Fri, 02/20/2009 - 11:45
Forums:
I have two closed sections (basically 2 polygons in YZ plane), how do I Loft through the two sections? There isn't any sample provided. Can anybody pls help. Thanks in advance.
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Fri, 02/20/2009 - 13:30
BRepOffsetAPI_ThruSections
Fri, 02/20/2009 - 15:20
Thanks Gheorghiu, but now how do I get each edge from the added wire to the BRepOffsetAPI_ThruSections object. I have constructed the wire by adding gp_Pnts to BRepLib_MakePolygon.
gp_Pnt aPnt4(50, 10, 20);
gp_Pnt aPnt5(50, 100, 50);
gp_Pnt aPnt6(50, 50, 90);
BRepLib_MakePolygon aPoly1;
aPoly1.Add(aPnt4);
aPoly1.Add(aPnt5);
aPoly1.Add(aPnt6);
TopoDS_Wire aWire = aPoly.Wire();
I need all the edges from this wire to get the
GeneratedFace(const TopoDS_Shape& Edge) shape objects for each of the edge.
Sat, 02/21/2009 - 15:50
But this is not a closed section...
You should repeat first point to the end to close the section.
aPoly1.Add(aPnt4);
aPoly1.Add(aPnt5);
aPoly1.Add(aPnt6);
aPoly1.Add(aPnt4);
And another thing, do you want to extrude along a line path (BRepPrimAPI_MakePrism) or along a 3d and possibly curved path (BRepOffsetAPI_ThruSections)?
It is difficult for me to understand "lofting" concept
Mon, 02/23/2009 - 02:27
Its true for a closed section it should be a closed polygon;
aPoly1.Close() or the method which you have stated above. So I have two closed sections on a 3D plane and I have to loft through the sections.
You can visit this page
http://www.opencascade.org/showroom/demos/ and check how the concept of lofting works.
Mon, 02/23/2009 - 23:39
I do like following code, thanks to Volker and Roman:
TopoDS_Shape pipe;
BRepOffsetAPI_ThruSections thePipe(Standard_True, Standard_True);
thePipe.AddWire(theSection);
...
thePipe.AddWire(theSection);
thePipe.Build();
if (thePipe.IsDone()) pipe = thePipe.Shape();
But, I have still a case that I can not solve: To create a irregular torus, for instance.
I asked for that, but nobody could help me.