComponent<EidolonClass> ().TakeDamage (Dmg);
			}
		}

Upvotes: 0

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