Python BRep sample

[Danielm103]

from pyrx import Ap, Ax, Db, Ed, Ge, Br


# iter faces
@Ap.Command()
def doit1():
    ps, id, _ = Ed.Editor.entSel("\nPick it: ", Db.Solid3d.desc())
    if ps != Ed.PromptStatus.eOk:
        raise RuntimeError("oof {}:".format(ps))
    dbs = Db.Solid3d(id)
    brs = Br.Brep(dbs)
    ft = Br.FaceTraverser(brs)
    for face in ft.getFaces():
        print(face.getArea())


# iter edges
@Ap.Command()
def doit2() -> None:
    ps, id, pnt = Ed.Editor.entSel("\nSelect: ", Db.Solid3d.desc())
    if ps != Ed.PromptStatus.eOk:
        raise RuntimeError("oof {}:".format(ps))

    dbent = Db.Entity(id)
    brep = Br.Brep(dbent)
    et = Br.EdgeTraverser()
    et.setBrep(brep)

    while not et.done():
        edge = et.getEdge()
        curveType = edge.getCurveType()
        excurve = Ge.ExternalCurve3d.cast(edge.getCurve())
        if curveType == Ge.EntityId.kLineSeg3d:
            seg = Ge.LineSeg3d.cast(excurve.getNativeCurve())
            print(seg.length(), seg.startPoint(), seg.endPoint())
        elif curveType == Ge.EntityId.kCircArc3d:
            carc = Ge.CircArc3d.cast(excurve.getNativeCurve())
            print(carc.center(), carc.radius())
        et.next()


# iter faces and edges
@Ap.Command()
def doit3() -> None:
    # 1. Prompt user to select a 3D solid
    ps, id, pnt = Ed.Editor.entSel("\nSelect Solid: ", Db.Solid3d.desc())
    if ps != Ed.PromptStatus.eOk:
        raise RuntimeError("Selection failed: {}".format(ps))

    # 2. Get the Solid entity and open its Boundary Representation (B-rep)
    dbs = Db.Solid3d(id)
    brs = Br.Brep(dbs)

    # 3. Step 1: Traverse the solid's Faces
    ft = Br.FaceTraverser(brs)
    face_index = 1

    for face in ft.getFaces():
        # --- NEW FACE METRIC EXTRACTION ---
        try:
            face_area = face.getArea()
            surf_type = face.getSurfaceType()  # E.g., kPlane, kCylinder, etc.
            print(f"\n--- Face #{face_index} | Type: {surf_type} | Area: {face_area:.4f} ---")
        except Exception as e:
            print(f"\n--- Face #{face_index} (Failed to fetch area metrics: {e}) ---")

        face_index += 1
        # ----------------------------------

        # 4. Step 2: Step down from Face to its Loops
        flt = Br.FaceLoopTraverser()
        flt.setFace(face)
        while not flt.done():
            loop = flt.getLoop()

            # 5. Step 3: Step down from Loop to its Edges (using LoopEdgeTraverser)
            let = Br.LoopEdgeTraverser()
            let.setLoop(loop)
            while not let.done():
                edge = let.getEdge()

                # 6. Extract and evaluate the Edge geometry
                curveType = edge.getCurveType()
                excurve = Ge.ExternalCurve3d.cast(edge.getCurve())

                if curveType == Ge.EntityId.kLineSeg3d:
                    seg = Ge.LineSeg3d.cast(excurve.getNativeCurve())
                    print("  Line:", seg.length(), seg.startPoint(), seg.endPoint())

                elif curveType == Ge.EntityId.kCircArc3d:
                    carc = Ge.CircArc3d.cast(excurve.getNativeCurve())
                    print("  Arc:", carc.center(), carc.radius())

                # Move to next Edge inside this loop
                let.next()

            # Move to next Loop inside this face
            flt.next()

 

output for a 3d box

 

