Returns the max scale value of the 3 axes.
Source
double getMaxScaleOnAxis() {
final scaleXSq = _m4storage[0] * _m4storage[0] +
_m4storage[1] * _m4storage[1] +
_m4storage[2] * _m4storage[2];
final scaleYSq = _m4storage[4] * _m4storage[4] +
_m4storage[5] * _m4storage[5] +
_m4storage[6] * _m4storage[6];
final scaleZSq = _m4storage[8] * _m4storage[8] +
_m4storage[9] * _m4storage[9] +
_m4storage[10] * _m4storage[10];
return Math.sqrt(Math.max(scaleXSq, Math.max(scaleYSq, scaleZSq)));
}