FreeCADView Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0001566 | FreeCAD | Bug | public | 2014-05-25 16:18 | 2017-01-14 21:26 |
| Reporter | ulrich1a | Assigned To | |||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | closed | Resolution | fixed | ||
| Product Version | trunk | ||||
| Fixed in Version | 0.17 | ||||
| Summary | 0001566: Projection of a helix perpendicular to helix-axis fails | ||||
| Description | The Draft-workbench has the projection to make a 2D-projection of a shape. This fails for a helix. The same function is used in the Drawing-workbench. The Drawing-Workbench function fails too with "Fatal error occured while projecting shape". Surprisingly the Draft-Workbench function for making a Drawing-Projection works. Making a 2D-helix-projection works in FreeCAD 0.13.1828. So it seems to be a regression. | ||||
| Steps To Reproduce | Make a helix with height 5-times the pitch in the Part-workbench. Make a 2D-Projection in the Draft-workbench. It fails. | ||||
| Additional Information | raceback (most recent call last): File "/home/ulrich/Sourcen/FreeCAD/Build_20140504/Mod/Draft/Draft.py", line 4346, in execute obj.Shape = self.getProjected(obj,obj.Base.Shape,obj.Projection) File "/home/ulrich/Sourcen/FreeCAD/Build_20140504/Mod/Draft/Draft.py", line 4268, in getProjected groups = Drawing.projectEx(shape,direction) <type 'exceptions.Exception'>: Unknown C++ exception | ||||
| Tags | OCC Bug, upstream | ||||
| FreeCAD Information | |||||
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Apparently this seems to depend on the used OCC version. I got it only working with OCC 6.3 on Win32 but also compiled with the very latest FreeCAD sources. |
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When debugging through the OCC code the algorithm inside Update() of the class HLRBRep_Algo fails because it expects a face but there is none. In a certain way this seems logical because using an HLR (hidden line removal) algorithm for shapes without faces doesn't make too much sense. As replacement for these cases the class BRepProj_Projection could be used. |
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I think this is a regression in OCC. Such a function should just check for the existence of a face and if there is none, do not hide any line instead of throwing an exception. |
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http://tracker.dev.opencascade.org/view.php?id=25214 |
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Fixed upstream. According to OCC it's fixed in version 7.1 but this case works for me for version 7.0, too. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2014-05-25 16:18 | ulrich1a | New Issue | |
| 2014-05-29 17:44 | wmayer | Note Added: 0004728 | |
| 2014-05-29 22:13 | wmayer | Note Added: 0004730 | |
| 2014-06-19 20:22 | ulrich1a | Note Added: 0004758 | |
| 2014-09-29 10:50 | shoogen | Relationship added | related to 0001697 |
| 2014-09-29 10:56 | shoogen | Note Added: 0005165 | |
| 2016-12-18 19:34 | wmayer | Note Added: 0007531 | |
| 2016-12-18 19:34 | wmayer | Status | new => closed |
| 2016-12-18 19:34 | wmayer | Resolution | open => fixed |
| 2016-12-18 19:34 | wmayer | Fixed in Version | => 0.17 |
| 2017-01-14 21:26 | Kunda1 | Tag Attached: OCC Bug | |
| 2017-01-14 21:26 | Kunda1 | Tag Attached: upstream |
