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How to sweep along 2 spines

Vincent Zhang's picture

The 2 spines are connected but not G1 continuous at the common point.

I have tried the method below, but I just can't get the intended result.

    BRepOffsetAPI_MakePipeShell sheetFace(spineWire);
    sheetFace.Add(profile, true, true);
    TopoDS_Shape sheetShape = sheetFace.Shape();

I will be grateful for any help!