public override void Update(GameTime gameTime)
{
// Move the directional light in a circle.
float deltaTimeF = (float)gameTime.ElapsedGameTime.TotalSeconds;
_lightAngle += 0.3f * deltaTimeF;
var position = Quaternion.CreateRotationY(_lightAngle).Rotate(new Vector3(6, 6, 0));
// Make the light look at the world space origin.
var lightTarget = Vector3.Zero;
var lookAtMatrix = Matrix.CreateLookAt(position, lightTarget, Vector3.Up);
// A look-at matrix is the inverse of a normal world or pose matrix.
_mainDirectionalLightNode.PoseWorld =
new Pose(lookAtMatrix.Translation, lookAtMatrix.Minor).Inverse;
// Compute shadow matrix for the new light direction.
var lightRayDirection = (lightTarget - position);
_shadowMatrix = ProjectedShadowRenderer.CreateShadowMatrix(
new Plane(new Vector3(0, 1, 0), 0.01f), new Vector4(-lightRayDirection, 0));
// Update the scene - this must be called once per frame.
_scene.Update(gameTime.ElapsedGameTime);
base.Update(gameTime);
}
public ProjectedShadowSample(Microsoft.Xna.Framework.Game game)
: base(game)
{
SampleFramework.IsMouseVisible = false;
var delegateGraphicsScreen = new DelegateGraphicsScreen(GraphicsService)
{
RenderCallback = Render,
};
GraphicsService.Screens.Insert(0, delegateGraphicsScreen);
// Create a new empty scene.
_scene = new Scene();
Services.Register(typeof(IScene), null, _scene);
// Add a custom game object which controls the camera.
_cameraObject = new CameraObject(Services);
_cameraObject.ResetPose(new Vector3F(-8, 6, 8), -ConstantsF.PiOver4, -0.4f);
GameObjectService.Objects.Add(_cameraObject);
// Add a default light setup (ambient light + 3 directional lights).
var defaultLightsObject = new DefaultLightsObject(Services);
GameObjectService.Objects.Add(defaultLightsObject);
// Get the main directional light.
_mainDirectionalLightNode = ((LightNode)_scene.GetSceneNode("KeyLight"));
// Add a ground plane model to the scene graph.
var grid = ContentManager.Load<ModelNode>("Ground/Ground").Clone();
grid.ScaleLocal = new Vector3F(0.3f);
_scene.Children.Add(grid);
// Add a tank model to the scene graph.
var tank = ContentManager.Load<ModelNode>("Tank/tank").Clone();
_scene.Children.Add(tank);
// Remember the mesh nodes of tank node.
_tankMeshNodes = tank.GetSubtree().Where(n => n is MeshNode).ToArray();
// Create the renderers.
_meshRenderer = new MeshRenderer();
var spriteFont = UIContentManager.Load<SpriteFont>("UI Themes/BlendBlue/Default");
_debugRenderer = new DebugRenderer(GraphicsService, spriteFont);
_projectedShadowRenderer = new ProjectedShadowRenderer(GraphicsService)
{
// The plane onto which the shadows are projected. It is positioned a bit above the ground
// plane to avoid z-fighting.
ShadowedPlane = new Plane(new Vector3F(0, 1, 0), 0.01f),
// The shadow color is a transparent black.
ShadowColor = new Vector4F(0, 0, 0, 0.4f),
// The light position is set in Update().
//LightPosition = ...
};
}
public ProjectedShadowSample(Microsoft.Xna.Framework.Game game)
: base(game)
{
SampleFramework.IsMouseVisible = false;
var delegateGraphicsScreen = new DelegateGraphicsScreen(GraphicsService)
{
RenderCallback = Render,
};
GraphicsService.Screens.Insert(0, delegateGraphicsScreen);
// Create a new empty scene.
_scene = new Scene();
Services.Register(typeof(IScene), null, _scene);
// Add a custom game object which controls the camera.
_cameraObject = new CameraObject(Services);
_cameraObject.ResetPose(new Vector3F(-8, 6, 8), -ConstantsF.PiOver4, -0.4f);
GameObjectService.Objects.Add(_cameraObject);
// Add a default light setup (ambient light + 3 directional lights).
var defaultLightsObject = new DefaultLightsObject(Services);
GameObjectService.Objects.Add(defaultLightsObject);
// Get the main directional light.
_mainDirectionalLightNode = ((LightNode)_scene.GetSceneNode("KeyLight"));
// Add a ground plane model to the scene graph.
var grid = ContentManager.Load <ModelNode>("Ground/Ground").Clone();
grid.ScaleLocal = new Vector3F(0.3f);
_scene.Children.Add(grid);
// Add a tank model to the scene graph.
var tank = ContentManager.Load <ModelNode>("Tank/tank").Clone();
_scene.Children.Add(tank);
// Remember the mesh nodes of tank node.
_tankMeshNodes = tank.GetSubtree().Where(n => n is MeshNode).ToArray();
// Create the renderers.
_meshRenderer = new MeshRenderer();
var spriteFont = UIContentManager.Load <SpriteFont>("UI Themes/BlendBlue/Default");
_debugRenderer = new DebugRenderer(GraphicsService, spriteFont);
_projectedShadowRenderer = new ProjectedShadowRenderer(GraphicsService)
{
// The plane onto which the shadows are projected. It is positioned a bit above the ground
// plane to avoid z-fighting.
ShadowedPlane = new Plane(new Vector3F(0, 1, 0), 0.01f),
// The shadow color is a transparent black.
ShadowColor = new Vector4F(0, 0, 0, 0.4f),
// The light position is set in Update().
//LightPosition = ...
};
}
