Translating Bottle example to OCP

[Dov Grobgeld]

Hello,

While trying to learn OCCT and the OCP binding, I tried converting the MakeBottle example to pure OCP.

However I got stuck on how to convert a Shape to a Wire:

  aTrsf.SetMirror(xAxis)
  aBRepTrsf = BRepBuilderAPI_Transform (aWire, aTrsf)
  aMirroredShape = aBRepTrsf.Shape()
  aMirroredWire = TopoDS_Wire(aMirroredShape) # Doesn't work!

I tried inspecting the cadquery sources, and saw that it is using a “pycapsule” class Wire_s to do the casting. But I don’t understand where this symbol comes from. There is no such function in TopoDS nor TopoDS_Wire. If I import cadquery I can do the casting through cq.Shape.cast(amirroredShape), but I’m curious how this works?

Thanks in advance!

[Jeremy Wright]

I believe the "_s" means that it's a static function. It is created as part of the binding generation.

Jeremy

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[Dov Grobgeld]

Thanks Jeremy. I found the answer, and I’ll leave the answer here for posterity.

I was erroneously looking for Wire_s() in OCP.TopoDS, while it is in OCP.TopoDS.TopoDS.

So a pure OCP casting from a OCP.TopoDS.TopoDS_Shape to a OCP.TopoDS.TopoDS_Wire (when the shape represents a wire) looks like the following:

from OCP.TopoDS import TopoDS

aBRepTrsf = BRepBuilderAPI_Transform (aWire, aTrsf);
aMirroredWire = TopoDS.Wire_s(aBRepTrsf.Shape())

Regards,