Hi, I've just done some thinking about patching POV-Ray to do df3
output.
What I'm considering is to render an animation and writing the output to
the df3 file.  The tricky bit I'd like to do is to allow subset renders
to be inserted into the appropriate part of the file, so the following
algo. writes out a complete file even if a subset render is done.

If anyone has already done this or if you see any probs with this
algorithm, please let me know.

if file exists
  if (dimensions different) or (not subset render)
    make new file

if new file
  write header

if current frame > frames in file
  seek to end of file
  write blank frames

seek to offset for current frame
render current frame to file

Cheers, PoD.

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