Learning Forum

[angmyto]

My geometry has four layers and i only want to select the outer, exposed faces of one layer and apply a thermal condition to it. The area is wouldn't be a consistent value so I want it to be able to choose all faces of this layer that is exposed, but I wasn't sure how to do that. Right now I have all the faces of that specific component selected as an IFaceSelection

[NickFL]

It sounds like you already have these in a selection (I have assumed this selection is called sel). From there you could do something like this:

span = [] # Creates empty List
for face in sel.Faces:
   # finds the outer diameter of each face and adds to span
   span.append(face.Shape.BoxUV.RangeU.Span)

# Use zip to combine together into one
zippy = zip(sel.Faces, span)
# Reorders based on size of D (largest first)
sorted(zippy, key=lambda x: x[1])

# Now go thru zippy
for i in range(len(zippy)):
   face = FaceSelection.Create(zippy[i][0])
   # Create a Named Selection based on the face
   NamedSelection.Create(face, Selection.Empty())
   NamedSelection.Rename(“Gruppe1”, “ring_{0}”.format(i))

[angmyto]

When I try this it'll create multiple named selections and doesn't group them by similar faces. Possibly because there are different shapes and some faces are also curved? 

[NickFL]

This script takes the selection, assumed to be the four circle/annular faces you have in the picture. It then puts each of them in a named selection with ring_0 being the outermost one, ring_1 being the one with the second largest diameter, etc.

I guess I am confused by what you mean by similar faces. How do you want them grouped if not by diameter? (You said the outer one, so ring_0).

Note I am using the German version, so on the last line Gruppe1 might be Group1 in the English version. Other languages would also likely be different.