OnCollisionEnter does not work upon initial collision

I am a beginner in Unity and I am currently making a simple game. I have a problem where upon initial collision, the event that I wanted to happen does not trigger or in other words the OnCollisionEnter is not working upon initial collision.

The process of my script is when colliding which is the OnCollisionEnter the button will appear or it will be set active to true. But in the first collision it does not trigger or it is not working, I need to walk away a bit and go back in that way it only works. Sometimes I need to do it 2 or more times for the collider to trigger. I don't know if the script has problem or the collider itself but I made sure it is colliding properly when I look at the editor.

I set the object to static so it will not be pushed when walking and colliding towards it. I wonder if that has to do with this problem because even disabled it is the same. But can anyone give suggestions on how not to make the objects move or be pushed away upon collision?

Here is the script for my collision:

using UnityEngine;
using UnityEngine.UI;

public class InteractNPC : MonoBehaviour
{
    //public Button UI;
    [SerializeField] GameObject uiUse, nameBtn;
    private Transform head;
    private Vector3 offset = new Vector3(0, 1.0f, 0);
    // Start is called before the first frame update
    void Start()
    {
        //uiUse = Instantiate(UI, FindObjectOfType<Canvas>().transform).GetComponent<Button>();
        uiUse.gameObject.SetActive(true);
        head = transform.GetChild(0);
        uiUse.transform.position = Camera.main.WorldToScreenPoint(head.position   offset);
    }

    // Update is called once per frame
    void Update()
    {
        uiUse.transform.position = Camera.main.WorldToScreenPoint(head.position   offset);
        nameBtn.transform.position = Camera.main.WorldToScreenPoint(head.position   offset);
    }

    private void OnCollisionEnter(Collision collisionInfo)
    {
        //Debug.Log("wews2");
        if(collisionInfo.collider.name == "Player")
        {
            nameBtn.gameObject.SetActive(true);
        }
    }

    private void OnCollisionExit(Collision collisionInfo)
    {
        if(collisionInfo.collider.name == "Player")
        {
            nameBtn.gameObject.SetActive(false);
        }
    }
}

Here is another script with collision and has the same problem:

using UnityEngine;
using UnityEngine.UI;

public class InteractButtonPosition : MonoBehaviour
{

    //public Button UI;
    [SerializeField] GameObject uiUse;
    private Vector3 offset = new Vector3(0, 0.5f, 0);
    // Start is called before the first frame update
    void Start()
    {
        //uiUse = Instantiate(UI, FindObjectOfType<Canvas>().transform).GetComponent<Button>();
        //uiUse = GameObject.FindGameObjectWithTag("ViewButton");
    }

    // Update is called once per frame
    void Update()
    {
        uiUse.transform.position = Camera.main.WorldToScreenPoint(this.transform.position   offset);
    }

    private void OnCollisionEnter(Collision collisionInfo)
    {
        if(collisionInfo.collider.name == "Player")
        {
            Debug.Log("wews");
            uiUse.gameObject.SetActive(true);
        }
    }

    private void OnCollisionExit(Collision collisionInfo)
    {
        if(collisionInfo.collider.name == "Player")
        {
            //Destroy(uiUse.gameObject);
            uiUse.gameObject.SetActive(false);
        }
    }
        
}

CodePudding user response：

Try changing Colision detection from Descrete to Continuous collission detection

CodePudding user response：

I solved this issue by using OntriggerEnter instead of OnCollisionEnter. In the editor, for the NPC I put a Collider on each part of the body and check the IsTrigger in the parent Object so it will still collide with my character even if the IsTrigger is enabled that will make the character go through the object. I just enlarged the scale of the collider with IsTrigger enabled so the collision will be detected immediately.