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Brett · Guest

Hello all,

I am having a devil of a time creating a boundary region. I keep getting:

0 loops extracted
0 Regions created

I am having no problem creating a boundary hatch of the same elements,
but when I try to create a boundary region I get nothing. How can that
be? If the drawing elements are good enough to create a boundary hatch,
shouldn't they be good enough to create a boundary region?

What I have discovered so far is that the curved elements in these files
are made of pieces of arcs, ellipses, circles, etc. If I replace the
pieces with one spline I have no problem creating a boundary region.
But as pieces of arcs, etc. it will not create a region. My question
remains the same, why can I create a boundary hatch, but not a boundary
region from the same elements. I have checked and all elements are on
the same plane. I should also mention that I cannot PEDIT > JOIN the
elements. I fear that is an indication of the problem.

I'm panicking because I have hundreds and hundreds of files to process
the same way. Please help!!

BTW, what I'm attempting to accomplish is to extrude the elements to
create a 3D object. But of course, I can't extrude them unless they are
a closed PLINE or REGION. Hence my problem.

R2000/WIN 98

Thanks

Brett

madcadd · Guest

Hi Brett,

I too have ran into this problem. It seems that hatching will accept a bit looser tolerance in it's boundaries (sometimes, not always) where creating a region MUST be closed. Sometimes I have found that lines/arcs are doubled up and that is what screws up the region. I have drawn a line (as a guide) and moved each segment, one at a time via that line (or use a pre-determined length for each). This will show you duplication and give you a single version of the entities. Try regioning again and if it still fails, then with R=0, fillet each segment all the way around. Yes it is a giant PINB, butt...err I mean but what are ya' gonna do?

Brett · Guest

Thanks MadCad,

It is very frustrating having to clean up someone elses work. Your idea
about doing a fillet with R=0 was a good suggestion, if only it works on
all the problems.

I have another issue that is perplexing me now. When I try to create
the Boundary Region and then select the internal point, I get a Boundary
Definition Error: Point is outside of boundary. But I am definitely
clicking inside the object. In fact, I can click anywhere in the
drawing and I still get the same error. Any ideas about this one?

Thanks

Brett

Dean Saadallah · Guest

Your area is not closed, or the lines you see on screen are not all in the
same plane?

--
Dean Saadallah
Add-on products for LT
http://www.pendean.com/lt
--

Brett · Guest

Dean,

Thanks for your reply. I have checked and all elements are Z=0. What
I'm puzzled by is when I click anywhere on the drawing - inside or
outside of the elements I'm trying to make a region - I get the same
error: Point is outside boundary. How can that be?

Also, I don't suppose you know of a lisp that can locate lines that
don't quite intersect, and then make them intersect? That would
probably be too much to ask for. I have inherited a big mess that is
going to take forever to repair manually.

Thanks.

Brett

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