Method signedDistTo

code/geometry/primitives3d.cpp:31–34

    // A and B must be two different points
    return ((*this - A) * (*this - B)).length() / A.distTo(B);}
  double signedDistTo(PL(A,B,C)) const {
    // A, B and C must not be collinear
    point3d N = (B-A)*(C-A); double D = A%N;
    return ((*this)%N - D)/N.length(); }
  point3d normalize(double k = 1) const {
    // length() must not return 0
    return (*this) * (k / length()); }