Sets the entire matrix to the matrix in arg.
Source
void setFrom(Matrix4 arg) {
final argStorage = arg._m4storage;
_m4storage[15] = argStorage[15];
_m4storage[14] = argStorage[14];
_m4storage[13] = argStorage[13];
_m4storage[12] = argStorage[12];
_m4storage[11] = argStorage[11];
_m4storage[10] = argStorage[10];
_m4storage[9] = argStorage[9];
_m4storage[8] = argStorage[8];
_m4storage[7] = argStorage[7];
_m4storage[6] = argStorage[6];
_m4storage[5] = argStorage[5];
_m4storage[4] = argStorage[4];
_m4storage[3] = argStorage[3];
_m4storage[2] = argStorage[2];
_m4storage[1] = argStorage[1];
_m4storage[0] = argStorage[0];
}