public static void RenderTo(this PpmImage image, IViewportToWindowTransform v2w, float viewDistance,
Matrix4x4 viewing, Vector3 eye,
IEnumerable <Traceable> objects, IEnumerable <Light> lights, Color ambientLight)
{
var sw = new System.Diagnostics.Stopwatch();
sw.Start();
Parallel.For(0, image.Height, (y, state) =>
{
Ray ray;
Vector3 viewingPoint;
Vector3 worldPoint;
Color color;
PointF viewportPoint;
PointF windowPoint = new PointF(0, 0);
for (var x = 0; x < image.Width; x++)
{
viewportPoint = new PointF(x, y);
windowPoint = v2w.Transform(viewportPoint);
viewingPoint = new Vector3(windowPoint.X, windowPoint.Y, viewDistance);
worldPoint = viewing.Image(viewingPoint);
ray = Ray.CreateFromPoints(eye, worldPoint);
color = ray.Trace(objects, lights, eye, ambientLight);
image.Set(y, x, color);
}
});
Console.WriteLine("Elapsed: " + sw.Elapsed);
}
public static void RenderTo(this Scene scene, PpmImage image)
{
var v = new RectangleF(0, 0, image.Width, image.Height);
var w = new RectangleF(-2.0f, 2.0f, 4.0f, 4.0f);
//var w = new RectangleF(-4.0f, 4.0f, 8.0f, 8.0f);
var v2w = new ViewportToWindowTransform(w, v);
var viewing = Viewing.ViewingTransform(
scene.Eye,
scene.Center,
scene.Up
);
image.RenderTo(v2w, (float)scene.ViewingDistance, viewing, scene.Eye,
scene.Objects, scene.Lights, scene.AmbientLight);
}
static void Main(string[] args)
{
var sphere1 = new Sphere(
Color.Green,
Color.White, 150)
{
Name = "Green Sphere",
};
sphere1.Model.Translate(-0.75f, 0, 0.0f);
//sphere1.Model.Translate(0, 1.0f, 0);
var sphere2 = new Sphere(
Color.Red,
Color.White, 150)
{
Name = "Red Sphere",
};
sphere2.Model.Translate(0.75f, 0, 0);
var plane = new Objects.Plane(Color.Orange);
plane.Model.Translate(0, -0.5f, 0);
var scene = new Scene
{
Center = new Vector3(0, 0, 0),
Eye = new Vector3(0, 0, 5),
Up = new Vector3(0, 1, 0),
ViewingDistance = 5,
AmbientLight = new Vector3(0.2f, 0.2f, 0.2f).ToColor(),
Lights = new List <Light>
{
new PointLight {
Location = new Vector3(5, 3, 5)
},
},
Objects = new List <Traceable>
{
sphere1,
sphere2,
// plane
},
};
// using (var outStream = File.OpenWrite("rendered.png"))
// using (var image = new Image<Rgba32>(1000, 1000))
// {
// scene.RenderTo(image);
// image.SaveAsPng(outStream);
// }
using (var outStream = File.OpenWrite("rendered.ppm"))
{
var image = new PpmImage(1000, 1000);
scene.RenderTo(image);
image.GammaCorrect(1.8f);
image.Save(outStream).Wait();
}
}
