Exemple #1
0
        public override ISect intersect(Ray currentRay)
        {
            ISect record = null;
            float a = currentRay.Direction.Dot(currentRay.Direction);
            float b = (currentRay.Origin - Position).Dot(currentRay.Direction) * 2.0f;
            float c = (currentRay.Origin - Position).Dot(currentRay.Origin - Position) - (float)Math.Pow(radius,2.0);

            float det = (float)Math.Pow(b, 2) - 4 * a * c;
            if (det < 0)
                return null;

            float t1 = (-b + (float)Math.Sqrt(det)) / (2 * a);
            float t2 = (-b - (float)Math.Sqrt(det)) / (2 * a);

            if (t1 < 0 && t2 < 0)
                return record;

            record = new ISect();
            record.Thing = this;
            record.Ray = currentRay;

            if (t1 < 0)
                record.Dist = t2;
            else if (t2 < 0)
                record.Dist = t1;
            else
                record.Dist = Math.Min(t1, t2);

            return record;
        }
Exemple #2
0
 public static Vec3 GetPosition(Ray currentRay, float t)
 {
     return currentRay.Direction * t + currentRay.Origin;
 }
Exemple #3
0
        public void castRays()
        {
            /*
            Ray[] Rays = new Ray[width*height];

            for(int y = 0; y<height; y++)
                for(int x = 0; x<width; x++)
                    Rays[y*width+x] = new Ray(){
                        Origin = Camera.Origin,
                        Direction = Camera.Direction + new Vec3(x/width-.5f,y/height-.5f,0)
                    };

            foreach (Ray currentRay in Rays)
            {
                var intersections = defaultScene.things
                .Select(thing => thing.intersect(currentRay))
                .Where(t => t != null)
                .OrderBy(t=>t)
                .FirstOrDefault();
            }
             */

            Ray CurrentRay, reflectedRay;

            for (int y = 0; y < height; y++)
                for (int x = 0; x < width; x++)
                {
                    //Create Ray
                    CurrentRay = new Ray()
                    {
                        Origin = Camera.Origin,
                        Direction = (new Vec3(x / ((float)width) - .5f, y / ((float)height) - .5f, 0) - Camera.Origin).Normalize()
                    };

                    //Intersect Ray
                    var intersection = defaultScene.things
                    .Select(thing => thing.intersect(CurrentRay))
                    .Where(t => t != null)
                    .OrderBy(t => t.Dist)
                    .FirstOrDefault();

                    var pixelColor = new Color(0, 0, 0);

                    var reflection = 0.0f;

                    for (int r = 0; r <= 5; r++)
                    {
                        if (intersection == null)
                            break;

                        pixelColor = pixelColor * reflection + (Color.phong(intersection, defaultScene) * (1 - reflection));
                        reflection = intersection.Thing.reflect;

                        reflectedRay = new Ray()
                        {
                            Direction = intersection.Position() - intersection.Thing.Position,
                            Origin = intersection.Position() + ((intersection.Position() - intersection.Thing.Position) * .01f)
                        };

                        intersection = defaultScene.things
                        .Select(thing => thing.intersect(reflectedRay))
                        .Where(t => t != null)
                        .OrderBy(t => t.Dist)
                        .FirstOrDefault();
                    }

                    //Color Pixel
                    //Buffer.Add(Color.phong(intersections, defaultScene) ?? new Color());
                    setPixel(x, y, Color.swap(pixelColor ?? new Color()));
                }

            return;
        }
Exemple #4
0
 public virtual Color phong(Ray currentRay, float t)
 {
     return new Color(0,0,0);
 }
Exemple #5
0
 public virtual ISect intersect(Ray currentRay)
 {
     return null;
 }
Exemple #6
0
 public override Color phong(Ray currentRay, float t)
 {
     return base.phong(currentRay, t);
 }