Method GeneralizedProjectPoint

Common/DataModel/vtkPlane.cxx:211–235

------------------------------------------------------------------------------ Project a point x onto plane defined by origin and normal. The projected point is returned in xproj. NOTE : normal NOT required to have magnitude 1.

// projected point is returned in xproj. NOTE : normal NOT required to
// have magnitude 1.
void vtkPlane::GeneralizedProjectPoint(
  const double x[3], const double origin[3], const double normal[3], double xproj[3])
{
  double t, xo[3], n2;

  xo[0] = x[0] - origin[0];
  xo[1] = x[1] - origin[1];
  xo[2] = x[2] - origin[2];

  t = vtkMath::Dot(normal, xo);
  n2 = vtkMath::SquaredNorm(normal);

  if (n2 != 0)
  {
    xproj[0] = x[0] - t * normal[0] / n2;
    xproj[1] = x[1] - t * normal[1] / n2;
    xproj[2] = x[2] - t * normal[2] / n2;
  }
  else
  {
    xproj[0] = x[0];
    xproj[1] = x[1];
    xproj[2] = x[2];
  }
}

//------------------------------------------------------------------------------
void vtkPlane::GeneralizedProjectPoint(const double x[3], double xproj[3])