private Ray GetReflectedRay(Ray r, SceneObject hitObject)
{
Vector3D n = hitObject.Geometry.GetNormalAtPoint(hitObject.Material.Hitpoint);
float k = (-1f) * r.Direction * n;
return new Ray(hitObject.Material.Hitpoint, r.Direction + (2 * k * n), hitObject);
}
public SceneObject GetIntersectedObject(Ray r)
{
var hitObjects = from so in sceneObjects
where so.Hit(r).Item1
orderby so.Hit(r).Item2
select so;
return hitObjects.FirstOrDefault();
}
public Tuple<bool, float> Hit(Ray ray)
{
var ht = geometry.Hit(ray);
if (ht.Item1)
material.Hitpoint = ray.Origin + ray.Direction * ht.Item2;
return ht;
}
public override Tuple<bool, float> Hit(Ray r)
{
Tuple<bool, float> hit = plane.Hit(r);
Vector3D hitpoint = r.Origin + hit.Item2 * r.Direction;
Vector3D v = hitpoint - A;
float dot = plane.GetNormalAtPoint(hitpoint) * v;
if (v.Length <= radius && dot < Geometry.Epsilon)
return hit;
return Geometry.NoIntersection;
}
public override Tuple<bool, float> Hit(Ray r)
{
Vector3D v = p - r.Origin;
float a = n * v;
float b = n * r.Direction;
if (b < Geometry.Epsilon) return Geometry.NoIntersection;
return new Tuple<bool, float>(true, a / b);
}
public Color Shade(Ray ray)
{
Color L = Color.Black;
Vector3D normal = parentObject.Geometry.GetNormalAtPoint(hitpoint);
foreach (var light in world.Lights)
{
Vector3D toLight = (light.Position - hitpoint).Unit;
float s = toLight * normal;
if (s < 0f) s = 0f;
L += props.Color * (props.Ambient + props.Diffuse * s);
}
return L;
}
public override Tuple<bool, float> Hit(Ray r)
{
Vector3D v = r.Origin - center;
float a = r.Direction * r.Direction;
float b = 2f * v * r.Direction;
float c = v * v - radius * radius;
float delta = b * b - 4f * a * c;
if (delta < 0f) return Geometry.NoIntersection;
if (delta > 0f)
{
float t = (-b - (float)Math.Sqrt(delta)) / (2f * a);
if (t > Geometry.Epsilon)
return new Tuple<bool, float>(true, t);
}
return Geometry.NoIntersection;
}
private Ray GetRefractedRay(Ray r, SceneObject hitObject)
{
Vector3D n = hitObject.Geometry.GetNormalAtPoint(hitObject.Material.Hitpoint);
float n1 = r.ObjectAtEmission.Material.RefractiveIndex;
float n2 = hitObject.Material.RefractiveIndex;
float ri = n1 / n2;
float c1 = -(n * r.Direction);
float c2 = (float)Math.Sqrt(1f - ri * ri * (1f - c1 * c1));
Vector3D dir = (ri * r.Direction) + (ri * c1 - c2) * n;
return new Ray(hitObject.Material.Hitpoint, dir, hitObject);
}
private Color TraceRay(Ray r, int d)
{
Color L = Color.Black;
if (d > maxDepth) return L;
var hitObject = GetIntersectedObject(r);
if (hitObject == null) return L;
L = hitObject.Material.Shade(r);
if (hitObject.Material.IsReflexive)
L += TraceRay(GetReflectedRay(r, hitObject), d + 1);
if (hitObject.Material.IsRefractive)
L += TraceRay(GetRefractedRay(r, hitObject), d + 1);
return L;
}
public virtual Tuple<bool, float> Hit(Ray r)
{
throw new NotImplementedException();
}
public override Tuple<bool, float> Hit(Ray r)
{
return bt;
}