Exemplo n.º 1
0
        // Create a version of the scene from the end of the first book in the 'Ray Tracing in One Weekend' series.
        public static Scene RandomSpheres(Config config)
        {
            var camera = new Camera(
                new Vector3(13.0f, 2.0f, 3.0f),
                new Vector3(0.0f, 0.0f, 0.0f),
                Vector3.UnitY,
                20.0f,
                config.ImageAspectRatio,
                0.1f,
                10.0f,
                0.0f,
                1.0f
                );
            var scene   = new Scene("random_spheres", camera);
            var objects = scene.HitableList;

            var groundMaterial = new Lambertian(new Vector3(0.5f, 0.5f, 0.5f));

            objects.Add(new Sphere(new Vector3(0.0f, -1000.0f, 0.0f), 1000.0f, groundMaterial));

            for (int a = -11; a < 11; a++)
            {
                for (int b = -11; b < 11; b++)
                {
                    var chooseMat = MathExt.RandomFloat();
                    var center    = new Vector3(a + 0.9f * MathExt.RandomFloat(), 0.2f,
                                                b + 0.9f * MathExt.RandomFloat());

                    IMaterial material;

                    if ((center - new Vector3(4.0f, 0.2f, 0.0f)).Length() > 0.9f)
                    {
                        if (chooseMat < 0.8f)
                        {
                            // Diffuse
                            var albedo = MathExt.RandomVector3() * MathExt.RandomVector3();
                            material = new Lambertian(albedo);
                            var center2 = center + new Vector3(0, MathExt.RandomFloat(0.0f, 0.5f), 0.0f);
                            objects.Add(new MovingSphere(center, center2, 0.0f, 1.0f, 0.2f, material));
                        }
                        else if (chooseMat < 0.95f)
                        {
                            // Metal
                            var   albedo = MathExt.RandomVector3(0.5f, 1.0f);
                            float fuzz   = MathExt.RandomFloat(0.0f, 0.5f);
                            material = new Metal(albedo, fuzz);
                            objects.Add(new Sphere(center, 0.2f, material));
                        }
                        else
                        {
                            // Glass
                            material = new Dielectric(1.5f);
                            objects.Add(new Sphere(center, 0.2f, material));
                        }
                    }
                }
            }

            var material1 = new Dielectric(1.5f);

            objects.Add(new Sphere(new Vector3(0.0f, 1.0f, 0.0f), 1.0f, material1));

            var material2 = new Lambertian(new Vector3(0.4f, 0.2f, 0.1f));

            objects.Add(new Sphere(new Vector3(-4.0f, 1.0f, 0.0f), 1.0f, material2));

            var material3 = new Metal(new Vector3(0.4f, 0.2f, 0.1f), 0.0f);

            objects.Add(new Sphere(new Vector3(4.0f, 1.0f, 0.0f), 1.0f, material3));

            return(scene);
        }
Exemplo n.º 2
0
        public static void Main(string[] args)
        {
            // Image
            const double aspectRatio     = 16.0 / 9.0;
            const int    imageWidth      = 400;
            const int    imageHeight     = (int)(imageWidth / aspectRatio);
            const int    samplesPerPixel = 100;
            const int    maxDepth        = 50;

            // World
            double       R     = Math.Cos(Math.PI / 4);
            HittableList world = new HittableList();

            Lambertian materialGround = new Lambertian(new Vector3(0.8, 0.8, 0.0));
            Lambertian materialCenter = new Lambertian(new Vector3(0.1, 0.2, 0.5));
            Dielectric materialLeft   = new Dielectric(1.5);
            Metal      materialRight  = new Metal(new Vector3(0.8, 0.6, 0.2), 0.0);

            world.Add(new Sphere(new Vector3(0.0, -100.5, -1.0), 100.0, materialGround));
            world.Add(new Sphere(new Vector3(0.0, 0.0, -1.0), 0.5, materialCenter));
            world.Add(new Sphere(new Vector3(-1.0, 0.0, -1.0), 0.5, materialLeft));
            world.Add(new Sphere(new Vector3(-1.0, 0.0, -1.0), -0.4, materialLeft));
            world.Add(new Sphere(new Vector3(1.0, 0.0, -1.0), 0.5, materialRight));

            // Camera
            Vector3 lookFrom    = new Vector3(3, 3, 2);
            Vector3 lookAt      = new Vector3(0, 0, -1);
            Vector3 vUp         = new Vector3(0, 1, 0);
            double  distToFocus = (lookFrom - lookAt).Length();
            double  aperture    = 2.0;

