public static Pixel[] start()
{
Pixel[] pixels = new Pixel[Constants.WIN_X * Constants.WIN_Y];
Point3 viewPlane = new Point3(-Constants.WIN_X / 2, -Constants.WIN_X / 2, 0);
createScene();
for (int y = 0; y < Constants.WIN_Y; y++)
{
for (int x = 0; x < Constants.WIN_X; x++)
{
Pixel p = new Pixel();
p.rect.X = x;
p.rect.Y = Constants.WIN_Y - 1 - y;
Point3 viewPixel = new Point3();
viewPixel.x = viewPlane.x + x;
viewPixel.y = viewPlane.y + y;
viewPixel.z = viewPlane.z;
Ray r = new Ray();
r.direction = Point3.vectorize(layout.Cam.Eye, viewPixel);
r.start = layout.Cam.Eye;
p.color = fireRay(r, Constants.MIN_DEPTH, null);
pixels[y * Constants.WIN_X + x] = p;
}
}
return(pixels);
}
public static Color3 diffuse(Hit h, Shape s, Light bulb)
{
Color3 diffuse = Black;
Vector3 normal = s.calcNormal(h);
Vector3 lightDir = Point3.vectorize(bulb.Location, h.intersect);
double diffuseDot = Vector3.DotProduct(lightDir, normal);
if (diffuseDot >= 0)
{
diffuse = (bulb.Color * s.Material.Diffuse) * diffuseDot;
}
return(diffuse);
}
public static Color3 specular(Ray r, Hit h, Shape s, Light bulb)
{
Color3 specular = Black;
Vector3 normal = s.calcNormal(h);
Vector3 lightDir = Point3.vectorize(bulb.Location, h.intersect);
Vector3 refDir = lightDir - (2 * (Vector3.DotProduct(lightDir, normal) / Math.Pow(normal.Abs(), 2)) * normal);
double specularDot = Vector3.DotProduct(r.direction, refDir);
if (specularDot >= 0)
{
specular = (bulb.Color * s.Material.Specular) * Math.Pow(specularDot, s.Material.Ke);
}
return(specular);
}
// spawn a shadow ray from the intersection point to the light source.
private static bool spawnShadow(Light bulb, Hit finalHit, Shape hitShape, Shape fromShape)
{
Ray shadowRay = new Ray();
shadowRay.start = finalHit.intersect;
shadowRay.direction = Point3.vectorize(shadowRay.start, bulb.Location);
double shadowDist = Point3.distance(shadowRay.start, bulb.Location);
foreach (Shape s in layout.Shapes)
{
// If this is the object we're checking from, ignore. Duh.
if (s.Equals(hitShape) || s.Equals(fromShape) || s.Material.Kt > 0)
{
continue;
}
Hit shadowHit = s.intersect(shadowRay);
if (shadowHit.intersect.z == Constants.FAR_AWAY)
{
continue;
}
// We need to check if hitShape object is in FRONT OF the current one. if it is, we need to ignore this current shape.
Vector3 frontTest = Point3.vectorize(shadowHit.intersect, finalHit.intersect);
if (frontTest.X > 0 && frontTest.Y > 0 && frontTest.Z > 0)
{
continue;
}
// something has to come between the light and the current shape.
double shapeDist = Point3.distance(shadowRay.start, shadowHit.intersect);
if (shapeDist < shadowDist)
{
return(true);
}
}
return(false);
}
public void setup()
{
_Normal = Point3.vectorize(Lookat, Eye);
_Up = Vector3.CrossProduct(Orient, Normal);
_View = Vector3.CrossProduct(Normal, Up);
}