3DTD/Assets/Scripts/Camera/HideWall.cs

using System.Collections.Generic;
using UnityEngine;

public class HideWall : MonoBehaviour
{
    [SerializeField] private GameObject target;
    [SerializeField] private GameObject origin;

    [Range(1f, 10f)] public float hideFadeSpeed;
    [Range(1f, 10f)] public float showFadeSpeed;

    public float sphereRadius;
    [Range(0, 10)] public float sphereRange;
    public Vector3 sphereOffset;

    float maxSphereRayDistance;
    private List<GameObject> prevHitObjects = new List<GameObject>();

    void Update()
    {
        maxSphereRayDistance = Vector3.Distance(origin.transform.position, target.transform.position) - (sphereRadius * 2) + sphereRange;

        Vector3 direction = ((target.transform.position + sphereOffset) - origin.transform.position).normalized;
        RaycastHit[] hits = Physics.SphereCastAll(origin.transform.position, sphereRadius, direction, maxSphereRayDistance);

        List<GameObject> hitObjectsThisFrame = new List<GameObject>();


        for (int i = 0; i < hits.Length; i++)
        {
            //print(hits[i].collider.gameObject.name);
            if (hits[i].collider != null)
            {
                var hitGameObject = hits[i].collider.gameObject;
                hitObjectsThisFrame.Add(hitGameObject);

                var wallOpacity = hitGameObject.GetComponent<WallOpacity>();
                if (wallOpacity != null && !prevHitObjects.Contains(hitGameObject))
                {
                    wallOpacity.HideWall(hideFadeSpeed);
                }
            }
        }

        foreach (var prevHitObject in prevHitObjects)
        {
            if (!hitObjectsThisFrame.Contains(prevHitObject))
            {
                var wallOpacity = prevHitObject.GetComponent<WallOpacity>();
                if (wallOpacity != null)
                {
                    wallOpacity.ShowWall(showFadeSpeed);
                }
            }
        }

        prevHitObjects = hitObjectsThisFrame;
    }

    private void OnDrawGizmos()
    {
        Gizmos.color = Color.red;
        Gizmos.DrawWireSphere(origin.transform.position, sphereRadius);
    }
}