protected override void Initialise()
{
//setup ambient lighting
this.ambientLight = new MaterialLightCollection();
ambientLight.LightingEnabled = true;
ambientLight.AmbientLightColour = new Vector3(0.25f, 0.25f, 0.25f);
ambientLight.AddDirectionalLight(false, new Vector3(-1, -1, 0), new Vector3(2, 2, 2)); // add some backlighting
//setup the shadow render camera
Camera3D shadowCamera = new Camera3D();
shadowCamera.LookAt(new Vector3(1, 1, 3), new Vector3(-15, 20, 20), new Vector3(0, 0, 1));
//set the clip plane distances
shadowCamera.Projection.FarClip = 40;
shadowCamera.Projection.NearClip = 20;
shadowCamera.Projection.FieldOfView *= 0.25f;
//8bit is actually enough accuracy for this sample (given the limited range of the shadow)
SurfaceFormat textureFormat = SurfaceFormat.Color;
const int resolution = 512;
//create the shadow map texture:
drawShadowDepth = new DrawTargetTexture2D(shadowCamera, resolution, resolution, textureFormat, DepthFormat.Depth24);
drawShadowDepth.ClearBuffer.ClearColour = Color.White;
//for the shadow technique used, the shadow buffer is blurred.
//this requires an intermediate render target on the PC
DrawTargetTexture2D blurIntermediate = null;
#if !XBOX360
//not required on the xbox if the render target is small enough to fit in EDRAM in one tile
blurIntermediate = new DrawTargetTexture2D(shadowCamera, resolution, resolution, textureFormat);
#endif
//create a blur filter
shadowDepthBlurFilter = new Xen.Ex.Filters.BlurFilter(Xen.Ex.Filters.BlurFilterFormat.SevenSampleBlur, 1.0f, drawShadowDepth, blurIntermediate);
//create the scene camera
Camera3D camera = new Camera3D();
camera.LookAt(new Vector3(0, 0, 3), new Vector3(10, 10, 6), new Vector3(0, 0, 1));
camera.Projection.FieldOfView *= 0.55f;
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.Black;
//the 'scene'
//A DrawList from Tutorial 23 is used here, this stores the 'scene',
//which is just a set of actors and the ground
Tutorials.Tutorial_23.DrawList scene = new Tutorials.Tutorial_23.DrawList();
for (int x = 0; x < 2; x++)
{
for (int y = 0; y < 2; y++)
{
//create the actor instances
if (x != 0 || y != 0)
{
scene.Add(new Actor(this.Content, new Vector3(x * 6 - 3, y * 6 - 3, 0), (x + y * 2 + 1) * 0.1f, 4 - x * 2 - y));
}
}
}
//add the ground
GroundDisk ground = new GroundDisk(this.Content, 10, ambientLight);
scene.Add(ground);
//setup the draw targets...
//create the shader provider
ShadowOutputShaderProvider shadowOutputShaderProvider = new ShadowOutputShaderProvider();
//add a ShadowMapDrawer to the shadow map texture
drawShadowDepth.Add(new ShadowMapDrawer(scene, shadowOutputShaderProvider));
//setup the scene to be drawn to the screen
//draw the scene normally (no shadow, just ambient)
drawToScreen.Add(scene);
//then draw the scene with a shadow (blended on top)
drawToScreen.Add(new ShadowedSceneDrawer(scene, shadowOutputShaderProvider, drawShadowDepth));
//add a nice faded background
Tutorial_20.BackgroundGradient background = new Tutorial_20.BackgroundGradient(Color.WhiteSmoke, Color.Black);
background.DrawAtMaxZDepth = true;
drawToScreen.Add(background);
//create a textured element that will display the shadow map texture
TexturedElement shadowDepthDisplay = new TexturedElement(drawShadowDepth, new Vector2(256, 256));
shadowDepthDisplay.VerticalAlignment = VerticalAlignment.Top;
this.drawToScreen.Add(shadowDepthDisplay);
}
