boundary command problems

[JERRY HUPERTZ]

I'm sure that somebody has seen this problem before. When picking an
internal point for the "boundary" or "bhatch" command I get the
following error messages:
Invalid Hatch Boundary
Point Is Outside of Boundary
Boundary Is Not Closed
etc., etc.
There is no apparent reason that I can see for this to happen. When I
check the perimeter of the area I want to create a boundary for, it is
closed and the command should work. I am using R14, but I have been
encountering this problem since R12. If anybody knows why this happens
or what I can do do fix the problem, I would greatly appreciate it.

Thank you in advance,
Jerry Hupertz

[Peter Tobey]

Jerry;

Yes the BPOLY engine is finicky, to say the least. My 3 cents:

One common problem occurs when working in drawings at large distances
from the origin. If this is the case, set a temporary UCS whose origin
is near or within the boundary you want to create.

Explicitly selecting the objects you want the command to use can help
when there is a chance of confusion.

Also, the command line version offers an option to specifiy a "ray"
direction, which I believe gives the routine its initial search
direction. Choose "Advanced options" "Island detection" "N" "Angle" and
pick 2 points to specify an angle. It may be just superstition on my
part, but I believe I've had greater success when the ray from the
"Internal point" points toward an "open" object (line, open polyline)
than when it points to a closed polyline.

This "ray" angle defaults to "Nearest", so even with the dialog version
you may be better off to pick a point nearer to an "open" object. In any
case, if you are not having it detect islands, then you should pick a
point and/or specify an angle that will find your perimeter boundary
first.

Good luck...

-peter

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Sometimes you feel like a hunter-gatherer, sometimes you don't...

[Aaron Rumple]

A pline that doubles back on itself will cause problems.
(...just one of many rewasons the command may produce this error.)

JERRY HUPERTZ <W...@BBLINK.NET> wrote in message
news:366D54...@BBLINK.NET...

[Stephan Koster]

Jerry,

sometimes I had problems with the boundary command when
I used LWPOLYLINES. After converting them to heavy polylines
the problem had gone.
If you use LWPOLYLINES, try to convert them with the command
"convertpoly" and the option "heavy".

There are other problems with LWPOLYLINES, for example
you cannot break a closed LWPOLYLINE in one point.
If you set the variable "plinetype" to zero, AutoCAD will create
only heavy polylines (this is not true for the command "rectang"
- must be a bug in AutoCAD).

Stephan