Point3d Point3d::operator+(const Vector3d &v)const{
return Point3d(x + v.getx(), y + v.gety(), z + v.getz());
}
// vector
Vector2d::Vector2d(const Vector3d &v){
if(FEQZ(v.getz())) FAILURE(L"Converting Vector3d to Vector2d illegal");
dx = v.getx();
dy = v.gety();
}
Point3d::Point3d(const Vector3d& v) {
x = v.getx(); y = v.gety(); z = v.getz();// ok = true;
}
int Intof(const Line& l0, const Line& l1, Point3d& intof)
{
/* intersection of 2 vectors
returns 0 for intercept but not within either vector
returns 1 for intercept on both vectors
note that this routine always returns 0 for parallel vectors
method:
x = x0 + dx0 * t0 for l0
...
...
x = x1 + dx1 * t1 for l1
...
...
x0 + dx0 * t0 = x1 + dx1 * t1
dx0 * t0 - dx1 * t1 + x0 - x1 = 0
setup 3 x 3 determinent for
a0 t0 + b0 t1 + c0 = 0
a1 t0 + b1 t1 + c1 = 0
a2 t0 + b2 t1 + c2 = 0
from above a = l0.v
b = -l1.v
c = Vector3d(l1, l0)
*/
// Vector3d a = l0.v;
if(l0.box.outside(l1.box) == true) return 0;
Vector3d b = -l1.v;
Vector3d c = Vector3d(l1.p0, l0.p0);
Vector3d det = l0.v ^ b;
Vector3d t = b ^ c;
// choose largest determinant & corresponding parameter for accuracy
double t0 = t.getx();
double d = det.getx();
if(fabs(det.getz()) > fabs(det.gety())) {
if(fabs(det.getz()) > fabs(det.getx())) {
t0 = t.getz();
d = det.getz();
}
}
else {
if(fabs(det.gety()) > fabs(det.getx())) {
t0 = t.gety();
d = det.gety();
}
}
if(fabs(d) < 1.0e-06) return 0;
t0 /= d;
intof = l0.v * t0 + l0.p0;
Point3d other;
double t1;
if(Dist(l1, intof, other, t1) > geoff_geometry::TOLERANCE) return 0;
t0 *= l0.length;
if( t0 < -geoff_geometry::TOLERANCE || t0 > l0.length + geoff_geometry::TOLERANCE || t1 < -geoff_geometry::TOLERANCE || t1 > l1.length + geoff_geometry::TOLERANCE ) return 0;
return 1;
}
