public static Vector norm(Vector v)
{
var mag = Vector.mag(v);
var div = (mag == 0) ? double.PositiveInfinity : 1.0 / mag;
return(Vector.times(div, v));
}
public Camera(Vector pos, Vector lookAt)
{
this.pos = pos;
var down = new Vector(0.0, -1.0, 0.0);
this.forward = Vector.norm(Vector.minus(lookAt, pos));
this.right = Vector.times(1.5, Vector.norm(Vector.cross(this.forward, down)));
this.up = Vector.times(1.5, Vector.norm(Vector.cross(this.forward, this.right)));
}
private Color shade(Intersection isect, Scene scene, double depth)
{
var d = isect.ray.dir;
var pos = Vector.plus(Vector.times(isect.dist, d), isect.ray.start);
var normal = isect.thing.normal(pos);
var reflectDir = Vector.minus(d, Vector.times(2, Vector.times(Vector.dot(normal, d), normal)));
var naturalColor = Color.plus(Color.background, this.getNaturalColor(isect.thing, pos, normal, reflectDir, scene));
var reflectedColor = (depth >= this.maxDepth) ? Color.grey : this.getReflectionColor(isect.thing, pos, normal, reflectDir, scene, depth);
return(Color.plus(naturalColor, reflectedColor));
}
Vector getPoint(double x, double y, Camera camera)
{
return(Vector.norm(Vector.plus(camera.forward, Vector.plus(Vector.times(recenterX(x), camera.right), Vector.times(recenterY(y), camera.up)))));
}