private void RenderShadowMap(PointLight pointLight)
{
Matrix[] views = new Matrix[6];
views[0] = Matrix.CreateLookAt(pointLight.Position, pointLight.Position + Vector3.Forward, Vector3.Up);
views[1] = Matrix.CreateLookAt(pointLight.Position, pointLight.Position + Vector3.Backward, Vector3.Up);
views[2] = Matrix.CreateLookAt(pointLight.Position, pointLight.Position + Vector3.Left, Vector3.Up);
views[3] = Matrix.CreateLookAt(pointLight.Position, pointLight.Position + Vector3.Right, Vector3.Up);
views[4] = Matrix.CreateLookAt(pointLight.Position, pointLight.Position + Vector3.Down, Vector3.Forward);
views[5] = Matrix.CreateLookAt(pointLight.Position, pointLight.Position + Vector3.Up, Vector3.Backward);
Matrix projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(90.0f), 1.0f, 0.1f, pointLight.Radius);
this.DepthWriterEffect.Parameters["Projection"].SetValue(projection);
this.DepthWriterEffect.Parameters["LightPosition"].SetValue(pointLight.Position);
this.DepthWriterEffect.Parameters["DepthPrecision"].SetValue(pointLight.Radius);
// Forward
this.GraphicsDevice.SetRenderTarget(pointLight.ShadowMap, CubeMapFace.PositiveZ);
this.GraphicsDevice.Clear(Color.Transparent);
this.DepthWriterEffect.Parameters["View"].SetValue(views[0]);
this.RenderSceneForShadows();
// Backward
this.GraphicsDevice.SetRenderTarget(pointLight.ShadowMap, CubeMapFace.NegativeZ);
this.GraphicsDevice.Clear(Color.Transparent);
this.DepthWriterEffect.Parameters["View"].SetValue(views[1]);
this.RenderSceneForShadows();
// Left
this.GraphicsDevice.SetRenderTarget(pointLight.ShadowMap, CubeMapFace.NegativeX);
this.GraphicsDevice.Clear(Color.Transparent);
this.DepthWriterEffect.Parameters["View"].SetValue(views[2]);
this.RenderSceneForShadows();
// Right
this.GraphicsDevice.SetRenderTarget(pointLight.ShadowMap, CubeMapFace.PositiveX);
this.GraphicsDevice.Clear(Color.Transparent);
this.DepthWriterEffect.Parameters["View"].SetValue(views[3]);
this.RenderSceneForShadows();
// Down
this.GraphicsDevice.SetRenderTarget(pointLight.ShadowMap, CubeMapFace.NegativeY);
this.GraphicsDevice.Clear(Color.Transparent);
this.DepthWriterEffect.Parameters["View"].SetValue(views[4]);
this.RenderSceneForShadows();
// Up
this.GraphicsDevice.SetRenderTarget(pointLight.ShadowMap, CubeMapFace.PositiveY);
this.GraphicsDevice.Clear(Color.Transparent);
this.DepthWriterEffect.Parameters["View"].SetValue(views[5]);
this.RenderSceneForShadows();
}
/// <summary>
/// Parses a <see cref="PointLight" /> from the given XML node.
/// </summary>
/// <param name="node">The XML node.</param>
/// <returns>A <see cref="SceneNode" /> instance.</returns>
public SceneNode ParsePointLight(XElement node)
{
var pointLight = new PointLight(
this.ParseVector3(node.Element("position")),
Quaternion.Identity,
Vector3.One,
float.Parse(node.Attribute("radius").Value),
this.ParseColor(node.Element("color")),
float.Parse(node.Attribute("intensity").Value),
bool.Parse(node.Attribute("cast-shadows").Value),
int.Parse(node.Attribute("resolution").Value),
float.Parse(node.Attribute("bias").Value));
var sceneNode = new SceneNode();
sceneNode.AttachEntity(pointLight);
return sceneNode;
}
