public MainWindow()
{
InitializeComponent();
const int image_width = 400;
const int image_height = 236;
double aspect_ratio = (double)image_width / (double)image_height;
const int samples_per_pixel = 10;
const int max_depth = 50;
//World
var world = new hittable_list();
var material = new Metal(new Vektor(.7, .7, .7), 0.7);
var material1 = new Metal(new Vektor(1, 0.32, 0.36), 0);
var material2 = new Metal(new Vektor(0.90, 0.76, 0.46), 0);
var material3 = new Metal(new Vektor(0.65, 0.77, 0.97), 0);
var material4 = new Metal(new Vektor(0.90, 0.90, 0.90), 0);
world.Add(new sphere(new Vektor(0.0, -10004, -20), 10000, material));
world.Add(new sphere(new Vektor(0, 0, -20), 4, material1));
world.Add(new sphere(new Vektor(5, -1, -15), 2, material2));
world.Add(new sphere(new Vektor(5, 0, -25), 3, material3));
world.Add(new sphere(new Vektor(-5.5, 0, -15), 3, material4));
//Camera
Vektor lookfrom = new Vektor(0, 0, 0);
Vektor lookat = new Vektor(0, 0, -1);
Vektor vup = new Vektor(0, 1, 0);
var dist_to_focus = 10;
var aperture = 0.1;
Camera cam = new Camera(lookfrom, lookat, vup, 50, aspect_ratio, aperture, dist_to_focus);
Vektor[,] vArr = new Vektor[image_height, image_width];
Bitmap bmp = new Bitmap(image_width, image_height);
Parallel.For(0, image_height, j =>
{
for (int i = 0; i < image_width; i++)
{
Vektor pixel_color = new Vektor(0, 0, 0);
for (int s = 0; s < samples_per_pixel; s++)
{
var u = ((double)i + Mathe.random_double()) / (image_width - 1);
var v = ((double)j + Mathe.random_double()) / (image_height - 1);
ray r = cam.get_ray(u, v);
pixel_color += ray.ray_color(r, world, max_depth);
}
vArr[j, i] = pixel_color;
}
});
for (int j = 0; j < image_height; j++)
{
for (int i = 0; i < image_width; i++)
{
bmp.SetPixel(i, (j - (image_height - 1)) * -1, Vektor.toColor(vArr[j, i], samples_per_pixel));
}
}
image.Source = BitmapToImageSource(bmp);
}
public static Model FromObjFile(string path, IMaterial defaultMaterial)
{
var root = Path.GetDirectoryName(path);
var model = new Model();
var lastMaterial = defaultMaterial;
using (var file = new FileStream(path, FileMode.Open))
using (var reader = new StreamReader(file))
{
while (!reader.EndOfStream)
{
var line = reader.ReadLine();
// dismiss blank space
if (string.IsNullOrWhiteSpace(line))
{
continue;
}
// use comment to inform texture
if (line.StartsWith("#m"))
{
var words = line.Split(' ');
var materialStr = words[1];
switch (materialStr)
{
case "metal":
{
var arg1 = float.Parse(words[2]);
var arg2 = words[3];
Debug.Assert(root != null, nameof(root) + " != null");
var imagePath = Path.Combine(root, arg2);
if (!Directory.Exists(imagePath))
{
throw new FileNotFoundException(imagePath);
}
lastMaterial = new Metal(new BitmapTexture(imagePath), arg1);
break;
}
}
}
// dismiss comment
if (line.StartsWith("#"))
{
continue;
}
var seps = line.Split(' ');
var pattern = seps[0];
if (pattern == "f")
{
// define face
// only get index of vertex
seps = seps.Select(it =>
{
var p = it.IndexOf("/", StringComparison.Ordinal);
return(p == -1 ? it : it.Substring(0, p));
}).ToArray();
switch (seps.Length)
{
case 4:
{
var arg1 = int.Parse(seps[1]) - 1;
var arg2 = int.Parse(seps[2]) - 1;
var arg3 = int.Parse(seps[3]) - 1;
model.AddFace(arg1, arg2, arg3, lastMaterial);
break;
}
case 5:
{
var arg1 = int.Parse(seps[1]) - 1;
var arg2 = int.Parse(seps[2]) - 1;
var arg3 = int.Parse(seps[3]) - 1;
var arg4 = int.Parse(seps[4]) - 1;
model.AddFace(arg1, arg2, arg3, lastMaterial);
model.AddFace(arg1, arg2, arg4, lastMaterial);
break;
}
default:
throw new InvalidDataException(path);
}
}
else if (pattern == "v")
{
// is vertex
var arg1 = float.Parse(seps[1]);
var arg2 = float.Parse(seps[2]);
var arg3 = float.Parse(seps[3]);
model.AddVertex(arg1, arg2, arg3);
}
}
}
return(model);
}
