real*8 minx1, miny1, minz1, maxx1, maxy1, maxz1
real*8 minx2, miny2, minz2, maxx2, maxy2, maxz2
real*8 distx1, disty1, distz1, distx2, disty2, distz2
real*8 minx1, miny1, minz1, maxx1, maxy1, maxz1
real*8 minx2, miny2, minz2, maxx2, maxy2, maxz2
real*8 distx1, disty1, distz1, distx2, disty2, distz2