code: public Matrix4d setTranslation(double x, double y, double z) {
          m30 = x;
          m31 = y;
          m32 = z;
          properties &= ~(PROPERTY_PERSPECTIVE | PROPERTY_IDENTITY);
          return this;
      }
docs: Set only the translation components <code>(m30, m31, m32)</code> of this matrix to the given values <code>(x, y, z)</code>.
  <p>
  To build a translation matrix instead, use {@link #translation(double, double, double)}.
  To apply a translation, use {@link #translate(double, double, double)}.
  
  @see #translation(double, double, double)
  @see #translate(double, double, double)
  
  @param x
  the units to translate in x
  @param y
  the units to translate in y
  @param z
  the units to translate in z
  @return this