0002669: Bad boolean operations on shapes

ID	Project	Category	View Status	Date Submitted	Last Update

0002669	PartDesign	Bug	public	2016-08-14 07:54	2016-08-14 10:38

Reporter	worldmaker	Assigned To
Priority	normal	Severity	minor	Reproducibility	always
Status	closed	Resolution	no change required
OS	Windows 7
Product Version	0.16
Fixed in Version	0.17

Summary	0002669: Bad boolean operations on shapes
Description	the boolean operations(common/fuse/cut) on two spheres have weird results.
Steps To Reproduce	1. Open FreeCAD 2. Press the "create new document" button 3. enter the python codes: import Part s1 = Part.makeSphere(5, FreeCAD.Vector(5,0,0)) s2 = Part.makeSphere(5, FreeCAD.Vector(0,5,0)) s3 = s1.fuse(s2) Part.show(s3) FreeCADGui.SendMsgToActiveView("ViewFit")
Additional Information	OS: Windows 7 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.17.7745 (Git) Build type: Release Branch: master Hash: 79dcdfbc782e24bb34db882143af7ce8ebd237bd Python version: 2.7.8 Qt version: 4.8.7 Coin version: 4.0.0a OCC version: 6.8.0.oce-0.17
Tags	No tags attached.

FreeCAD Information

worldmaker 2016-08-14 07:54 reporter	bug.png (212,805 bytes) bug.png (212,805 bytes)

wmayer 2016-08-14 10:30 administrator ~0007267	Works without problems with: OS: Windows 7 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.17.8202 (Git) Build type: Release Branch: master Hash: 4790648065190df1ea3a415e3293d0a05a4550ad Python version: 2.7.8 Qt version: 4.8.7 Coin version: 4.0.0a OCC version: 7.0.0 However, with this version it does not even show a result: OS: Windows 7 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.17.6726 (Git) Build type: Release Branch: master Hash: 8aaae0ba2225d052d580e504d73707cb60e91717 Python version: 2.7.6 Qt version: 4.8.5 Coin version: 4.0.0a OCC version: 6.6.0 I guess it's related to the OCC version. When slightly changing the center of one sphere it works again: `import Part s1 = Part.makeSphere(5, FreeCAD.Vector(5.0001,0,0)) s2 = Part.makeSphere(5, FreeCAD.Vector(0,5,0)) s3 = s1.fuse(s2) Part.show(s3)` I guess that's a bug in previous OCC versions which we can't fix. It looks like the problem is that the seam edge of the one sphere touches the other sphere.

wmayer 2016-08-14 10:38 administrator ~0007268	Can't be fixed inside FreeCAD, you must upgrade to a newer OCC version. It works at least from v7.0.0.

Date Modified	Username	Field	Change
2016-08-14 07:54	worldmaker	New Issue
2016-08-14 07:54	worldmaker	File Added: bug.png
2016-08-14 10:30	wmayer	Note Added: 0007267
2016-08-14 10:38	wmayer	Note Added: 0007268
2016-08-14 10:38	wmayer	Status	new => closed
2016-08-14 10:38	wmayer	Resolution	open => no change required
2016-08-14 10:38	wmayer	Fixed in Version	=> 0.17