public double MaxAnglePerpendicular(ref clsPoint3d maxAV1, ref clsPoint3d maxAV2)
{
double a;
double maxA;
clsPoint3d py, pz;
clsPoint3d p1 = null, p2 = null, p3 = null, p4 = null;
if (MaxAngle(ref p3, ref p4) < myTol)
{
return(0);
}
pz = new clsPoint3d(0, 0, 1.0);
py = pz.Cross(p3);
if (IsSameDbl(py.Length, 0))
{
py = pz.Cross(p4);
}
if (IsSameDbl(py.Length, 0))
{
return(0);
}
py.Normalise();
maxA = 0;
for (int j = 0; j <= myCameraPoints.Count - 2; j++)
{
for (int k = j + 1; k <= myCameraPoints.Count - 1; k++)
{
p1 = myCameraPoints[j];
p1 = py * py.Dot(p1) + pz * pz.Dot(p1);
p1.Normalise();
p2 = myCameraPoints[k];
p2 = py * py.Dot(p2) + pz * pz.Dot(p2);
p2.Normalise();
a = Acos(p1.Dot(p2));
if (Abs(a) > maxA)
{
maxA = Abs(a);
maxAV1 = p1.Copy();
maxAV2 = p2.Copy();
}
}
}
return(maxA);
}
public double DistanceToLine(clsLine3d l2)
{
//Perpendicular distance between 3d lines. Limited to the line segments.
double myNormalDist;
clsPoint3d v1;
clsPoint3d v2;
clsPoint3d M;
double m2;
clsPoint3d R;
clsPoint3d P21;
double t1;
double t2;
clsPoint3d Q1;
clsPoint3d Q2;
//Find the actual point on this line where the perpendicular distance hits. If it is off the line, then find the minimum distance between the end points
v1 = new clsPoint3d(DX(), DY(), DZ());
v1.Normalise();
v2 = new clsPoint3d(l2.DX(), l2.DY(), l2.DZ());
v2.Normalise();
P21 = new clsPoint3d(l2.X1 - X1, l2.X1 - X1, l2.X1 - X1);
M = v2.Cross(v1);
m2 = M.Dot(M);
if (m2 < mdlGeometry.myTol)
{
return(DistanceToPoint(l2.P1));
}
//Parallel
myNormalDist = Abs(P21.Dot(M)) / Sqrt(m2);
//Perpendicular distance
R = P21.Cross(M);
R.Scale(1 / m2);
t1 = R.Dot(v2);
Q1 = P1 + t1 * v1;
if (t1 < 0)
{
Q1 = P1;
}
if (t1 > Length)
{
Q1 = P2;
}
t2 = R.Dot(v1);
Q2 = l2.P1 + t2 * v2;
if (t2 < 0)
{
Q2 = l2.P1;
}
if (t2 > l2.Length)
{
Q2 = l2.P2;
}
return(Q1.Dist(Q2));
}
public void RotateAboutLine(clsLine3d l1, double theta)
{
clsPoint3d p1 = default(clsPoint3d);
clsPoint3d p2 = default(clsPoint3d);
clsPoint3d p2a = default(clsPoint3d);
clsPoint3d p2b = default(clsPoint3d);
clsPoint3d p3 = default(clsPoint3d);
clsLine3d l2 = default(clsLine3d);
if (l1.IsOnLine(this))
{
return;
}
//Setup a coordinate system with X running along l1 and the origin at l1.p2
l2 = new clsLine3d(l1.P2.Copy(), Copy());
p1 = new clsPoint3d(l1.DX(), l1.DY(), l1.DZ());
p1.Length = 1;
p2 = new clsPoint3d(l2.DX(), l2.DY(), l2.DZ());
p2a = new clsPoint3d(l2.DX(), l2.DY(), l2.DZ());
p2.Length = 1;
p3 = p1.Cross(p2);
p3.Length = 1;
p2 = p1.Cross(p3);
p2.Length = 1;
if (p2.Dot(p2a) < 0)
{
p2.Scale(-1);
}
p2b = new clsPoint3d(p1.Dot(p2a), p2.Dot(p2a), p3.Dot(p2a));
p2b.RotateAboutX(theta);
myX = l1.X2 + p2b.x * p1.x + p2b.y * p2.x + p2b.z * p3.x;
myY = l1.Y2 + p2b.x * p1.y + p2b.y * p2.y + p2b.z * p3.y;
myZ = l1.Z2 + p2b.x * p1.z + p2b.y * p2.z + p2b.z * p3.z;
}
public static clsPoint3d ProjectPointOntoPlaneAlongZ(clsPoint p, clsLine3d l1)
{
clsLine3d v1 = new clsLine3d();
double u = 0;
double r = 0;
double z = 0;
clsPoint3d p1 = new clsPoint3d();
v1 = new clsLine3d(new clsPoint3d(0, 0, 0), new clsPoint3d(0, 0, 1));
u = v1.Dot(l1);
//This is the length of the normal vector, measured in the vertical direction
p1 = new clsPoint3d(p.X - l1.X1, p.Y - l1.Y1, 0 - l1.Z1);
r = p1.Dot(l1.DP());
//r is the distance of our point to the nearest point on the plane
//r = v1.Dot(myV)
z = r / u;
//z is the vertical distance of our point to the plane. It is sign sensitive - positive is above the plane.
return(new clsPoint3d(p.X, p.Y, -z));
}