Find nearest Gameobject in a Collision

Questions & Answers
1

I have build a big Floor with wall, doors and obstacles. My first Person Controller have a big capsule Collider around himself to detect a Collision. If this Capsule Collider get in contact with one of this Obsatcles, doors or walls, he would transform a sphere to this Point. The sphere has an Audio Sound to warn the First Person Controller. So i would like to find the nearest Object in an Collision, not only one Collision Point. If i move my FirstPersonController, he should find the new nearest Point an trasnform the ball to this Point. How can i do that (probably with OnCollisionStay)?

My Code:

public class Collision : MonoBehaviour
{

private AudioSource audioSource;
public GameObject roteKugel;
public GameObject warnKugel;
private AudioSource audioSourceWarn;
private Renderer rend;
private Renderer rend1;

void Start()
{
audioSource = roteKugel.GetComponent();
rend = roteKugel.GetComponent();
rend.enabled = true;
for (int i = 0; i < 1; i++)
{
Instantiate(roteKugel, new Vector3(0, 0, 0), Quaternion.identity);

    }

    audioSourceWarn = warnKugel.GetComponent<AudioSource>();
    rend1 = warnKugel.GetComponent<Renderer>();
    rend1.enabled = true;
    for (int i = 0; i < 1; i++)
    {
        Instantiate(warnKugel, new Vector3(0, 0, 0), Quaternion.identity);

    }

}

void OnCollisionEnter(UnityEngine.Collision collision)
{

    float distance;
    if (collision.gameObject.tag == "Untagged")

    {
        return;
    }
     ContactPoint contact = collision.contacts[0];
      if (collision.gameObject.tag == "Tuer" || collision.gameObject.tag == "Wand" || collision.gameObject.tag == "Fenster" || collision.gameObject.tag == "Hindernis")
            {
              roteKugel.transform.position = contact.point;
             }
          audioSource.Play();
      }

}

2

If you want to use OnCollisionStay, then the following should work (if you add private GameObject redOrb at the top):
private void OnCollisionStay(UnityEngine.Collision collision)
{
GameObject nearObject = null;
float nearObjectDistance = 0f;

        foreach (ContactPoint contact in collision.contacts)
        {
            float curDistance = Vector3.Distance(contact.otherCollider.transform.position, transform.position);
            Debug.Log("GO " + contact.otherCollider.name + " is " + curDistance + " units away");

            if (!nearObject || curDistance < nearObjectDistance)
            {
                nearObjectDistance = curDistance;
                nearObject = contact.otherCollider.gameObject;
            }
        }

        if (!redOrb)
            redOrb = Instantiate(roteKugel, new Vector3(0, -2, 0), Quaternion.identity);

        redOrb.transform.position = nearObject.transform.position;
    }

nearest game object

3

Okay sorry, he detect the nearest Collider, but he dont detect the nearest Point of the Collider…148276-export-1.png

4

You could do something like this:

public class NearestObject : MonoBehaviour
{
    public GameObject roteKugel;
    private GameObject redOrb;

    private void OnCollisionStay(UnityEngine.Collision collision)
    {
        GameObject nearObject = null;
        float nearObjectDistance = 0f;
        float nearObjectSeparation = 0f;
        Vector3 nearObjectContactPoint = Vector3.zero;

        foreach (ContactPoint contact in collision.contacts)
        {
            float curDistance = Vector3.Distance(contact.otherCollider.transform.position, transform.position);
            Debug.Log("GO " + contact.otherCollider.name + " is " + curDistance + " units away" + "

"
+ "contact.separation => " + contact.separation + "
");

            if (nearObject == null || curDistance < nearObjectDistance)
            {
                nearObjectDistance = curDistance;
                nearObject = contact.otherCollider.gameObject;
                nearObjectContactPoint = contact.point;
                nearObjectSeparation = contact.separation;
            }
        }

        if (!redOrb)
            redOrb = Instantiate(roteKugel, new Vector3(0, -2, 0), Quaternion.identity);

        Vector3 offsetVector = (nearObjectContactPoint - transform.position).normalized * nearObjectSeparation;

        //redOrb.transform.position = nearObject.transform.position;
        redOrb.transform.position = nearObjectContactPoint + offsetVector;
    }
}

https://gfycat.com/beautifulickyantipodesgreenparakeet
nearest point: https://gfycat.com/beautifulickyantipodesgreenparakeet