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Active Member
jetpro
Posts: 6
Registered: ‎12-06-2002
Message 1 of 5 (33 Views)

Sweep problem

33 Views, 4 Replies
11-25-2002 01:37 PM
Hi to All

Why cannot I sweep 2d objects aloung a path if they are nor circles???
I have a 3D projected geometry for the path and I have a 4 sided 2D shape to be swept and it just does not want to do the right thing!!!
WHY???

Is it only because it does not have a center point???

Thanks

Joe
*Howard, Jeff
Message 2 of 5 (33 Views)

Re: Sweep problem

11-25-2002 03:05 PM in reply to: jetpro
What's "the right thing"? 8~)

The most common cause of a kernel failure is if the profile is self
intersecting. To best picture this imagine (if it's not there to see) the rad
ctr for that particular spot in the path. If that point is inside the profile
as it transverses that particular spot on the path the operation will fail.
(Or, something like that.) This is sometimes not true for line segment paths,
but that gets complicated.

By their nature (or the nature of the sweep algorithms), 3d paths will cause
the profile to "twist" as if follows the path. Again, picturing the points
the path is curved (for various instantaneous points on the curve) about (or
augmented lines, if you are familiar with them) will make this easier to
understand.

If you have something you can post to CF, maybe someone can offer something
specific or an alternate method.

Jeff
====================

"jetpro" wrote in message news:f12759e.-1@WebX.maYIadrTaRb...
Hi to All
Why cannot I sweep 2d objects aloung a path if they are nor circles???
I have a 3D projected geometry for the path and I have a 4 sided 2D shape to
be swept and it just does not want to do the right thing!!!
WHY???

Is it only because it does not have a center point???

Thanks

Joe
Distinguished Contributor
SveinE
Posts: 449
Registered: ‎12-09-2003
Message 3 of 5 (33 Views)

Re: Sweep problem

11-25-2002 03:07 PM in reply to: jetpro
Post it to CF so that others can take a look at it.


Regards Svein
Active Member
jetpro
Posts: 6
Registered: ‎12-06-2002
Message 4 of 5 (33 Views)

Re:

11-26-2002 12:34 AM in reply to: jetpro
Thanks and I've posted the problem on CF under the the subject of SWEEP PROBLEM
*Howard, Jeff
Message 5 of 5 (33 Views)

Re:

11-26-2002 06:45 AM in reply to: jetpro
Sorry, can't offer anything specific from the example, as the sweep solves and
does pretty much what I'd expect (though, each 3d sweep is a little bit of a
surprise; sometimes what I want, sometimes not). If you can offer a specific
problem and desired results possibly....

BTW, you are using 6, aren't you (file you posted was 5)? Would hate to spend
the time on a solution that you can't see and there's a big difference in
capabilities.

Good luck with it,
Jeff
===================


"jetpro" wrote in message news:f12759e.2@WebX.maYIadrTaRb...
Thanks and I've posted the problem on CF under the the subject of SWEEP
PROBLEM
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