Netgen occ Pipe help \ where is user guide

Netgen
1

Hello, I am having trouble with learning to use the occ modelling and in general to learn ngsolve/netgen without a proper user guide… If there isn’t one, can someone point me to the file in github where I can see what the basic functionality and classes are without having to say help(thing) every time I am trying to understand something.
For instance, the current thing I am trying to do is make a pipe around a curve. I see on the main OCCT user guide some interesting optional arguments I would like to try. ie. CorrectedFrenet, ConstantBinormal, etc. Are these available?when I say help(Pipe) I see two optional args which I would like to try out,
twist: Optional[Tuple[netgen.libngpy._NgOCC.gp_Pnt, float]] = None,auxspine: Optional[netgen.libngpy._NgOCC.Wire] = Nonebut no examples of what the usage is… Specifically, how can I work with and define twist and can I do that by accessing the OCCT CorrectedFrenet etc options?

here’s another example of something along the same lines:Help on built-in function Circle in module netgen.libngpy._NgOCC:

Circle(…) method of builtins.PyCapsule instance
Circle(*args, **kwargs)
Overloaded function.

1. Circle(c: netgen.libngpy._NgOCC.gp_Pnt2d, r: float) -> netgen.libngpy._NgOCC.Geom2d_Curve

create 2d circle curve

2. Circle(arg0: netgen.libngpy._NgOCC.gp_Pnt, arg1: netgen.libngpy._NgOCC.gp_Dir, arg2: float) -> netgen.libngpy._NgOCC.Edge

the second way to construct a circle has no explanation of what the args represent. I assume and it might be arguable obvious that they are: center, normal, radius? or something like this but it’s not clear so it makes it hard to use…

Thank you.

2

Hi,
Occ wrapper is still quite fresh in Netgen and people are currently extending it on a by-need basis. The best way to find out whats happening is to go to the source code in netgen/libsrc/occ/python_occ_shapes.cpp . There the occ functionality is wrapped to python and you can see what occ functions are called and how. It should also be quite straightforward to extend this wrapper by additional things you need.