Source
void prependTranslation(num translationX, num translationY, num translationZ) {
_data[03] += m00 * translationX + m10 * translationY + m20 * translationZ;
_data[07] += m01 * translationX + m11 * translationY + m21 * translationZ;
_data[11] += m02 * translationX + m12 * translationY + m22 * translationZ;
_data[15] += m03 * translationX + m13 * translationY + m23 * translationZ;
}