Command: DOIT3
Select Solid:
--- Face #1 | Type: kPlane | Area: 6095.4620 ---
  Line: 60.13854242043337 (103.70522552029884,68.98463275333243,46.66742774827728) (103.70522552029884,8.84609033289907,46.66742774827728)
  Line: 101.35699658327584 (2.34822893702299,68.98463275333243,46.66742774827728) (103.70522552029884,68.98463275333243,46.66742774827728)
  Line: 60.13854242043337 (2.34822893702299,8.84609033289907,46.66742774827728) (2.34822893702299,68.98463275333243,46.66742774827728)
  Line: 101.35699658327584 (103.70522552029884,8.84609033289907,46.66742774827728) (2.34822893702299,8.84609033289907,46.66742774827728)
--- Face #2 | Type: kPlane | Area: 6095.4620 ---
  Line: 60.13854242043337 (103.70522552029884,8.84609033289907,0.00000000000000) (103.70522552029884,68.98463275333243,0.00000000000000)
  Line: 101.35699658327584 (2.34822893702299,8.84609033289907,0.00000000000000) (103.70522552029884,8.84609033289907,0.00000000000000)
  Line: 60.13854242043337 (2.34822893702299,68.98463275333243,0.00000000000000) (2.34822893702299,8.84609033289907,0.00000000000000)
  Line: 101.35699658327584 (103.70522552029884,68.98463275333243,0.00000000000000) (2.34822893702299,68.98463275333243,0.00000000000000)
--- Face #3 | Type: kPlane | Area: 4730.0703 ---
  Line: 46.66742774827728 (2.34822893702299,68.98463275333243,46.66742774827728) (2.34822893702299,68.98463275333243,0.00000000000000)
  Line: 101.35699658327584 (2.34822893702299,68.98463275333243,46.66742774827728) (103.70522552029884,68.98463275333243,46.66742774827728)
  Line: 46.66742774827728 (103.70522552029884,68.98463275333243,46.66742774827728) (103.70522552029884,68.98463275333243,0.00000000000000)
  Line: 101.35699658327584 (103.70522552029884,68.98463275333243,0.00000000000000) (2.34822893702299,68.98463275333243,0.00000000000000)
--- Face #4 | Type: kPlane | Area: 2806.5111 ---
  Line: 46.66742774827728 (2.34822893702299,8.84609033289907,46.66742774827728) (2.34822893702299,8.84609033289907,0.00000000000000)
  Line: 60.13854242043337 (2.34822893702299,8.84609033289907,46.66742774827728) (2.34822893702299,68.98463275333243,46.66742774827728)
  Line: 46.66742774827728 (2.34822893702299,68.98463275333243,46.66742774827728) (2.34822893702299,68.98463275333243,0.00000000000000)
  Line: 60.13854242043337 (2.34822893702299,68.98463275333243,0.00000000000000) (2.34822893702299,8.84609033289907,0.00000000000000)
--- Face #5 | Type: kPlane | Area: 4730.0703 ---
  Line: 46.66742774827728 (103.70522552029884,8.84609033289907,46.66742774827728) (103.70522552029884,8.84609033289907,0.00000000000000)
  Line: 101.35699658327584 (103.70522552029884,8.84609033289907,46.66742774827728) (2.34822893702299,8.84609033289907,46.66742774827728)
  Line: 46.66742774827728 (2.34822893702299,8.84609033289907,46.66742774827728) (2.34822893702299,8.84609033289907,0.00000000000000)
  Line: 101.35699658327584 (2.34822893702299,8.84609033289907,0.00000000000000) (103.70522552029884,8.84609033289907,0.00000000000000)
--- Face #6 | Type: kPlane | Area: 2806.5111 ---
  Line: 46.66742774827728 (103.70522552029884,68.98463275333243,46.66742774827728) (103.70522552029884,68.98463275333243,0.00000000000000)
  Line: 60.13854242043337 (103.70522552029884,68.98463275333243,46.66742774827728) (103.70522552029884,8.84609033289907,46.66742774827728)
  Line: 46.66742774827728 (103.70522552029884,8.84609033289907,46.66742774827728) (103.70522552029884,8.84609033289907,0.00000000000000)
  Line: 60.13854242043337 (103.70522552029884,8.84609033289907,0.00000000000000) (103.70522552029884,68.98463275333243,0.00000000000000)

 

[Danielm103]

output for a cylinder

 

Command: DOIT3
Select Solid:
--- Face #1 | Type: kCylinder | Area: 428514.2140 ---
  Arc: (440.88076870446724,537.54943936113841,0.00000000000000) 198.3154183465131
  Arc: (440.88076870446724,537.54943936113841,343.89739291260162) 198.3154183465131
--- Face #2 | Type: kPlane | Area: 123555.7137 ---
  Arc: (440.88076870446724,537.54943936113841,0.00000000000000) 198.3154183465131
--- Face #3 | Type: kPlane | Area: 123555.7137 ---
  Arc: (440.88076870446724,537.54943936113841,343.89739291260162) 198.3154183465131