scaleEqual method
Scale this matrix by s
Implementation
Mat33 scaleEqual(double s ){// multiplyScalar
List<double> te = elements;
te[0] *= s; te[1] *= s; te[2] *= s;
te[3] *= s; te[4] *= s; te[5] *= s;
te[6] *= s; te[7] *= s; te[8] *= s;
return this;
}