I ran a rough test (I don't have the tripod) and determined that my
NPP was displaced by approximately 10cm - which caused about a 4px
pixel error for mid-range objects. It's really neat that object
distance can be estimated from pixel error.

I've noticed that enblend is 99% of the stiching process; furthermore
it seems severely limited by disk-io. If enblend is swapping to disk
due to a memory limit then the enblend manually describes how to
increase the limit; is this a good idea? I run a 4GB system of which
3.25GB are available to user processes; enblend uses 28%, 932MB very
near to the 1GB limit. If I increase the limit to 2.5GB or 2.25GB will
it create a noticeable speed-up? On the other hand, if enblend is
simply writing to disk, then I'd like to know how much space on-disk
it uses/requires - to where is it writing? Therefore maybe I can
create a 1.5GB ramdisk.. which begs the question, if the ramdisk
becomes full, will enblend fall back to another partition?

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