code: public Matrix3f set(Matrix4x3fc m) {
          m00 = m.m00();
          m01 = m.m01();
          m02 = m.m02();
          m10 = m.m10();
          m11 = m.m11();
          m12 = m.m12();
          m20 = m.m20();
          m21 = m.m21();
          m22 = m.m22();
          return this;
      }
docs: Set the elements of this matrix to the left 3x3 submatrix of <code>m</code>.
  
  @param m
  the matrix to copy the elements from
  @return this