C# Camera.ScreenToWorldPoint方法代碼示例

    float rightBoundary; //right boundary of screen

    #endregion Fields

    #region Methods

    void Awake()
    {
        playerRef = GameObject.FindGameObjectWithTag ("Player").transform;
        mainCam = Camera.main;
        leftBoundary = mainCam.ScreenToWorldPoint(new Vector3(0f, 0f, 0f)).x - offset;
        rightBoundary = mainCam.ScreenToWorldPoint(new Vector3(Screen.width, 0f, 0f)).x + offset;
    }

    public static Mesh CreateFullScreenQuadMesh(Camera camera)
    {
        float z = 10;

        // 0 - 1
        // 2 - 3

        Vector3[] verts = new Vector3[4];
        verts [0] = camera.ScreenToWorldPoint (new Vector3 (0, 0, z));
        verts [1] = camera.ScreenToWorldPoint (new Vector3 (camera.pixelWidth, 0, z));
        verts [2] = camera.ScreenToWorldPoint (new Vector3 (0, camera.pixelHeight, z));
        verts [3] = camera.ScreenToWorldPoint (new Vector3 (camera.pixelWidth, camera.pixelHeight, z));

        Vector2[] uvs = new Vector2[4];
        uvs [0] = new Vector2 (0f, 0f);
        uvs [1] = new Vector2 (1f, 0f);
        uvs [2] = new Vector2 (0f, 1f);
        uvs [3] = new Vector2 (1f, 1f);

        int[] tris = new int[6] { 2, 1, 0, 3, 1, 2 };

        Mesh mesh = new Mesh ();
        mesh.vertices = verts;
        mesh.uv = uvs;
        mesh.triangles = tris;
        mesh.RecalculateNormals ();

        return mesh;
    }

	// This function is used by camBounds to set _camBounds and can also be
	// called directly
	public static void SetCameraBounds(Camera cam = null) {
		// If no Camera, use the main camera
		if (cam == null) cam = Camera.main;
		// This makes a couple of important assumptions about the camera
		// 1. Camera is orthographic
		// 2. Camera is at a rotation of R:[0,0,0]

		// Make Vector3s at the topLeft and bottomRight of the screen coords
		Vector3 topLeft = new Vector3(0,0,0);
		Vector3 bottomRight = new Vector3 (Screen.width, Screen.height, 0);

		// Convert these to world coordinates
		Vector3 boundTLN = cam.ScreenToWorldPoint(topLeft);
		Vector3 boundBRF = cam.ScreenToWorldPoint (bottomRight);

		// Adjust their zs to be at the near and far camera clipping planes
		boundTLN.z += cam.nearClipPlane;
		boundBRF.z += cam.farClipPlane;

		// Find the center of the Bounds
		Vector3 center = (boundTLN + boundBRF)/2f;
		_camBounds = new Bounds (center, Vector3.zero);
		// Expand _camBounds to encapsulate the extents.
		_camBounds.Encapsulate(boundTLN);
		_camBounds.Encapsulate (boundBRF);
	}

    void Start()
    {
        mainCamera = GetComponent<Camera> ();
        //Create a Dictionary to contain all our Objects/Transforms
        System.Collections.Generic.Dictionary<string,Transform> colliders = new System.Collections.Generic.Dictionary<string,Transform>();
        //Create our GameObjects and add their Transform components to the Dictionary we created above
        colliders.Add("Top",new GameObject().transform);
        colliders.Add("Bottom",new GameObject().transform);
        colliders.Add("Right",new GameObject().transform);
        colliders.Add("Left",new GameObject().transform);
        //Generate world space point information for position and scale calculations
        Vector3 cameraPos = mainCamera.transform.position;
        screenSize.x = Vector3.Distance (mainCamera.ScreenToWorldPoint(new Vector3(0,0,-cameraPos.z)),mainCamera.ScreenToWorldPoint(new Vector3(Screen.width, 0,-cameraPos.z))) * 0.5F; //Grab the world-space position values of the start and end positions of the screen, then calculate the distance between them and store it as half, since we only need half that value for distance away from the camera to the edge
        screenSize.y = Vector3.Distance (mainCamera.ScreenToWorldPoint(new Vector3(0,0,-cameraPos.z)),mainCamera.ScreenToWorldPoint(new Vector3(0, Screen.height,-cameraPos.z))) * 0.5F;
        //For each Transform/Object in our Dictionary
        foreach(KeyValuePair<string,Transform> valPair in colliders){
            valPair.Value.gameObject.AddComponent<BoxCollider>().material = physicsMaterial; //Add our colliders. Remove the "2D", if you would like 3D colliders.
            valPair.Value.name = valPair.Key + "Collider"; //Set the object's name to it's "Key" name, and take on "Collider".  i.e: TopCollider
            valPair.Value.parent = transform; //Make the object a child of whatever object this script is on (preferably the camera)

