Checking for Raycast distances not working as expected.

Hey Guys,

I am programming a 2D game where you can move a sprite in a room and can dash from wall to wall by clicking in the direction you want to go. Everything is working fine and I'm onto optimising things. One of which is that you can click behind a wall the character is attachted to and it will try to go there.

My solution to this is to send Raycasts from the character towards the mouse position and check whether a the hit occurs after a certain distance. One Ray however does not seem to work especially around corners. So I thought of making a row of raycast which individually fire towards the mouse click with a maxDistance. Then I add them up and see if they are lower than the value that they would have if every Ray fired without being blocked. If so then some ray must have been obstructed and not allow for move.

Somehow it does not work and maybe you can figure out what it is. Maybe it has something to do with calculating the position of every ray and the spacing. Important parts are the FixedUpdate and ValidateMove Functions.

Looking forward to your suggestions!

SirSmileX

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Movement : MonoBehaviour {
 
     public float dashSpeed = 10f;
 
     public bool canMove = true;
 
     public int rayCount = 5;
     public float maxWallDistance = 1.0f;
 
     private bool isClicked = false;
     private Rigidbody2D rb;
     private GameManager gm;
     private BoxCollider2D notClickable;
     private RaycastHit2D[] hits;
 
     void Start ()
     {
         rb = GetComponent<Rigidbody2D>();
         gm = Camera.main.GetComponent<GameManager>();
         notClickable = GetComponentInChildren<BoxCollider2D>();
     }
 
     void FixedUpdate ()
     {
         if (Input.GetMouseButtonDown(0) && canMove)
         {
             if (!isClicked) {
                 if (ValidateMove())
                 {
                     canMove = false;
                     notClickable.enabled = false;
                     
                     Vector2 direction = (Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position);
                     rb.AddForce(direction.normalized * dashSpeed);
 
                     float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
                     transform.rotation = Quaternion.AngleAxis(angle - 90f, Vector3.forward);
                 }
             }
         }
     }
 
     private bool ValidateMove()
     {
         Vector2 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
 
         hits = new RaycastHit2D[rayCount];
 
         float totalDistance = 0.0f;
 
         float spacing = 0.5f / rayCount;
         for (int i = 0; i < rayCount; i++)
         {
             Vector2 position = new Vector2(transform.position.x - 0.25f + spacing * i, transform.position.y) * transform.up;
             hits[i] = Physics2D.Raycast(position, (mousePosition - position).normalized, maxWallDistance + 0.01f);
             totalDistance += hits[i].distance;
         }
         if (totalDistance <= maxWallDistance * (float)rayCount)
         {
             return false;
         }
         return true;
     }
 
     private void OnCollisionEnter2D(Collision2D collision)
     {
         if (collision.gameObject.CompareTag("isEnvironment"))
         {
             rb.velocity = Vector2.zero;
             Vector2 contactPoint = collision.contacts[0].normal;
             transform.rotation = Quaternion.FromToRotation(Vector2.up, new Vector2(contactPoint.x, contactPoint.y));
             notClickable.enabled = true;
             canMove = true;
         }
     }
 
     private void OnTriggerEnter2D(Collider2D collision)
     {
         if (collision.gameObject.CompareTag("isBlob"))
         {
             Destroy(collision.gameObject);
             gm.score++;
         }
 
         if (collision.gameObject.CompareTag("isBomb"))
         {
             rb.velocity = Vector2.zero;
             StartCoroutine(gm.Restart());
         }
     }
 
     private void OnMouseOver()
     {
         isClicked = true;
     }
 
     private void OnMouseExit()
     {
         isClicked = false;
     }
 }