boolean evenRow = false;
type = 0;
for y=0.0 to yMax step yStep do
	if (evenRow) type = type1;
	else type = type2;
	evenRow = !evenRow;
	for z=0.0 to zMax step zStep do
		for x=0.0 to xMax step xStep do
			положи_кирпич_по_координатам(x,y,z);
		done
	done
done