Help - my cave is inside-out

[Wookey]

+++ Wookey [04-12-27 23:59 +0000]:

>> +++ Martin Budaj [04-12-26 13:06 +0100]:
>
>>>> > > I'm getting the hang of this and have drawn up some cave. It went OK until
>>>> > > I got to a complicated section, with an underlying streamway adn overlying
>>>> > > passages. The streamway needs to be a separate scrap. But I haven't got
>>>> > > that far.
>
>>
>> Sorry to keep asking the group questions but I'm stuck again.
>>
>> I've updated the files online. I've added the scrap  containing the
>> underlying streamway. As soon as I add the underlying scrap and process I
>> get :
>> therion: error -- metapost exit code -- 256
>> This appears to be due to "! Paths 4 and 3 don't intersect."
>> But I have 5 aras in this scrap - how on earth do I work out which one is at
>> fault? The area 'show' button doesn't seem to work - is that a clue?


OK- I fixed this by comenting out areas until things worked again, but
there does need to be a better way.

That example (scrap bmb2_s3) has a streamway with sandbanks. Having got the
large water area to work, I find that some of the sandbanks are sandy, but
some are covered in water. What determines when an area follows the outer
wall, or the sandbank border? IS the only way to be sure to get the right
thing to split the wall at the sandbank?

This gets back to the problem that making changes to line which surround
areas is problematic - if you split a line that is part of an area then both
lines losetheir IDs and the area breaks. This is a tricky problem, but what
you really want is for the areas and lines to get re-written so they all
still work.

Wookey
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