//Add a Point Light
public void AddLight(PointLight Light)
{
pointLights.Add(Light);
}
//Remove a Point Light
public void RemoveLight(PointLight Light)
{
pointLights.Remove(Light);
}
//Draw a Shadow Map for a Point Light
void DrawShadowMap(GraphicsDevice GraphicsDevice, PointLight Light, List <Model>
Models)
{
//Initialize View Matrices Array
Matrix[] views = new Matrix[6];
//Create View Matrices
views[0] = Matrix.CreateLookAt(Light.getPosition(), Light.getPosition() +
Vector3.Forward, Vector3.Up);
views[1] = Matrix.CreateLookAt(Light.getPosition(), Light.getPosition() +
Vector3.Backward, Vector3.Up);
views[2] = Matrix.CreateLookAt(Light.getPosition(), Light.getPosition() +
Vector3.Left, Vector3.Up);
views[3] = Matrix.CreateLookAt(Light.getPosition(), Light.getPosition() +
Vector3.Right, Vector3.Up);
views[4] = Matrix.CreateLookAt(Light.getPosition(), Light.getPosition() +
Vector3.Down, Vector3.Forward);
views[5] = Matrix.CreateLookAt(Light.getPosition(), Light.getPosition() +
Vector3.Up, Vector3.Backward);
//Create Projection Matrix
Matrix projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(90.0f),
1.0f, 1.0f, Light.getRadius());
//Set Global Effect Values
depthWriter.Parameters["Projection"].SetValue(projection);
depthWriter.Parameters["LightPosition"].SetValue(Light.getPosition());
depthWriter.Parameters["DepthPrecision"].SetValue(Light.getRadius());
#region Forward
GraphicsDevice.SetRenderTarget(Light.getShadowMap(), CubeMapFace.PositiveZ);
//Clear Target
GraphicsDevice.Clear(Color.Transparent);
//Set global Effect parameters
depthWriter.Parameters["View"].SetValue(views[0]);
//Draw Models
DrawModels(GraphicsDevice, Models);
#endregion
#region Backward
GraphicsDevice.SetRenderTarget(Light.getShadowMap(), CubeMapFace.NegativeZ);
//Clear Target
GraphicsDevice.Clear(Color.Transparent);
//Set global Effect parameters
depthWriter.Parameters["View"].SetValue(views[1]);
//Draw Models
DrawModels(GraphicsDevice, Models);
#endregion
#region Left
GraphicsDevice.SetRenderTarget(Light.getShadowMap(), CubeMapFace.NegativeX);
//Clear Target
GraphicsDevice.Clear(Color.Transparent);
//Set global Effect parameters
depthWriter.Parameters["View"].SetValue(views[2]);
//Draw Models
DrawModels(GraphicsDevice, Models);
#endregion
#region Right
GraphicsDevice.SetRenderTarget(Light.getShadowMap(), CubeMapFace.PositiveX);
//Clear Target
GraphicsDevice.Clear(Color.Transparent);
//Set global Effect parameters
depthWriter.Parameters["View"].SetValue(views[3]);
//Draw Models
DrawModels(GraphicsDevice, Models);
#endregion
#region Down
GraphicsDevice.SetRenderTarget(Light.getShadowMap(), CubeMapFace.NegativeY);
//Clear Target
GraphicsDevice.Clear(Color.Transparent);
//Set global Effect parameters
depthWriter.Parameters["View"].SetValue(views[4]);
//Draw Models
DrawModels(GraphicsDevice, Models);
#endregion
#region Up
GraphicsDevice.SetRenderTarget(Light.getShadowMap(), CubeMapFace.PositiveY);
//Clear Target
GraphicsDevice.Clear(Color.Transparent);
//Set global Effect parameters
depthWriter.Parameters["View"].SetValue(views[5]);
//Draw Models
DrawModels(GraphicsDevice, Models);
#endregion
}
