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Thanks for the suggestions! It took me a few days to think this through and try some things.

Indeed, per your suggestion I have tried deltas for x,y,z, although they don't all fit in 8 bits (some deltas will of course overflow 16-bit as well), so I use a variable width int (8, 16, or 32 bit), which was a pretty big win, even after compression.

The bitwise transposition you refer to is interesting, but was complex and didn't change things much once xz got ahold of it.


In reply to Re^2: Specialized data compression by wanna_code_perl
in thread Specialized data compression by wanna_code_perl

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