the .bnd files contain min and max values at each output time. smokeview uses this to compute color indices (number between ( 0 and 255) to color data
time min_val max_val
we use run length encoding to compress 3d smoke data. the .
s3d.sz files contain information about the size of uncompressed and compressed smoke data at each time step . smokeview uses this to allocate memory and to read in data
time uncompressed size, compressed size
in both cases it is more efficient more smokeview to obtain this information by having it in an ascii text file rather than embedded and spread throughout a binary data file