Scripts: tilemap.py

#
# Make copies of a map and show subregions to cover the entire original map.
# This is to allow display of 2-d planes larger than the maximum OpenGL
# texture size (typically 8192 pixels along each axis).
#
# Use this script by opening the map to be tiled, then opening the script.
#

def tile_map(v, max_size = 8192, overlap = 1):

  tsize = max_size - overlap
  ti, tj, tk = [1 + ((s-1) / tsize) for s in v.data.size]
  tiles = ti*tj*tk
  if tiles == 1:
    return
  maps = [v] + [v.copy() for t in range(tiles-1)]
  ijk_step = (1,1,1)
  for k in range(tk):
    for j in range(tj):
      for i in range(ti):
        ijk_min = [s*tsize for s in (i,j,k)]
        ijk_max = [(s+1)*tsize+overlap for s in (i,j,k)]
        v = maps[k*ti*tj + j*ti + i]
        v.new_region(ijk_min, ijk_max, ijk_step, adjust_step = False)

import VolumeViewer
v = VolumeViewer.active_volume()
if v:
  tile_map(v)