message: Add a comment on the non genericity of the algorithm
diff: @@ -435,6 +435,11 @@ namespace RINGMesh
  origin = plane.origin;
  w = plane.normal;
  + // @todo A generic algorithm to find the first vector belonging to the plane
  + // can be found using principal component of the plane normal.
  + // However it is not a simple problem. The current version is
  + // not generic and is based on the idea that the plane is either a map section
  + // or a cross-section. [PA]
  vec3 another_point_for_v_axis{ origin };
  if( w.z > 10 * ( w.x + w.y ) )
  {
  