[brlcad-tracker] [ brlcad-Bugs-3011209 ] (pipe - box) fails

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Bugs item #3011209, was opened at 2010-06-03 16:33
Message generated for change (Tracker Item Submitted) made by gilliganu
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Category: Geometry Editing
Group: serious bug / workaround
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Richard Uschold (gilliganu)
Assigned to: Nobody/Anonymous (nobody)
Summary: (pipe - box) fails

Initial Comment:
I tried to create a half cylinder from a pipe by subtracting a box, this fails. The box is the EXACT same length as the cylinder.

mged> l tst2PxJointMbox.c
tst2PxJointMbox.c:  --
   u tst2PxJoint.s
   - tst2Pbox.s

mged> l tst2PxJoint.s
tst2PxJoint.s:  pipe with 2 points
	0 	bend radius = 0.15  od=0.2
	  at=(-0.1, 0, 0.1)
	1 	bend radius = 0.15  od=0.2
	  at=(0.1, 0, 0.1)

mged> l tst2Pbox.s
tst2Pbox.s:  ARB8
	1 (0.1, -0.1, 0)
	2 (0.1, 0.1, 0)
	3 (0.1, 0.1, 0.1)
	4 (0.1, -0.1, 0.1)
	5 (-0.1, -0.1, 0)
	6 (-0.1, 0.1, 0)
	7 (-0.1, 0.1, 0.1)
	8 (-0.1, -0.1, 0.1)

mged> ev tst2PxJointMbox.c
/tst2PxJointMbox.c/tst2PxJoint.s:
 {tst2PxJoint.s} - {tst2Pbox.s}
Dangling faces detected in rA after boolean

nmg_bool() Dangling faces detected after boolean

1WARNING: Boolean evaluation of /tst2PxJointMbox.c/tst2PxJoint.s failed!!!

-----------------------

workaround:

If I make the box a little longer than the cylinder, it works fine. This may not be applicable for all situations, but works for me, now.

Good box:
mged> l tst2Pbox.s
tst2Pbox.s:  ARB8
	1 (0.15, -0.1, 0)
	2 (0.15, 0.1, 0)
	3 (0.15, 0.1, 0.1)
	4 (0.15, -0.1, 0.1)
	5 (-0.15, -0.1, 0)
	6 (-0.15, 0.1, 0)
	7 (-0.15, 0.1, 0.1)
	8 (-0.15, -0.1, 0.1)

brlcad version 7.12.2, the latest available on the Mac OS X

Gilligan


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You can respond by visiting: 
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