public override Intersection Intersects(Ray ray)
{
double denom = Vector3.DotProduct(normal, ray.Direction);
if (Math.Abs(denom) > 0.0001)
{
double t = Vector3.DotProduct(position - ray.Start, normal) / denom;
if (t > 0.0005)
return new Intersection(t, ray.PointAt(t), this, normal, null);
}
return Intersection.False;
}
public override Intersection Intersects(Ray ray)
{
Vector3 T = ray.Start - Vertex0.Position;
Vector3 P = Vector3.CrossProduct(ray.Direction, E2);
Vector3 Q = Vector3.CrossProduct(T, E1);
double denom = Vector3.DotProduct(P, E1);
if (Math.Abs(denom) > 0.0001)
{
double u = Vector3.DotProduct(P, T) / denom;
double v = Vector3.DotProduct(Q, ray.Direction) / denom;
double t = Vector3.DotProduct(Q, E2) / denom;
bool kl = denom < 0.0;
if ((u >= 0.0 && u <= 1.0) && (v >= 0.0 && u + v <= 1.0))
return new Intersection(t, ray.PointAt(t), this, kl ? Normal : Normal.Negated, new Vector2(u, kl ? v : 1 - v)); // (kl ? v : 1-v) automatic texture flipping
}
return Intersection.False;
}
public override Intersection Intersects(Ray ray)
{
double a = Vector3.DotProduct(ray.Direction, ray.Direction);
double b = 2 * Vector3.DotProduct(ray.Direction, ray.Start - Position);
Vector3 rayToCenter = ray.Start - Position;
double c = Vector3.DotProduct(rayToCenter, rayToCenter) - radius2;
double dis = b * b - 4 * a * c;
if (dis >= 0.0)
{
double t = (-Math.Sqrt(dis) - b) / (2.0 * a);
Vector3 point = ray.PointAt(t);
return new Intersection(t, point, this, (point - Position).Normalized, null);
}
return Intersection.False;
}
