Whether this will work correctly will depend upon how you are constructing your 1D array. Or rather, the source from which you are constructing it. Ie. If you are reading the data in from a file dumped from FORTRAN, you may need to invert the X and Z dimensions of the data.

I vaguely remember from my FORTRAN days, that the ordering of multi-dimensional array elements in FORTRAN is different from that in C. And I have no idea how that will translate to Perl's arrays.

#! perl -slw
use strict;
use Data::Dump qw[ pp ];

my @D1 = split ' ', do{ local $/; <DATA> };
pp \@D1;

my @D3 = map{
    my $z = $_;
    [ map{
        my $y = $_;
        [ @D1[ $z*9 + $y*3 .. $z*9 + $y*3 + 2 ] ]
    } 0 .. 2 ]
} 0 .. 2;

pp \@D3;

__DATA__
z0y0x0 z0y0x1 z0y0x2
z0y1x0 z0y1x1 z0y1x2
z0y2x0 z0y2x1 z0y2x2

z1y0x0 z1y0x1 z1y0x2
z1y1x0 z1y1x1 z1y1x2
z1y2x0 z1y2z1 z1y2x2

z2y0x0 z1y0x1 z2y0x2
z2y1x0 z2y1x1 z2y1x2
z2y2x0 z2y2x1 z2y2x2
[download]

Output:

c:\test>754307.pl
[
  "z0y0x0",
  "z0y0x1",
  "z0y0x2",
  "z0y1x0",
  "z0y1x1",
  "z0y1x2",
  "z0y2x0",
  "z0y2x1",
  "z0y2x2",
  "z1y0x0",
  "z1y0x1",
  "z1y0x2",
  "z1y1x0",
  "z1y1x1",
  "z1y1x2",
  "z1y2x0",
  "z1y2z1",
  "z1y2x2",
  "z2y0x0",
  "z1y0x1",
  "z2y0x2",
  "z2y1x0",
  "z2y1x1",
  "z2y1x2",
  "z2y2x0",
  "z2y2x1",
  "z2y2x2",
]

[
  [
    ["z0y0x0", "z0y0x1", "z0y0x2"],
    ["z0y1x0", "z0y1x1", "z0y1x2"],
    ["z0y2x0", "z0y2x1", "z0y2x2"],
  ],
  [
    ["z1y0x0", "z1y0x1", "z1y0x2"],
    ["z1y1x0", "z1y1x1", "z1y1x2"],
    ["z1y2x0", "z1y2z1", "z1y2x2"],
  ],
  [
    ["z2y0x0", "z1y0x1", "z2y0x2"],
    ["z2y1x0", "z2y1x1", "z2y1x2"],
    ["z2y2x0", "z2y2x1", "z2y2x2"],
  ],
]
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