offset problem

hylkema's picture
hylkema
Fri, 03/07/2008 - 19:06
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Other usage issues

hello all,

I'm having a problem with BRepOffsetAPI_MakeOffset. Any ideas why this is crashing :

TopoDS_Wire *s2;
s2 = TopoDS::Wire(GetShape("Contour",ic));
BRepOffsetAPI_MakeOffset mkOffset(*s2)
mkOffset.Perform(dist);

GetShape returns a TopoDS_Shape (a wire) , dist is a real (0.001) an ic is an integer

It crashes, whatever I do. Please help

Jouke

hylkema's picture
hylkema
Fri, 03/07/2008 - 19:11

forgot to say that ther error message is
terminate called after throwing an instance of 'StdFail_NotDone'

hylkema's picture
hylkema
Mon, 03/10/2008 - 16:08

OK .. I figured out what the problem is. The wire consists of one single edge so the algorithm can not decide on what plane to use for the offset.
The question is now, how can I offset a single edge ?

Bill Chen's picture
Bill Chen
Wed, 05/21/2008 - 06:42

Maybe you can try Geom_OffsetCurve

zhangzhigang824's picture
zhangzhigang824
Mon, 09/21/2009 - 09:16

Hi,

You can specify a plane for offset, and then offset a single edge will OK.
The sample code is followed.

TopoDS_Face workingPlane = BRepBuilderAPI_MakeFace(gp_Pln(gp::Origin(),gp::DZ()));
BRepOffsetAPI_MakeOffset offset(workingPlane);
offset.AddWire(aWire);
offset.Perform(distance);
TopoDS_Shape newWire = offset.Shape();

Thanks!