Re: [brlcad-devel] conversion stats on a geometry motherload

[John A. <Da...@co...>]

Sean,

     I have attached a slightly modified version of conversion.sh for 
your consideration. This version only converts regions. I don't think we 
have ever had a primitive conversion failure, and converting 
combinations will just convert each region and primitive in the 
combination. So, converting every object results in converting 
everything many times. This change should considerably shorten the time 
it takes to run the script. What do you think?

     -John

On 12/03/2010 10:01 AM, Christopher Sean Morrison wrote:
> I've been putting geometry through the sh/conversion.sh script like
> wheat through a combine harvester and am now starting to get a good
> sense of our conversion rate.  For the past couple days, the script
> has been chewing through about two hundred real target description
> models and the failure rate is higher than our sample geometry as one
> would expect.
>
> It's still churning and not even 10% done, but so far more than 70000
> objects have been processed.  Of those, there are about 4000
> failures, 63000 successes, and 3000 timeouts when restricting
> conversions to a 5 second time limit.  That implies a worst case
> failure rate of 10.1% and a best case failure rate of 5.7%, which is
> considerably higher than our sample geometry's 2-4% failure rate.
> Moreover, the failures cascade up the model hierarchy meaning you're
> almost guaranteed to have a failure on top-level objects for a given
> model.
>
> The quasi good news is we now have a pretty stable framework for
> tracking progress, preventing regressions, evaluating conversion
> performance, and addressing the most common failure patterns first.
> One such common failure seen is NMG triangulation, which constitutes
> approximately 5-10% of the failures.
>
> If you want to test the script out on some geometry, the usage is
> very simple.  Just run:  sh/conversion.sh help
>
> I'll likely send a note out to the users list with a simplified
> summary of this information later today.
>
> Cheers!
> Sean
>
>
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