C# Scene.GetDescendants方法代码示例

//.........这里部分代码省略.........
      billboardNode.Name = null;
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      pose1.Position.Z -= 1;
      billboardNode = new BillboardNode(billboard);
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      pose1.Position.Z -= 1;
      billboardNode = new BillboardNode(billboard);
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      // ----- Axial, viewpoint-oriented billboards
      pose0.Position.X += 2;
      pose1 = pose0;
      billboard = new ImageBillboard(texture);
      billboard.Orientation = BillboardOrientation.AxialViewpointOriented;
      billboardNode = new BillboardNode(billboard);
      billboardNode.Name = "Axial, viewpoint-oriented";
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      pose1.Position.Z -= 1;
      billboardNode = new BillboardNode(billboard);
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      pose1.Position.Z -= 1;
      billboardNode = new BillboardNode(billboard);
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      pose1.Position.Z -= 1;
      billboardNode = new BillboardNode(billboard);
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      // ----- World-oriented billboards
      // World-oriented billboards have a fixed orientation in world space. The 
      // orientation is determine by the BillboardNode.
      pose0.Position.X += 2;
      pose1 = pose0;
      pose1.Orientation *= Matrix33F.CreateRotationY(0.2f);
      billboard = new ImageBillboard(texture);
      billboard.Orientation = BillboardOrientation.WorldOriented;
      billboardNode = new BillboardNode(billboard);
      billboardNode.Name = "World-oriented";
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      pose1.Position.Z -= 1;
      pose1.Orientation *= Matrix33F.CreateRotationY(0.2f);
      billboardNode = new BillboardNode(billboard);
      billboardNode.PoseWorld = pose1 * new Pose(Matrix33F.CreateRotationZ(MathHelper.ToRadians(15)));
      _scene.Children.Add(billboardNode);

      pose1.Position.Z -= 1;
      pose1.Orientation *= Matrix33F.CreateRotationY(0.2f);
      billboardNode = new BillboardNode(billboard);
      billboardNode.PoseWorld = pose1 * new Pose(Matrix33F.CreateRotationZ(MathHelper.ToRadians(30)));
      _scene.Children.Add(billboardNode);

      pose1.Position.Z -= 1;
      pose1.Orientation *= Matrix33F.CreateRotationY(0.2f);
      billboardNode = new BillboardNode(billboard);
      billboardNode.PoseWorld = pose1 * new Pose(Matrix33F.CreateRotationZ(MathHelper.ToRadians(45)));
      _scene.Children.Add(billboardNode);

      // ----- Animated billboards
      // DigitalRune Graphics supports "texture atlases". I.e. textures can be packed 
      // together into a single, larger texture file. A PackedTexture can describe a 
      // single texture packed into a texture atlas or a tile set packed into a 
      // texture atlas. In this example the "beeWingFlap" is a set of three tiles.
      // Tile sets can be used for sprite animations. (The animation is set below in 
      // Update().)
      pose0.Position.X += 2;
      pose1 = pose0;
      texture = new PackedTexture("Bee", ContentManager.Load<Texture2D>("Particles/beeWingFlap"), Vector2F.Zero, Vector2F.One, 3, 1);
      _animatedBillboard = new ImageBillboard(texture);
      billboardNode = new BillboardNode(_animatedBillboard);
      billboardNode.Name = "Animated billboards";
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      pose1.Position.Z -= 1;
      billboardNode = new BillboardNode(_animatedBillboard);
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      pose1.Position.Z -= 1;
      billboardNode = new BillboardNode(_animatedBillboard);
      billboardNode.PoseWorld = pose1;
      _scene.Children.Add(billboardNode);

      // Use DebugRenderer to draw node names above billboard nodes.
      foreach (var node in _scene.GetDescendants().OfType<BillboardNode>())
        _debugRenderer.DrawText(node.Name, node.PoseWorld.Position + new Vector3F(0, 1, 0), new Vector2F(0.5f), Color.Yellow, false);
    }

    private readonly LensFlareRenderer _lensFlareRenderer; // Handles LensFlareNodes.


