Wed, 03/12/2025 - 14:32
OBJ files do not contain BRep data; instead, they represent tessellated geometric data consisting of triangular information.
I want to enable HLR mode for this, but when I run it, I get all the edges from the triangles. (First picture in Image "Sewing_before_after.jpg")
To create a face from the triangulation data:
I extract the points from the triangulation and use them to create TopoDS_Face.
Then, I use BRepBuilderAPI_Sewing to sew all the faces together.
However, the sewing algorithm only works when the faces are oriented in same direction. For curved surfaces, I am unable to merge multiple triangles into a single smooth surface.
You can refer to Image "Sewing_before_after.jpg" for reference.
The expected output I am aiming for is shown in Image 2.
Thu, 05/08/2025 - 10:44
I moved to using ASSIMP for importing objects, then used Poly_Triangulation to convert them to TopoDS_Shape.
Was getting too many 'oddities' when trying to use the OpenCascade internal importers.
Thu, 05/08/2025 - 12:20
In your context of Mesh To CAD operation I do not see relation with Obj import. Obj reader generates relevant structure and correct from Obj specification.
Converting mesh to CAD and operation with it - is not a stable and usual task. For that case need to find HLR based on mesh calculation.
Could you please specify which exactly "oddities" for Obj import did you find.