SelCylinder: is it a possible command?

Rhino
1

Hello,

Is there a command to select Cylinders in Rhino? As in, those objects created with the ‘Cylinder’ command?

Thanks,

Dan

2

Some discussion happening here:
Scripting SelBox and SelVolumeSphere - Scripting - McNeel Forum

3

No. It’s just a NURBS surface.
Unlike applications like AutoCAD, Rhino does not use a bunch of different object types. You may have to get creative to select them specifically.

4

With some ChatGPT help

import rhinoscriptsyntax as rs
import scriptcontext as sc
import Rhino.Geometry as rg

def select_extrusions_with_circle_profiles():
    # Get all the extrusion objects in the document
    extrusion_objects = rs.ObjectsByType(rs.filter.extrusion)
    
    # Create an empty list to store the selected extrusion objects
    selected_extrusions = []
    
    # Cycle through each extrusion object
    for extrusion_obj in extrusion_objects:
        # Check if the profile curves of the extrusion are circles
        if is_circle_profile(extrusion_obj):
            # Add the extrusion to the selected list
            selected_extrusions.append(extrusion_obj)
    
    # Select the extrusion objects with circle profiles
    rs.SelectObjects(selected_extrusions)

def is_circle_profile(extrusion_obj):
    # Get the underlying Brep object of the extrusion
    brep = rs.coercerhinoobject(extrusion_obj).Geometry.ToBrep()
    
    # Get the edges of the Brep
    edges = brep.Edges
    
    # Check if any edge is a circle curve
    for edge in edges:
        if edge.IsCircle():
            return True
    
    return False

# Call the function to select extrusions with circle profiles
select_extrusions_with_circle_profiles()
5

Hi Dan - Cylinders are generic ‘extrusion objects’ by default - they are not tagged by how they are created. It would be possible to do some fancy checking in a script to find things that are probably created by Cylinder but it would not be possible to, for example, distinguish cylinders created by Cylinder from extruded circles.
@lignindes - here’s a thing that may help -

SelCylinder.py (1.3 KB)

To use the script set up a macro like so, that you can put on a button or alias:

! _-RunPythonScript “Full path to py file inside double quotes”

-Pascal

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