            if(valPair.Key == "Left" || valPair.Key == "Right") //Scale the object to the width and height of the screen, using the world-space values calculated earlier
                valPair.Value.localScale = new Vector3(colThickness, screenSize.y * 2, 10*colThickness);
            else
                valPair.Value.localScale = new Vector3(screenSize.x * 2, 10*colThickness, colThickness);
        }
        //Change positions to align perfectly with outter-edge of screen, adding the world-space values of the screen we generated earlier, and adding/subtracting them with the current camera position, as well as add/subtracting half out objects size so it's not just half way off-screen
        colliders["Right"].position = new Vector3(cameraPos.x + screenSize.x + (colliders["Right"].localScale.x * 0.5f), cameraPos.y, zPosition);
        colliders["Left"].position = new Vector3(cameraPos.x - screenSize.x - (colliders["Left"].localScale.x * 0.5f), cameraPos.y, zPosition);
        colliders["Top"].position = new Vector3(cameraPos.x, cameraPos.y + screenSize.y + (colliders["Top"].localScale.y * 0.5f), zPosition);
        colliders["Bottom"].position = new Vector3(cameraPos.x, cameraPos.y - screenSize.y - (colliders["Bottom"].localScale.y * 0.5f), zPosition);
    }

 //Runs as soon as the program starts
 void Start()
 {
     mainCamera = FindObjectOfType<Camera> ();
     gameManager = FindObjectOfType<GameManager> ();
     StartingLocation ();
     topWall = (new Vector3 (0f,mainCamera.ScreenToWorldPoint(new Vector3 (0f, Screen.height,0f)).y,0).y) - (transform.localScale.y);
     bottomWall =  (new Vector3 (0f,mainCamera.ScreenToWorldPoint(new Vector3 (0f, 0f ,0f)).y).y) + (transform.localScale.y);
 }

 // Use this for initialization
 void Start()
 {
     target = GameMain.Instance.playerObject;
     transform.position = target.transform.position;
     camera = GetComponent<Camera>();
     cameraSize = new Vector3 (0,0,0);
     cameraSize.x = transform.position.x - camera.ScreenToWorldPoint(new Vector3(0,0,0)).x;
     cameraSize.y = transform.position.y - camera.ScreenToWorldPoint(new Vector3(0,0,0)).y;
 }

    void OnDrawGizmos()
    {
        focusedCamera = camera;

        topRight = focusedCamera.ScreenToWorldPoint(new Vector3(focusedCamera.pixelWidth, focusedCamera.pixelHeight, focusedCamera.nearClipPlane));
        bottomRight  = focusedCamera.ScreenToWorldPoint(new Vector3(focusedCamera.pixelWidth, 0, focusedCamera.nearClipPlane));
        topLeft = focusedCamera.ScreenToWorldPoint(new Vector3(0, focusedCamera.pixelHeight, focusedCamera.nearClipPlane));
        bottomLeft = focusedCamera.ScreenToWorldPoint(new Vector3(0, 0, focusedCamera.nearClipPlane)) ;
        Vector3 offset = (focusedCamera.transform.forward * screenSurfaceDepth);

        if(displayScreenInformation){
            Gizmos.color = Color.blue;

            if(displayTextInformation)
                Gizmos.DrawIcon((topLeft + bottomRight) * 0.5F, "CloseClippingPlane.png");

            Gizmos.DrawLine(topLeft, topRight);
            Gizmos.DrawLine(topRight, bottomRight);
            Gizmos.DrawLine(bottomRight, bottomLeft);
            Gizmos.DrawLine(bottomLeft, topLeft);

