Using ofNode to build an L-System

not sure what you are trying to do but things like:

        if (c == 'F') {
            branching = true;
        }else if (c == '+') {
            auto jointBranch = Branch();
            jointBranch.setParent(branch);
            jointBranch.roll(45);
            auto branch = Branch();
            branch.setParent(jointBranch);
        }

don't make much sense since that last auto branch is being deleted right away after that block ends