[mykkujinu2201]

Dear forums,

As far as I know, vertex points can be accessed through mesh.points()[cellID].
However, I want to know how to access vertex point directly from faceID.
Furthermore, I want to get vertex coordinates for further calculation.

1. Is there a way to access pointID from faceID or vice versa?
2. Is there a way to access point coordinates from pointID?

primitvePatch seems to be related to this issue but I do not know exactly.

Best,
Jun

[olesen]

Originally Posted by mykkujinu2201

Dear forums,

As far as I know, vertex points can be accessed through mesh.points()[cellID].
However, I want to know how to access vertex point directly from faceID.
Furthermore, I want to get vertex coordinates for further calculation.

1. Is there a way to access pointID from faceID or vice versa?
2. Is there a way to access point coordinates from pointID?

primitvePatch seems to be related to this issue but I do not know exactly.

Best,
Jun

It becomes quite easy once you understand how things are put together in OpenFOAM. A face is just a collection of labels (vertex indices) - it doesn't really care what it indexes into.


Suppose you have a face "f" from that you know is from the mesh. In that case the coordinates associated with the face are simply those from the mesh.

const label faceId = 100;   // face Id in mesh
const face& f = mesh.faces()[faceId];   // face in mesh

Info<< "face point 0: " << f[0] << nl;
Info<< "face point 0 coordinate: " << mesh.points()[ f[0] ] << nl;

[mykkujinu2201]

Dear Olesen,

Thank you for the reply.

I have more question.

If I am going to compute values at faces using the neighbour and the owner cells in parallel computation, will it work also? or should I do some other treatment?

Best,
Jun