            Gizmos.color = Color.cyan;

            if(displayTextInformation)
                Gizmos.DrawIcon(((topLeft + offset) + (bottomRight + offset)) * 0.5F, "ScreenSpace.png");

            Gizmos.DrawLine(topLeft + offset, topRight + offset);
            Gizmos.DrawLine(topRight + offset, bottomRight + offset);
            Gizmos.DrawLine(bottomRight + offset, bottomLeft + offset);
            Gizmos.DrawLine(bottomLeft + offset, topLeft + offset);
        }

        if(displayGuideInformation){
            Gizmos.color = Color.yellow;
            drawFlatForwardLine(bottomLeft + offset, 1);
            drawFlatForwardLine(bottomRight + offset, 1);
            drawLineFromCameraPastPoint(topLeft, 1);
            drawLineFromCameraPastPoint(topRight, 1);
            drawLineFromCameraPastPoint(bottomLeft, 1);
            drawLineFromCameraPastPoint(bottomRight, 1);

            drawFlatForwardLine(slidePointDownCameraEdge(bottomLeft, floorDepth), 1);
            drawFlatForwardLine(slidePointDownCameraEdge(bottomRight, floorDepth), 1);
        }

        if(displayFloorInformation){
            Gizmos.color = FloorColor;
            drawFloorExample(slidePointDownCameraEdge(bottomRight, floorDepth), slidePointDownCameraEdge(bottomLeft, floorDepth), 1);
        }
    }

	// Use this for initialization
	void Start () {
        Player = GameObject.FindWithTag("Player");
        rb = GetComponent<Rigidbody>();
        camera = Camera.main;
        Debug.Log("Yo Camera Bound");

        var bottomLeft = camera.ScreenToWorldPoint(Vector3.zero);
        var topRight = camera.ScreenToWorldPoint(new Vector3(
            camera.pixelWidth, camera.pixelHeight));
        cameraRect = new Rect(
            bottomLeft.x,
            bottomLeft.y,
            topRight.x - bottomLeft.x,
            topRight.y - bottomLeft.y);
    }

 void Update()
 {
     cam = Camera.main;
     mousePosition = Input.mousePosition;
     mousePosition = cam.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,Input.mousePosition.y, Input.mousePosition.z - cam.transform.position.z));
     transform.eulerAngles = new Vector3(0,0,Mathf.Atan2((mousePosition.y - transform.position.y), (mousePosition.x - transform.position.x))*Mathf.Rad2Deg);
 }

	void Start ()
	{
		mainCamera = GameObject.FindGameObjectWithTag ("MainCamera").GetComponent<Camera> ();
		upperCorner = new Vector3 (Screen.width, Screen.height, 0.0f);
		upperCorner = mainCamera.ScreenToWorldPoint(upperCorner);
		//Debug.Log ("upper corner: " + upperCorner);
	}

    public GameObject[] splitByLine(GameObject target, Camera camera, Vector3 _start, Vector3 _end, bool destroyOriginal)
    {
        Vector3 targetPositionRelativeToCamera = camera.transform.worldToLocalMatrix.MultiplyPoint3x4( target.transform.position );

        _start.z = targetPositionRelativeToCamera.z;
        _end.z = targetPositionRelativeToCamera.z;

        Vector3 _middle = (_start + _end) / 2f;
        _middle.z *= 2f;

        Vector3 start = camera.ScreenToWorldPoint(_start);
        Vector3 middle = camera.ScreenToWorldPoint(_middle);
        Vector3 end = camera.ScreenToWorldPoint(_end);

        return splitByTriangle(target, new[] { start, middle, end }, destroyOriginal );
    }

    private void GeneratePlanes()
    {
        cameraComponent = sceneCamera.GetComponent<Camera>();

        screenHeightInWorldUnits = cameraComponent.orthographicSize * 2;
        screenWidthInWorldUnits = screenHeightInWorldUnits * cameraComponent.aspect;

        for (int i = 0; i < numberOfHorizontalRectangles; i++)
            for (int j = 0; j < numberOfVerticalRectangles; j++)
            {
                Transform plane = GameObject.Instantiate(planePrefab);
                plane.GetComponent<Renderer>().material.color = new Color(0, 0, 0);

