Faces wires are open?

[yorik]

It looks like sometimes wires around faces are open... For example make a parametric part cube, and look at each of its wires, isClosed() returns false. The same goes for some other objects such as booleans. If you make a face specifically out of a closed wire then its wire is closed. Werner if you have a second, can you check? I'm not sure if its something we have control upon, or an OCC bug...

[wmayer]

I have no idea why this happens. For me it seems to be a OCC bug. For me it happens when creating a parametric and non-parametric box. Is it the same for your?

import Part
box=Part.makeBox(10,10,10)
for i in box.Wires:
print i.isClosed()

The funny thing is when I do

Code: Select all

w=Part.Wire(i.Edges)
w.isClosed() # returns true

[yorik]

Yes, that's very curious... It seems the only way to obtain a closed wire around a face is to specifically make it from a closed wire
I'll have a look if this is the case too in pythonOCC, so we know its in OCC itself...

[wmayer]

This is a very simple example which also says that the wires are open.

Code: Select all

        BRepPrimAPI_MakeBox mkBox(10,10,10);
        TopoDS_Shape box = mkBox.Shape();
        TopExp_Explorer xp(box,TopAbs_WIRE);
        while (xp.More())
        {
            Standard_Boolean closed = xp.Current().Closed();
            closed = BRep_Tool::IsClosed(xp.Current());
            xp.Next();
        }

So, it must be an OCC thing.

[yorik]

Yes it gives the same result in pythonOCC too...
There is no bug tracker in OCC but I'll post something on the forum...