Viewcone

viewcone.cs

using UnityEngine;

public class Viewcone : MonoBehaviour
{
    static readonly int alertScaleID = Shader.PropertyToID("_AlertScale");
    static readonly int farViewDistanceID = Shader.PropertyToID("_FarViewDistance");
    static readonly int isAttackingID = Shader.PropertyToID("_IsAttacking");
    static readonly int nearViewDistanceID = Shader.PropertyToID("_NearViewDistance");
    static readonly int originYID = Shader.PropertyToID("_OriginY");
    static readonly int viewAngleID = Shader.PropertyToID("_ViewAngle");
    static readonly int viewDepthTexturedID = Shader.PropertyToID("_ViewDepthTexture");
    static readonly int viewSpaceMatrixID = Shader.PropertyToID("_ViewSpaceMatrix");

    public Enemy enemy; // TODO get rid of this ref

    [SerializeField] Camera cam;
    [SerializeField] Transform container;
    [SerializeField] GameObject mesh;
    int storiesAbove { get; set; } = 1;
    int storiesBelow { get; set; } = 2;

    Material material;

    public void SetEnemy(Enemy e, bool force = false)
    {
        if (enemy && !force)
        {
            return;
        }

        enemy = e;
        gameObject.SetActive(true);
    }

    public void ClearEnemy(Enemy e)
    {
        if (enemy == e)
        {
            enemy = null;
            gameObject.SetActive(false);
        }
    }

    void Awake()
    {
        cam.targetTexture = new RenderTexture(cam.pixelWidth, cam.pixelHeight, 32, RenderTextureFormat.Depth); // TODO adjust to 24bit depth buffer for perf?
        cam.aspect = 1;

        var meshRenderer = mesh.GetComponent<MeshRenderer>();

        material = meshRenderer.material;  // generate a copy of the material
        material.SetTexture(viewDepthTexturedID, cam.targetTexture);

        meshRenderer.material = material;
    }

    void Start()
    {
        gameObject.SetActive(false);
    }

    void Update()
    {
        if (!enemy)
        {
            return;
        }

        container.localRotation = Quaternion.Euler(0, enemy.viewconeRotation, 0);

        transform.position = enemy.transform.position;
        transform.rotation = enemy.transform.rotation;

        cam.fieldOfView = enemy.viewconeFov;
        cam.farClipPlane = enemy.viewconeFarRange;

        var meshSize = enemy.viewconeFarRange * 2;
        var meshHeight = (storiesAbove + storiesBelow) * 3;
        var meshOffset = -(meshHeight / 2) + (storiesAbove * 3);

        mesh.transform.localScale = new Vector3(meshSize, meshHeight, meshSize);
        mesh.transform.localPosition = new Vector3(0, meshOffset, 0);

        // material.SetFloat(isAttackingID, enemy.isAttacking == 1 ? 1 : 0);
        material.SetFloat(alertScaleID, enemy.viewconeAlertScale * 0.5f);
        material.SetFloat(viewAngleID, enemy.viewconeFov);
        material.SetFloat(nearViewDistanceID, enemy.viewconeNearRange);
        material.SetFloat(farViewDistanceID, enemy.viewconeFarRange);
        material.SetFloat(originYID, transform.position.y);
        material.SetMatrix(viewSpaceMatrixID, cam.projectionMatrix * cam.worldToCameraMatrix);
    }
}