void ortho(const typename DerivedP::Scalar left, const typename DerivedP::Scalar right, const typename DerivedP::Scalar bottom, const typename DerivedP::Scalar top, const typename DerivedP::Scalar nearVal, const typename DerivedP::Scalar farVal, Eigen::PlainObjectBase< DerivedP > &P)
Implementation of the deprecated glOrtho function.