public Matrix4f initIdentity() {
		for (int i = 0; i < 4; i++) {
			for (int j = 0; j < 4; j++) {
				int entry;
				if (i == j) {
					entry = 1;
				} else {
					entry = 0;
				}
				m[i][j] = entry;
			}
		}
		return this;
	}