/// <summary>
/// Adds the point light.
/// </summary>
/// <param name="pointLight">The point light.</param>
public static void AddPointLight(Lights.PointLight pointLight)
{
pointLights.Add(pointLight);
}
/// <summary>
/// Draws a point light.
/// </summary>
/// <param name="device">The device.</param>
/// <param name="colorRT">The color RT.</param>
/// <param name="normalRT">The normal RT.</param>
/// <param name="depthRT">The depth RT.</param>
/// <param name="camera">The camera.</param>
/// <param name="pointLight">The point light.</param>
void DrawPointLight(GraphicsDevice device, RenderTarget2D colorRT, RenderTarget2D normalRT, RenderTarget2D depthRT, Camera camera, Lights.PointLight pointLight)
{
// Set the G-Buffer parameters
pointLightEffect.Parameters["colorMap"].SetValue(colorRT);
pointLightEffect.Parameters["normalMap"].SetValue(normalRT);
pointLightEffect.Parameters["depthMap"].SetValue(depthRT);
// Compute the light world matrix
// scale according to light radius, and translate it to light position
Matrix sphereWorldMatrix = Matrix.CreateScale(pointLight.Range) * Matrix.CreateTranslation(pointLight.Position);
pointLightEffect.Parameters["World"].SetValue(sphereWorldMatrix);
pointLightEffect.Parameters["View"].SetValue(camera.ViewMatrix);
pointLightEffect.Parameters["Projection"].SetValue(camera.ProjectionMatrix);
// Light position
pointLightEffect.Parameters["lightPosition"].SetValue(pointLight.Position);
// Set the color, radius and Intensity
pointLightEffect.Parameters["Color"].SetValue(pointLight.Color);
pointLightEffect.Parameters["lightRadius"].SetValue(pointLight.Range);
pointLightEffect.Parameters["lightIntensity"].SetValue(pointLight.Intensity);
// Parameters for specular computations
pointLightEffect.Parameters["cameraPosition"].SetValue(camera.Position);
pointLightEffect.Parameters["InvertViewProjection"].SetValue(Matrix.Invert(camera.ViewMatrix * camera.ProjectionMatrix));
// Size of a halfpixel, for texture coordinates alignment
pointLightEffect.Parameters["halfPixel"].SetValue(halfPixel);
// Calculate the distance between the camera and light center
float cameraToCenter = Vector3.Distance(camera.Position, pointLight.Position);
// If we are inside the light volume, draw the sphere's inside face
if (cameraToCenter < pointLight.Range)
{
device.RasterizerState = RasterizerState.CullClockwise;
}
else
{
device.RasterizerState = RasterizerState.CullCounterClockwise;
}
device.DepthStencilState = DepthStencilState.None;
// Apply the Effect
pointLightEffect.Techniques[0].Passes[0].Apply();
// Draw the Sphere mesh
foreach (ModelMesh mesh in sphereModel.Meshes)
{
foreach (ModelMeshPart meshPart in mesh.MeshParts)
{
device.SetVertexBuffer(meshPart.VertexBuffer, meshPart.VertexOffset);
device.Indices = meshPart.IndexBuffer;
device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, meshPart.NumVertices, meshPart.StartIndex, meshPart.PrimitiveCount);
}
}
}
