I was able to prevent the crash and get the operation to work with no regressions on the public, occt data.
blobfish occt

Thanks. Does upstream OCC pick your fixes ? No. I didn't sign the CLA, so I don't submit any changes. If I find an obvious bug and feel confident in a fix, I make the change and push it to gitlab. For bugs beyond my time/ability, I file a bug report to occt for them to ignore. ;) Interesting is tha...

marioalexis wrote: ↑Sun Feb 27, 2022 2:29 pm There is a bug in the Open Cascade function ElSLib::ConeDN.
...

fix

1) fillet horizontal edge
2) variable blend around previous blend. *
3) trim back front.
4) blend vertical edge.

* I think variable blends can be done in fillet/part workbench? I didn't use freecad, but did use opencascade so same modeling kernel.

I totally agree with you. But at the moment we have only very limited possibilities for real surface reconstructions and this is a (poor) way of getting a shape. Although such a shape can't be used for most operations afterwards there are a few cases where it is still good enough. I assumed you sha...

The algorithm above is much faster because beforehand it creates two containers for all vertexes and all edges and then it creates a face for each triangle that already shares the same vertex/edge as its adjacent triangles. Only with this change the computation time goes down by around a third. As ...

They've added a test case to verify its presence -- when I have a few minutes I'll re-run it and see if the "pure" bug is resolved. It may be that this was really fixed by an unsubmitted "blobfish" patch, in which case theirs should stay open. It is possible one of my changes fi...

And by "hot spots" you mean a "BVH-box"? Or the smallest non divadeble feature? I.e a vertex, a curve, a line, a face etc.? (the BVH-box being the smallest possible box circum-scribing the sectioned feature) No hotspot in the code stack: How much slower is framerate when enablin...

But all those BRepBuilderAPI_* and BRepPrismAPI_* are constructors for BRepBuilderAPI_* and BRepPrismAPI_* classes in accordance with the headers. Where are those classes related with TopoDS_* classes? Yes the constructor is getting called and then a conversion operator is called implicitly. Conver...

Anyone who can push this diskussion forward as seen from a programmers view point? For example the possible use of BVH versus section border? Any other techniques or tricks, besides BVH, we can exploit? Assuming we are talking about dynamic sectioning of the 3d view, which after 13 posts I am still...