User:Wfpokorny/DensityFile/df3XYZsizeBashExample

The following bash script will run on many operating systems. Place the lines between the two "cut here" lines into a file called df3xyzsize.sh and save it.

Run it, for example, with the command:

bash df3xyzsize.sh spiral.df3

which should output the lines:

50
50
5

assuming the spiral.df3 is that shipped with POV-Ray.

----------------------------------------------- cut here ------------------------------------------
#!/bin/bash
#----------------------------------------------
# Convert the first 6 bytes of df3 file to a hex string which is 
# then cut into three parts corresponding to the three unsigned, two  
# byte integers. Each of these four character hex strings is then
# converted to an integer value and returned in x, y, z order. 
#----------------------------------------------

  echo $((16#`head -c 6 $1 | xxd -p | head -c 4`))
  echo $((16#`head -c 6 $1 | xxd -p | tail -c 9 | head -c 4`))
  echo $((16#`head -c 6 $1 | xxd -p | tail -c 5 | head -c 4`))

exit 0
----------------------------------------------- cut here ------------------------------------------