                //Set rotation
                plane.rotation = Quaternion.Euler(-90, 0, 0);

                //Set position
                float horizontalSpacing = cameraComponent.pixelWidth / numberOfHorizontalRectangles;
                float verticalSpacing = cameraComponent.pixelHeight / numberOfVerticalRectangles;
                plane.position = cameraComponent.ScreenToWorldPoint(new Vector3(horizontalSpacing * 0.5f + horizontalSpacing * i,
                                                                                          verticalSpacing * 0.5f + verticalSpacing * j,
                                                                                          1));

                //Set scale
                plane.localScale = new Vector3(1 * cameraComponent.aspect / numberOfHorizontalRectangles - spacingBetweenRectangles / 2,
                                                         1,
                                                         1f / numberOfVerticalRectangles - spacingBetweenRectangles / 2);

                planes.Add(plane);
            }
    }

        public override int Draw(Microsoft.Xna.Framework.Graphics.GraphicsDevice device, Camera cam)
        {
            if (ApplicationSettings.ShowDebugLines)
            {
                Debug.DrawLines(device, cam);
            }
            if (ApplicationSettings.ShowDebugPhysics)
            {
                Matrix proj = cam.projectionMatrix;
                Matrix view = cam.view;
                if (rayCastPlane.HasValue)
                {
                    if (rayCastPlane.Value.normal == Vector3.up)
                    {
                        view = Matrix.CreateRotationX(MathHelper.ToRadians(90)) * view;
                    }
                }

                physicsDebugView.RenderDebugData(ref proj, ref view, b => dontDrawColliders.Contains(b.UserData));

                // NOTE: This only works for XY plane stuff
                PressPlay.FFWD.Vector3 inPos = Input.mousePosition;
                inPos.z = cam.nearClipPlane;
                PressPlay.FFWD.Vector2 castPos = cam.ScreenToWorldPoint(inPos);
                if (rayCastPlane.HasValue)
                {
                    float dist;
                    Ray ray = Camera.main.ScreenPointToRay(inPos);
                    if (rayCastPlane.Value.Raycast(ray, out dist))
                    {
                        Vector3 pt = ray.GetPoint(dist);
                        castPos = new Vector2(pt.x, pt.z);
                    }
                    else
                    {
                        castPos = Vector2.zero;
                    }
                }
                Debug.Display("Mouse / Physics", inPos + " / " + castPos);

                RaycastHit[] hits = Physics.PointcastAll(castPos, cam.cullingMask);
                if (hits.Length > 0)
                {
                    Debug.Display("Over", String.Join("\n", hits.Select(h => h.collider.ToString()).OrderBy(s => s).ToArray()));
                }
                else
                {
                    Debug.Display("Over", "");
                }
            }

            if(ApplicationSettings.ShowDebugPhysicsCustom)
            {
                Physics.DrawDebug();
            }
            return 0;
        }

    public static void SetCameraBounds(Camera cam = null)
    {
        if (cam == null) cam = Camera.main;

        Vector3 topLeft = new Vector3(0, 0, 0);
        Vector3 bottomRight = new Vector3(Screen.width, Screen.height, 0);

        Vector3 boundTLN = cam.ScreenToWorldPoint(topLeft);
        Vector3 boundBRF = cam.ScreenToWorldPoint(bottomRight);

        boundTLN.z += cam.nearClipPlane;
        boundBRF.z += cam.farClipPlane;

        Vector3 center = (boundTLN + boundBRF) / 2f;
        _camBounds = new Bounds(center, Vector3.zero);
        _camBounds.Encapsulate(boundBRF);
        _camBounds.Encapsulate(boundTLN);
    }

    /// <summary>
    ///   get relative mouse position under parent node
    ///   the camera must be orthometric
    /// </summary>
    static public Vector3 GetRelativeMousePosition(Camera camera, Transform parent)
    {
        Vector3 v = camera.ScreenToWorldPoint(Input.mousePosition);//screen position to world position
        if (parent!=null)
            v = parent.InverseTransformPoint(v);//world position to local position

        v.z = 0;//flat z 
        return v;
    }