Get largest surface in polysurface

Scripting
1

Hi

Is there a way to select a polysurface and iterate through the faces to find the face or faces that are the largest in area?

Eric

2

Hi @eric.bunn,

below script extracts the brep face with largest area, note that it can take a while to calculate:

ExtractLargestBrepFace.py (920 Bytes)

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3

This will definitely work for me. Thank you.

Eric

4

Clement

Can you explain what this line of code does?

maximum, index = System.Double.MinValue, -1
rs.Prompt(“Calculating, please wait”)

Also, is their a way to return the bounding box information for the largest face as well?

Eric

5

Hello,

This line is setting two variables. Maximum is being initialised to the closest thing to negative infinity before each loop looks for a larger value. Index is being initialised to -1 as a sentinel value. If it is still -1 after the loop then something went wrong…

Graham

6

see the explanation of @Dancergraham, you can also write it in two lines eg:

maximum = System.Double.MinValue
index = -1

Yes, once you have the index of the largest brep face you can get it and return it’s bbox:

face = brep.Faces[index]
bbox = face.GetBoundingBox(True)

Note that this will give you an axis aligned boundingbox. To add it to the document you can use:

scriptcontext.doc.Objects.AddBrep(bbox.ToBrep())
scriptcontext.doc.Views.Redraw()

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7

Thanks again Clement. This will also work for me.

Eric