[brlcad-tracker] [ brlcad-Bugs-2052656 ] crashing whis nmg_collapse and nmg_simplify

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Bugs item #2052656, was opened at 2008-08-15 01:46
Message generated for change (Comment added) made by johnranderson
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Category: Geometry Conversion
Group: crash or data loss
>Status: Closed
>Resolution: Fixed
Priority: 3
Private: No
Submitted By: Nicolau Werneck (nwerneck)
>Assigned to: John Anderson (johnranderson)
Summary: crashing whis nmg_collapse and nmg_simplify

Initial Comment:
I have a BRL file that I converted from a IGES original using iges-g with the -t option.

When I run the nmg_collapse I get this error:

ERROR: bad pointer xa79ae70: s/b face_g_plane(x726b6e65), was face_g_snurb(x736e7262), file nmg_tri.c, line 453

nmg_simplify gives:

ERROR: bad pointer x97e1ea8: s/b face_g_plane(x726b6e65), was face_g_snurb(x736e7262), file nmg_mod.c, line 138

I had similar errors using versions 7.12.2, 7.10.4, and also the 7.8.4 debian package.

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>Comment By: John Anderson (johnranderson)
Date: 2008-09-30 13:45

Message:
The nmg_collapse and nmg_simplify commands were developed for use with nmg
objects that have only planar faces. I have modified the two commands so
that they check their input NMG primitive and refuse to operate on an NMG
with non-planar faces.

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Comment By: Sean Morrison (brlcad)
Date: 2008-08-24 02:34

Message:
Logged In: YES 
user_id=785737
Originator: NO

This is a known problem with the nurbs options on the iges converter. 
That's an experimental code path that was frankly never taken to
completion.  We're currently working on a new brep implementation that
should help fix this problem, but it's a huge development effort that is
going to take a while to complete.

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You can respond by visiting: 
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