>  From the 7z manual:
> 
> "pass={NumPasses}
>     Sets number of passes for Deflate encoder. It can be in range from 1 
> to 15 for Deflate and from 1 to 10 for BZip2. Usually big number gives a 
> little bit better compression ratio and slower compression process."
> 
> As it turns out, the correct flag was -mpass=15, and it makes 
> compression take significantly longer without noticeably reducing the 
> file size (nearly double the time for a 0.1% size improvement).
> 

Sounds like increasing isosurface accuracy, antialiasing recursion 
level, max_trace_level to numbers where you don't see the extra 
reflections anyway, etc. :)

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