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;
}
public static Vec3 GetPosition(Ray currentRay, float t)
{
return currentRay.Direction * t + currentRay.Origin;
}
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;
}
public virtual Color phong(Ray currentRay, float t)
{
return new Color(0,0,0);
}
public virtual ISect intersect(Ray currentRay)
{
return null;
}
public override Color phong(Ray currentRay, float t)
{
return base.phong(currentRay, t);
}
