Change Mesh Edge Thickness from python

Scripting
,
1

Hi all!

I’m trying to change the Mesh Edge Thickness from a Rhino Display mode directly in Python. I could save a custom display mode somewhere in the server and use it company-wide but there are some IT issues that I cannot bypass at the moment, that’s why I need to change the display mode in each machine.

I can change the Mesh Wireframe Thickness using “DisplayAttributes.MeshSpecificAttributes.MeshWireThickness = int”, but that doesn’t overwrite the mesh edge thicknesses. If you set the MeshWireThickness to 0 but the MeshEdgeThickness is 2, edges will still show with a thickness of 2.

Does anybody know what’s the method to use and if it can be accessed via Python? I read the documentation, but the methods proposed do not work for Python so maybe I’m missing something out (https://developer.rhino3d.com/api/rhinocommon/rhino.display.displaypipelineattributes).

This is my code so far:

import Rhino

def SetMeshEdgeThickness(display_mode_name, edge_thickness):
    # Find the display mode by name
    display_mode = Rhino.Display.DisplayModeDescription.FindByName(display_mode_name)
    
    # Modify the mesh edge thickness
    display_mode.DisplayAttributes.MeshSpecificAttributes.MeshEdgeThickness = edge_thickness
    
    # Save the changes to the display mode
    if Rhino.Display.DisplayModeDescription.UpdateDisplayMode(display_mode):
        print("Set mesh edge thickness to {} for display mode '{}'.".format(edge_thickness, display_mode_name))
    else:
        print("Failed to update display mode '{}'.".format(display_mode_name))

# Example
SetMeshEdgeThickness("Shaded", 10)

And here is the error message:

Runtime error (MissingMemberException): 'MeshDisplayAttributes' object has no attribute 'MeshEdgeThickness'

Traceback:
  line 18, in SetMeshEdgeThickness, "<string>"
  line 27, in script
2

What Rhino version are you trying this with? It has been available only since August 2024 (committed to code in July 2024). So at least Rhino 8.12 is needed.

3

I was scripting it in Rhino 7, but it is also not working in my Rh8 version (Version 8 SR9
(8.9.24194.18121, 2024-07-12)). Is it a version problem?

4

Yes, I just mentioned you need at least Rhino 8.12

5

Hi @Pablo_Antuna_Molina, for Rhino 6 and 7 use MeshWireThickness instead of MeshEdgeThickness eg:

# for Rhino 6 and 7
display_mode.DisplayAttributes.MeshSpecificAttributes.MeshWireThickness

A small note, if the language your code runs on is non english, it could be that you cannot find the display mode by it’s english name. A workaround would be:

# find display mode by id
shaded_id = Rhino.Display.DisplayModeDescription.ShadedId
display_mode = Rhino.Display.DisplayModeDescription.GetDisplayMode(shaded_id)

_
c.

1 Like