    public LensFlareSample(Microsoft.Xna.Framework.Game game)
      : base(game)
    {
      SampleFramework.IsMouseVisible = false;
      var delegateGraphicsScreen = new DelegateGraphicsScreen(GraphicsService)
      {
        RenderCallback = Render,
      };
      GraphicsService.Screens.Insert(0, delegateGraphicsScreen);

      // Add a custom game object which controls the camera.
      _cameraObject = new CameraObject(Services);
      GameObjectService.Objects.Add(_cameraObject);

      // Create a new empty scene.
      _scene = new Scene();

      // Add the camera node to the scene.
      _scene.Children.Add(_cameraObject.CameraNode);

      // Add a few models to the scene.
      var ground = ContentManager.Load<ModelNode>("Ground/Ground").Clone();
      _scene.Children.Add(ground);

      var box = ContentManager.Load<ModelNode>("MetalGrateBox/MetalGrateBox").Clone();
      box.PoseLocal = new Pose(new Vector3F(0.5f, 0.5f, 0.5f), Matrix33F.CreateRotationY(0.1f));
      _scene.Children.Add(box);

      // Add some lights to the scene which have the same properties as the lights 
      // of BasicEffect.EnableDefaultLighting().
      SceneSample.InitializeDefaultXnaLights(_scene);

      // Add a lens flare for the sun light.
      var lensFlare = new LensFlare(true);  // The sun is a directional light source.
      lensFlare.Name = "Sun Flare";

      // The Size determines the screen size of the lens flare elements. The value
      // is relative to the viewport height.
      lensFlare.Size = 0.28f;       // 0.28 * viewport height

      // The QuerySize of a directional light is the estimated size relative to the 
      // viewport. This value is used in the hardware occlusion query, which determines 
      // whether the lens flare is visible.
      lensFlare.QuerySize = 0.18f;  // 0.18 * viewport height

      // All lens flare elements are packed into one texture ("texture atlas"). 
      // The PackedTexture identifies an element within the texture atlas.
      // See file Media/LensFlare/LensFlares.png.
      // (Credits: The sun lens flare was copied from the XNA racing game - http://exdream.com/XnaRacingGame/.)
      var lensFlareTexture = ContentManager.Load<Texture2D>("LensFlare/LensFlares");
      var circleTexture = new PackedTexture("Circle", lensFlareTexture, new Vector2F(0, 0), new Vector2F(0.25f, 0.5f));
      var glowTexture = new PackedTexture("Glow", lensFlareTexture, new Vector2F(0.25f, 0), new Vector2F(0.25f, 0.5f));
      var ringTexture = new PackedTexture("Ring", lensFlareTexture, new Vector2F(0.5f, 0), new Vector2F(0.25f, 0.5f));
      var haloTexture = new PackedTexture("Halo", lensFlareTexture, new Vector2F(0.75f, 0), new Vector2F(0.25f, 0.5f));
      var sunTexture = new PackedTexture("Sun", lensFlareTexture, new Vector2F(0, 0.5f), new Vector2F(0.25f, 0.5f));
      var streaksTexture = new PackedTexture("Streaks", lensFlareTexture, new Vector2F(0.25f, 0.5f), new Vector2F(0.25f, 0.5f));
      var flareTexture = new PackedTexture("Flare", lensFlareTexture, new Vector2F(0.5f, 0.5f), new Vector2F(0.25f, 0.5f));

