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This returns a wrong result:

    Needs["OpenCascadeLink`"]
    Needs["NDSolve`FEM`"]
    shape = OpenCascadeShape[CapsuleShape[{{0, -2, 0}, {0, 0, 1}}, 1]];
    r = ImplicitRegion[x^4 + y^4 + z^4 - 1 == 0, {x, y, z}];
    bmesh = ToBoundaryMesh[r, {{-2, 2}, {-2, 2}, {-2, 2}}];
    shape2 = OpenCascadeShape[bmesh];
    union = OpenCascadeShapeUnion[shape2, shape];
    OpenCascadeShapeSurfaceMeshToBoundaryMesh[union]["Wireframe"]

but these

    r = ImplicitRegion[x^4 + y^4 + z^4 - 1 <= 0, {x, y, z}];
    r = ImplicitRegion[x^4 + y^4 + z^4 - 1 < 0, {x, y, z}];
    r = ImplicitRegion[x^4 + y^4 + z^4 - 1 > 0, {x, y, z}];
    r = ImplicitRegion[x^4 + y^4 + z^4 - 1 >= 0, {x, y, z}];

return the correct result. For the broken case either use

    r = ImplicitRegion[x^4 + y^4 + z^4 - 1 <= 0, {x, y, z}];

Or this workaround can be used:

mp = MeshPrimitives[DiscretizeRegion[r], 2];
shape2 = OpenCascadeShapeSewing[
   OpenCascadeShape[Polygon[#]] & /@ (Reverse /@ mp[[All, 1]])];

It might be useful if the OpenCascadeLink would also offer ref pages of the package symbols; beyond what is described in the tutorial.

I'm interested in meshing a segment from an image and exporting this as a STEP file, for example:

Meshing the image is pretty straightforward as in:
ToBoundaryMesh@DiscretizeRegion@ImageMesh@image
or
DiscretizeRegion@ImageMesh@image

Does OpenCascadeLink have a way of dealing with 2D shapes? I've been playing around with it a bit and haven't found any 2D shapes that OpenCascadeShape seems to recognize.

The goal is to get segments in a format suitable for direct import into ANSYS (STEP or IGES and maybe one other format).

I would like to compile the OpenCascadeLink to Mathematica 10.4 on the Windows X86-64 platform. However, I noticed that FindLibrary[] cannot load the DLL.

libDir = NotebookDirectory[] <> "open_cascade_prebuilt\\lib"

preLoadLibs = FileNames["*.*", libDir]

LibraryLoad @ preLoadLibs[[1]]

LibraryLoad @ preLoadLibs[[2]]

(*
  ibraryFunction::load: The library E:\Open-Cascade-Link\open_cascade_prebuilt/lib\TKBin.dll cannot be loaded. 
*)

success = FreeQ[Union[LibraryLoad /@ preLoadLibs], $Failed]

LibraryLink`$LibraryError

(*
   Library load error 126: cannot find the specified
*)

Screenshot

See issue #1. There are no options to control the normal directions (inward or outward pointing) of the shapes produced.

See issue #1. There appears to be no way to control accuracy of conversions.

While OpenCascadeLink is potentially a very useful tool, the current documentation is just a bunch of examples, and does not actually specify the arguments, options of each function.
For example, we are shown the call
bmesh1 = OpenCascadeShapeSurfaceMeshToBoundaryMesh[shape1]
but for serious real world use, we need to be able to specify accuracy / tolerance of the conversion process. How is that controlled?
(I am assuming that it can be controlled, which is of course essential).

A proper specification of each function is needed.