public override bool intersect(Ray ray, Intersection intersection)
{
double vd;
double vx;
double vy;
Vector3D orig = ray.Location.subNew(position());;
Vector3D dir = ray.direction();
/* Check if the ray lies parallel to the plane */
vd = ng.dot(dir);
if ((vd > -photontracer.SceneConstants.EPSILON) && (vd < photontracer.SceneConstants.EPSILON))
{
return(false);
}
/* Check if ray intersects plane */
double t = -((ng.x() * orig.x()) + (ng.y() * orig.y()) + (ng.z() * orig.z()) + d) / vd;
if (t < photontracer.SceneConstants.EPSILON)
{
return(false);
}
/* Check if intersection is inside the triangle */
switch (dropAxis)
{
case 0:
vx = (orig.y() + (dir.y() * t)) - v0.p.y();
vy = (orig.z() + (dir.z() * t)) - v0.p.z();
break;
case 1:
vx = (orig.x() + (dir.x() * t)) - v0.p.x();
vy = (orig.z() + (dir.z() * t)) - v0.p.z();
break;
default:
vx = (orig.x() + (dir.x() * t)) - v0.p.x();
vy = (orig.y() + (dir.y() * t)) - v0.p.y();
break;
}
double u = (edge2x * vy) - (edge2y * vx);
if ((u < 0.0) || (u > 1.0))
{
return(false);
}
double v = (edge1y * vx) - (edge1x * vy);
if ((v < 0.0) || ((u + v) > 1.0))
{
return(false);
}
Vector3D intersectionPoint;
intersectionPoint = ray.direction().scaleNew(t);
intersectionPoint.add(ray.Location);
intersection.IntersectionPoint = intersectionPoint;
intersection.IntersectedObject = this;
intersection.Lambda = t;
return(true);
}
public override bool intersect(Ray ray, Intersection intersection)
{
Vector3D location, direction;
double a, b, c, d;
location = ray.Location.subNew(position());
direction = ray.direction().scaleNew(invRadius());
location.scale(invRadius());
a = direction.sqrNorm();
b = direction.dot(location);
c = location.sqrNorm() - 1;
d = (b * b) - a * c;
if (d < 0)
{
return(false);
}
try
{
Vector3D intersectionPoint;
double invA, l1, l2, lambda;
invA = 1.0 / a;
l1 = (-b + System.Math.Sqrt(d)) * invA;
l2 = (-b - System.Math.Sqrt(d)) * invA;
if (l1 >= photontracer.SceneConstants.EPSILON && l2 >= photontracer.SceneConstants.EPSILON)
{
lambda = (l1 < l2)?l1:l2;
}
else if (l1 >= photontracer.SceneConstants.EPSILON)
{
lambda = l1;
}
else if (l2 >= photontracer.SceneConstants.EPSILON)
{
lambda = l2;
}
else
{
return(false);
}
intersectionPoint = ray.direction().scaleNew(lambda);
intersectionPoint.add(ray.Location);
intersection.IntersectionPoint = intersectionPoint;
intersection.IntersectedObject = this;
intersection.Lambda = lambda;
return(true);
}
catch (System.ArithmeticException e)
{
System.Console.Out.WriteLine(e);
return(false);
}
}
public override bool intersect(Ray ray, Intersection intersection)
{
Vector3D location, direction;
double a, b, c, d, dx, dz, lx, lz;
location = ray.Location.subNew(position());
direction = ray.direction().scaleNew(invRadius());
location.scale(invRadius());
dx = direction.x();
dz = direction.z();
lx = location.x();
lz = location.z();
a = dx * dx + dz * dz;
b = dx * lx + dz * lz;
c = lx * lx + lz * lz - 1;
d = (b * b) - a * c;
if (d < 0)
{
return(false);
}
try
{
Vector3D intersectionPoint;
double invA, l1, l2, lambda1, lambda2, f_lambda, no_lambdas;
invA = 1.0 / a;
l1 = (-b + System.Math.Sqrt(d)) * invA;
l2 = (-b - System.Math.Sqrt(d)) * invA;
lambda1 = -1;
lambda2 = -1;
if (l1 >= photontracer.SceneConstants.EPSILON && l2 >= photontracer.SceneConstants.EPSILON)
{
no_lambdas = 2;
lambda1 = (l1 < l2)?l1:l2;
lambda2 = (l1 < l2)?l2:l1;
}
else if (l1 >= photontracer.SceneConstants.EPSILON)
{
no_lambdas = 1;
lambda1 = l1;
}
else if (l2 >= photontracer.SceneConstants.EPSILON)
{
no_lambdas = 1;
lambda1 = l2;
}
else
{
return(false);
}
intersectionPoint = ray.direction().scaleNew(lambda1);
intersectionPoint.add(ray.Location);
double py = intersectionPoint.y() - position().y();
if ((py < 0.0) || (py > height()))
{
if (no_lambdas == 2)
{
intersectionPoint = ray.direction().scaleNew(lambda2);
intersectionPoint.add(ray.Location);
py = intersectionPoint.y() - position().y();
if ((py < 0.0) || (py > height()))
{
return(false);
}
else
{
f_lambda = lambda2;
}
}
else
{
return(false);
}
}
else
{
f_lambda = lambda1;
}
intersection.IntersectionPoint = intersectionPoint;
intersection.IntersectedObject = this;
intersection.Lambda = f_lambda;
return(true);
}
catch (System.ArithmeticException e)
{
System.Console.Out.WriteLine(e);
return(false);
}
}