public static void Main(string[] args)
{
// Create shaders:
Shader solidRed = new UnlitColorShader("red");
Shader solidBlue = new UnlitColorShader("blue");
Shader glass = new GlassShader();
// Create the models:
Model cube = new CubeModel(solidRed);
Model monkey = new Suzanne(glass);
// Draw the two models:
cube.Draw(); // "Rendering Cube with a red color."
monkey.Draw(); // "Rendering Suzanne to look like glass."
// Switch out the shader on suzanne:
monkey.SetShader(solidBlue);
monkey.Draw(); // "Rendering Suzanne with a blue color."
}