code: public Matrix3f scaling(float x, float y, float z) {
          MemUtil.INSTANCE.zero(this);
          m00 = x;
          m11 = y;
          m22 = z;
          return this;
      }
docs: Set this matrix to be a simple scale matrix.
  
  @param x
  the scale in x
  @param y
  the scale in y
  @param z
  the scale in z
  @return this