            Camera cam = new Camera(lookFrom, lookAt, vUp, 20, aspectRatio, aperture, distToFocus);

            // Output .ppm header
            StreamWriter writer = new StreamWriter(Filename, false, System.Text.Encoding.ASCII);

            writer.WriteLine("P3");                               // ASCII encoding
            writer.WriteLine("{0} {1}", imageWidth, imageHeight); // Image resolution
            writer.WriteLine("255");                              // Max value of color components

            for (int j = imageHeight - 1; j >= 0; --j)
            {
                // Progress indicator
                Console.Write("\rScanlines remaining: {0}  ", j); // Extra spaces at end help clear console line
                for (int i = 0; i < imageWidth; ++i)
                {
                    Vector3 pixelColor = new Vector3(0, 0, 0);
                    for (int s = 0; s < samplesPerPixel; ++s)
                    {
                        // Generate randomized rays from camera viewport
                        double u = (i + rand.NextDouble()) / (imageWidth - 1);
                        double v = (j + rand.NextDouble()) / (imageHeight - 1);
                        Ray    r = cam.GetRay(u, v, rand);
                        pixelColor = pixelColor + rayColor(r, world, maxDepth);
                    }
                    if (pixelColor.X == 0 && pixelColor.Y == 0 && pixelColor.Z == 0)
                    {
                        ;
                    }
                    writer.WriteLine(pixelColor.WriteColor(pixelColor, samplesPerPixel));
                }
            }

            Console.WriteLine("\nDone.");
            writer.Close();
        }
Exemplo n.º 3
0
        public static Scene MovingSphereRing(Config config)
        {
            var center = new Vector3(0.0f, 2.0f, 0.0f);
            var camera = new Camera(
                new Vector3(-12.0f, 2.0f, 8.0f),
                center,
                Vector3.UnitY,
                30.0f,
                config.ImageAspectRatio,
                0.0f,
                10.0f,
                0.0f,
                1.0f
                );
            var scene   = new Scene("moving_sphere_ring", camera);
            var objects = scene.HitableList;

            var groundMaterial = new Lambertian(new Vector3(0.4f, 0.4f, 0.4f));

            objects.Add(new Sphere(new Vector3(0.0f, -1000.0f, 0.0f), 1000.0f, groundMaterial));

            // Center metal sphere.
            var   centerSphereMat = new Metal(new Vector3(0.5f, 0.4f, 0.4f), 0.1f);
            float centerSphereRad = 2.0f;

            objects.Add(new Sphere(center, centerSphereRad, centerSphereMat));

            // Ring of spheres.
            int   numRingSpheres = 10;
            float ringSphereRad  = 0.5f;
            float endPosOffset   = 0.3f;
            float yPos           = centerSphereRad * 0.5f;
            float theta          = (MathF.PI * 2.0f) / numRingSpheres;

            for (int i = 0; i < numRingSpheres; i++)
            {
                float angle  = (theta * i);
                float cos    = MathF.Cos(angle);
                float sin    = MathF.Sin(angle);
                float radius = centerSphereRad + 0.1f;

                float xPrime = radius * cos - radius * sin;
                float zPrime = radius * sin + radius * cos;

                IMaterial mat;
                if (i % 3 == 0)
                {
                    var   albedo = MathExt.RandomVector3(0.5f, 1.0f);
                    float fuzz   = MathExt.RandomFloat(0.0f, 0.5f);
                    mat = new Metal(albedo, fuzz);
                }
                else if (i % 4 == 0)
                {
                    mat = new Dielectric(1.5f);
                }
                else
                {
                    var albedo = MathExt.RandomVector3() * MathExt.RandomVector3();
                    mat = new Lambertian(albedo);
                }

                var startPos = new Vector3(xPrime, yPos + 1.0f, zPrime);
                var endPos   = new Vector3(xPrime + endPosOffset, yPos + 1.0f,
                                           zPrime + endPosOffset);
                objects.Add(new MovingSphere(startPos, endPos, 0.0f, 1.0f, ringSphereRad, mat));
            }

            // Background spheres.
            float bgSphereRad = 0.5f;

            objects.Add(
                new Sphere(new Vector3(center.X + 1.0f, bgSphereRad, center.Z - 8.5f), bgSphereRad,
                           new Lambertian(MathExt.RandomVector3() * MathExt.RandomVector3())),
                new Sphere(new Vector3(center.X - 3.0f, bgSphereRad, center.Z - 6.0f), bgSphereRad,
                           new Lambertian(MathExt.RandomVector3() * MathExt.RandomVector3()))
                );

            return(scene);
        }