How to get Faces Aligned with a Direction and Located at the "Top" of the Body

Mike.Thompson

This example is how to get faces aligned with a direction and also located on the "top" of the body in that direction. You can see the type of faces in the image, aligned with the Z Direction. Notice one of the 3 blocks does not have a face selected because it it not oriented in line with the Z axis.
This is useful often when wanting to select these faces as cutters or to pull for some reason.
An example SC geometry file with script group is attached.

Shunya Hashimoto

Hi
I want to select faces by specific directions.So, I thinked i can use your method. But when i open and run your、 I had an error "attribute 'V20' of 'namespace#' object is read-only".

Do you have any solution?

Also, I read your script. I think your write about materials. How did you select "Top" face? If you can, Could you teach the method?

BR

Takahiro Yamaguchi

@Mike.Thompson Can you taka a look into Hashimoro-san's question?

Mike.Thompson

@Takahiro Yamaguchi , I have updated the original post to correct the attachment. The code is also posted below:

# Python Script, API Version = V20

"""
Get the top face in the Z Direction
"""

UserDirection = Direction.DirZ
DotTolerance = 0.9999

TopFaces=[]
for B in GetRootPart().GetAllBodies():
    ZFaces = []
    for F in B.Faces:
        Norm = F.GetFaceNormal(0,0)
        Dot = Vector.Dot(Norm.UnitVector, UserDirection.UnitVector) 
        if Dot > DotTolerance:
            Z = F.GetFacePoint(0,0)[2]
            ZFaces.append([F,Z])
    if len(ZFaces)>0:
        ZFaces.sort(key=lambda V: V[1])
        TopFaces.append(ZFaces[-1][0])
Selection.Create(TopFaces).SetActive()

Takahiro Yamaguchi

@Mike.Thompson Thank you! It was works fine to me.

Takahiro Yamaguchi

@Mike.Thompson If I want to select the X direction, what should I change?

Mike.Thompson

At the top of the script is: UserDirection = Direction.DirZ

You can change this to UserDirection = Direction.DirX, or you can specify any arbitrary direction with XYZ like Direction.Create(0.5,0.8,1.596)