code: protected boolean invisibleCarbon(IAtom atom, IAtomContainer atomContainer, RendererModel model) {
          return isCarbon(atom) && !showCarbon(atom, atomContainer, model);
      }
docs: Checks an atom to see if it is an 'invisible carbon' - that is, it is:
  a) a carbon atom and b) this carbon should not be shown.
  
  @param atom the atom to check
  @param atomContainer the atom container the atom is part of
  @param model the renderer model
  @return true if this atom should not be shown