Restore panoramas (cubic tiles) from exported Pano2VR

With this simple little script you can restore the full size cubic faces of the panorama which was exported using Pano2VR.

Pretty useful, if you deleted the original by mistake ;)

To convert the cubic projection back to equirectangular, you can also use Pano2VR, but for the input source you choose "Cubic", load all six cube faces, and export transformation.


Pano2VR's panoramas are exported as tiles in a cubic projection. The file naming scheme is as follows:
c[CUBE FACE]_l[RESOLUTION LEVEL]_[X]_[Y].jpg
for example:
c0_l0_0_0.jpg.

The most detailed resolution level is "0", so that level is used, and other tiles are disregarded.
Cube faces range from 0 to 5, and X and Y are the row and column number.

The script is written in PHP, and should be run in a CLI.

error_reporting(E_ALL);
ini_set('display_errors', 1);
ini_set('memory_limit', '2G');
date_default_timezone_set('Europe/Ljubljana');

$dir = 'tiles/';

foreach(range(0,5) as $c) {
 $i = 0;
 $tiles = array();
 $height = 0;
 do {
  $width = 0;
  $j = 0;
  do {
   $fn = fname($c,$i,$j);
   if(file_exists($fn)) {
    $tiles[$i][$j] = $fn;
    list($w, $h) = getimagesize($fn);
    $width += $w;
   }
   $j++;
  } while(file_exists(fname($c,$i,$j)));
  $j--;
  $i++;
  $height += $h;
 } while(file_exists(fname($c,$i,$j)));
 $i--;
 
 echo $width.' '.$height."\n";
 $im = imagecreatetruecolor($width, $height);
 $y = 0;
 foreach($tiles as $row) {
  $x = 0;
  foreach($row as $tile) {
   $tile = imagecreatefromjpeg($tile);
   $src_w = imagesx($tile);
   $src_h = imagesy($tile);
   imagecopy($im, $tile, $x, $y, 0, 0, $src_w, $src_h);
   $x += $src_w;
   imagedestroy($tile);
  }
  $y += $src_h;
 }
 imagejpeg($im, "$c.jpg", 70);
}

function fname($c,$i,$j) {
 global $dir;
 return "{$dir}c{$c}_l0_{$i}_{$j}.jpg";
}

Tiles

Restored cube faces

Restored panorama