I’m trying to find the ngons in my Sub-D model. I can only find one, but the object description shows there are 3 5-gons.
Is there any command that I can use to find them more easily?
I found a way to narrow the ngons down to part of the mesh:
- Select a subset of the SubD faces.
- ExtractSrf on those faces.
- Look at the object description of the extracted surface and see if there are ngons present.
- (repeat)
Can you work with Grasshopper?
This might be helpful. This is a c# script that you can load into the Rhino 8 ScriptEditor and run that will work like a command that marks each mesh or subd ngon center with a text dot displaying its NGon edge count and can optionally mark triangles and quads as well via a command line option.
MarkNgons.cs (2.0 KB)
How do you run this in a button? I know ! _-RunPythonScript "script.py", is there something similar for c#?
I’ve looked at this page but I can’t find a solution for c#:
Integrating macros and scripts into your workspace [McNeel Wiki]
Hi @martinsiegrist ,
Use the command -ScriptEditor in Rhino 8 to load and run this one. Then put it in a button like this with your unique path for the file… -ScriptEditor R M:\Scripts\MarkNgons.cs
Hi @BrianJ this currently fails. In Rhino 8 it says Compile Error in the command line. In Rhino 9 I get this error message:
Compile Error
Assuming assembly reference 'System.Drawing.Primitives, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' used by 'RhinoCommon' matches identity 'System.Drawing.Primitives, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' of 'System.Drawing.Primitives', you may need to supply runtime policy (Warning CS1701) file:///:[1:1]
Assuming assembly reference 'System.Drawing.Primitives, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' used by 'Rhino.UI' matches identity 'System.Drawing.Primitives, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' of 'System.Drawing.Primitives', you may need to supply runtime policy (Warning CS1701) file:///:[1:1]
@Trav wrote that one and may have an idea.
@Trav it seems that also python scripts in buttons fail to execute at the moment. That’s in Rhino 9… can someone please take a look?
hmm this sounds like something Ehsan @eirannejad is likely working on with the script editor for v9.
Thanks for the information. Hopefully it’ll woork again soon.
@martinsiegrist Try adding this
// #! csharp Trav
#r "System.Drawing.Primitives.dll"
or this to the top of the script
// #! csharp Trav
#r "nuget: System.Drawing.Primitives, 4.3.0"
Doesn’t seem to help in a button. Does it work on your end?
Nope. Actually neither does help from macro 
Let me see what is wrong…
Ok good, neither helps here either. 
Okay found the bug. Add these lines
#r "RhinoCodePlugin.rhp"
#r "System.Drawing.Primitives.dll"
I will put a fix for this for the next 8.x
This problem is in Rhino 9 WIP
And unfortunately I could not get a button to work yet…
8.x has the same problem so it will be fixed in both. What’s the error you are seeing now?
For reference:
RH-86357 ScriptEditor command required ref to RhinoCodePlugin
It still works in script editor but fails in a button.
Command: -ScriptEditor
Select Option ( Edit Run Open ): Run
Path of script to run ( Browse ): “C:\Users\martinsiegrist\AppData\Roaming\McNeel\Rhinoceros\8.0\scripts\MarkNgons.cs”
Compile Error
Assuming assembly reference ‘System.Drawing.Primitives, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ used by ‘RhinoCommon’ matches identity ‘System.Drawing.Primitives, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ of ‘System.Drawing.Primitives’, you may need to supply runtime policy (Warning CS1701) file:///:[1:1]
Assuming assembly reference ‘System.Drawing.Primitives, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ used by ‘Rhino.UI’ matches identity ‘System.Drawing.Primitives, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ of ‘System.Drawing.Primitives’, you may need to supply runtime policy (Warning CS1701) file:///:[1:1]