      // Add a few elements (circles, glow, rings, halos, streaks, ...) to the lens flare. 
      lensFlare.Elements.Add(new LensFlareElement(-0.2f, 0.55f, 0.0f, new Color(175, 175, 255, 20), new Vector2F(0.5f, 0.5f), circleTexture));
      lensFlare.Elements.Add(new LensFlareElement(0.0f, 0.9f, 0.0f, new Color(255, 255, 255, 255), new Vector2F(0.5f, 0.5f), sunTexture));
      lensFlare.Elements.Add(new LensFlareElement(0.0f, 1.8f, 0.0f, new Color(255, 255, 255, 128), new Vector2F(0.5f, 0.5f), streaksTexture));
      lensFlare.Elements.Add(new LensFlareElement(0.0f, 2.6f, 0.0f, new Color(255, 255, 200, 64), new Vector2F(0.5f, 0.5f), glowTexture));
      lensFlare.Elements.Add(new LensFlareElement(0.5f, 0.12f, 0.0f, new Color(60, 60, 180, 35), new Vector2F(0.5f, 0.5f), circleTexture));
      lensFlare.Elements.Add(new LensFlareElement(0.55f, 0.46f, 0.0f, new Color(100, 100, 200, 60), new Vector2F(0.5f, 0.5f), circleTexture));
      lensFlare.Elements.Add(new LensFlareElement(0.6f, 0.17f, 0.0f, new Color(120, 120, 220, 40), new Vector2F(0.5f, 0.5f), circleTexture));
      lensFlare.Elements.Add(new LensFlareElement(0.85f, 0.2f, 0.0f, new Color(60, 60, 255, 100), new Vector2F(0.5f, 0.5f), ringTexture));
      lensFlare.Elements.Add(new LensFlareElement(1.5f, 0.2f, 0.0f, new Color(255, 60, 60, 130), new Vector2F(0.5f, 0.5f), flareTexture));
      lensFlare.Elements.Add(new LensFlareElement(0.15f, 0.15f, 0.0f, new Color(255, 60, 60, 90), new Vector2F(0.5f, 0.5f), flareTexture));
      lensFlare.Elements.Add(new LensFlareElement(1.3f, 0.6f, 0.0f, new Color(60, 60, 255, 180), new Vector2F(0.5f, 0.5f), haloTexture));
      lensFlare.Elements.Add(new LensFlareElement(1.4f, 0.2f, 0.0f, new Color(220, 80, 80, 98), new Vector2F(0.5f, 0.5f), haloTexture));
      lensFlare.Elements.Add(new LensFlareElement(1.5f, 0.1f, 0.0f, new Color(220, 80, 80, 85), new Vector2F(0.5f, 0.5f), circleTexture));
      lensFlare.Elements.Add(new LensFlareElement(1.6f, 0.5f, 0.0f, new Color(60, 60, 255, 80), new Vector2F(0.5f, 0.5f), haloTexture));
      lensFlare.Elements.Add(new LensFlareElement(1.8f, 0.3f, 0.0f, new Color(90, 60, 255, 110), new Vector2F(0.5f, 0.5f), ringTexture));
      lensFlare.Elements.Add(new LensFlareElement(1.95f, 0.5f, 0.0f, new Color(60, 60, 255, 120), new Vector2F(0.5f, 0.5f), haloTexture));
      lensFlare.Elements.Add(new LensFlareElement(2.0f, 0.15f, 0.0f, new Color(60, 60, 255, 85), new Vector2F(0.5f, 0.5f), circleTexture));

      // The scene node "KeyLight" (defined in SceneSample.InitializeDefaultXnaLights())
      // is the main directional light source. 
      var keyLightNode = _scene.GetDescendants().First(n => n.Name == "KeyLight");

      // Let's attach the lens flare to the "KeyLight" node. 
      // (Note: It is not necessary to attach a lens flare to a light node. Lens flares
      // can be added anywhere within the scene. But attaching the lens flare to the
      // light node ensures that the lens flare always has the same position and direction 
      // as the light source.)
      var lensFlareNode = new LensFlareNode(lensFlare);
      keyLightNode.Children = new SceneNodeCollection();
      keyLightNode.Children.Add(lensFlareNode);

      // Add a second lens flare. 
      // The previous lens flare was a caused by a directional light source (distance = infinite). 
      // This time we add a local lens flare.
      lensFlare = new LensFlare(false);
      lensFlare.Name = "Anamorphic Flare";
      lensFlare.Size = 0.3f;      // 0.3 * viewport height

//.........这里部分代码省略.........