Cube  Diff

	int steps = (int)(sqrt(dx * dx + dy * dy) / 0.9);
	if (!steps)
		return false;
	float x = lx;
	float y = ly;
	int i = 0;
	for (;;) {
		struct sqr *s = S(fast_f2nat(x), fast_f2nat(y));
		struct sqr *s = S((int)x, (int)y);
		if (SOLID(s))
			break;
		float floor = s->floor;
		if (s->type == FHF)
			floor -= s->vdelta / 4.0f;
		float ceil = s->ceil;
		if (s->type == CHF)