sub method
Subtracts o from this.
Implementation
void sub(Matrix4 o) {
final Float64List oStorage = o._m4storage;
_m4storage[0] = _m4storage[0] - oStorage[0];
_m4storage[1] = _m4storage[1] - oStorage[1];
_m4storage[2] = _m4storage[2] - oStorage[2];
_m4storage[3] = _m4storage[3] - oStorage[3];
_m4storage[4] = _m4storage[4] - oStorage[4];
_m4storage[5] = _m4storage[5] - oStorage[5];
_m4storage[6] = _m4storage[6] - oStorage[6];
_m4storage[7] = _m4storage[7] - oStorage[7];
_m4storage[8] = _m4storage[8] - oStorage[8];
_m4storage[9] = _m4storage[9] - oStorage[9];
_m4storage[10] = _m4storage[10] - oStorage[10];
_m4storage[11] = _m4storage[11] - oStorage[11];
_m4storage[12] = _m4storage[12] - oStorage[12];
_m4storage[13] = _m4storage[13] - oStorage[13];
_m4storage[14] = _m4storage[14] - oStorage[14];
_m4storage[15] = _m4storage[15] - oStorage[15];
}