Raycast doesn't detect the ground when the player is on a ledge.

[albadalejoluca]

Hi, i’m fairly new to unity and C# programming overall and i am trying to make a basic physics based movement script but the problem i have now is that i’m trying to make my player jump by checking if he’s grounded with a raycast. Here is my code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Movement : MonoBehaviour
{
    
    private bool grounded;
    public float jumpforce;
    private float distToGround;

    public float thrust;

    public Rigidbody rb;
    public Transform PlayerCam;
    public Collider PlayerCollider;

    public float sensitivity;
    private float xRotation;
    private float desiredX;

    void Start(){
        
        rb = GetComponent<Rigidbody>();

        distToGround = PlayerCollider.bounds.extents.y;
        
    }

    void Update(){

        movement();
        rotation();
        jump();
        GroundCheck();
    }

    void movement(){

        if (Input.GetKey("z") && grounded == true)
        {
        rb.AddRelativeForce(Vector3.forward * thrust * Time.deltaTime);
        print("z");

        }

        if (Input.GetKey("s") && grounded == true)
        {
        rb.AddRelativeForce(Vector3.back * thrust * Time.deltaTime);
        print("s");

        }
        
        if (Input.GetKey("q") && grounded == true)
        {
        rb.AddRelativeForce(Vector3.left * thrust * Time.deltaTime);
        print("q");

        }

        if (Input.GetKey("d") && grounded == true)
        {
        rb.AddRelativeForce(Vector3.right * thrust * Time.deltaTime);
        print("d");

        }      
    }
    
    void rotation(){
        
        float mouseX = Input.GetAxis("Mouse X") * sensitivity * Time.fixedDeltaTime;
        float mouseY = Input.GetAxis("Mouse Y") * sensitivity * Time.fixedDeltaTime;

        Vector3 rot = transform.localRotation.eulerAngles;

        desiredX = rot.y + mouseX;
        xRotation -= mouseY;

        xRotation = Mathf.Clamp(xRotation, -90f, 90f);

        PlayerCam.transform.rotation = Quaternion.Euler(xRotation, desiredX, 0 );
        transform.localRotation = Quaternion.Euler(0, desiredX, 0);
    }

    void GroundCheck(){

        if (Physics.Raycast(transform.position, Vector3.down, distToGround + 0.1f)) {

            grounded = true;
            print("grounded");
        } else {grounded = false; print("not grounded");}
    }

    void jump(){

        if (Input.GetKeyDown("space") && grounded == true){

            rb.AddForce(Vector3.up * jumpforce * Time.fixedDeltaTime);
        }
    }
}

But the problem i’m having currently is that when the player (currently a capsule) is standing on a ledge, the raycast won’t detect that it’s grounded because the collider isn’t only in the middle. Maybe i should add more raycasts but i tought it was a good idea to ask for suggestions here. (If you have any other suggestions for my code it would also be appreciated).

this is a sreenshot of the problem:

[Captain_Pineapple]

Well this is a fairly common issue that is not that easy to solve if you want to stick to raycasts. An easier way that will give you more consistent results would be to use the OnCollision callbacks instead.

Check out this question here. The code in the question already implements the groundcheck using OnCollisionEnter and OnCollisionExit.
You should be able to implement that in your own script.

Let me know if that helped.