Get Subobject in Rhino Common

yiliang · November 6, 2025, 6:34pm

Hi,

I want to make my subobject selection behavior emulates the Fillet command, which means users don’t have to hold Ctrl+Shift to activate sub-object selection. Is there a way to achieve that? GetObject.SubObjectSelect = true; won’t help on this.

Thanks!

nathanletwory · November 7, 2025, 3:00am

Please review the example

github.com/mcneel/rhino-developer-samples

rhinocommon/snippets/from_rhinocommon/cs/ex_extrudebrepface.cs

7ddbd3add


      
          partial class Examples
          {
            public static Rhino.Commands.Result ExtrudeBrepFace(Rhino.RhinoDoc doc)
            {
              Rhino.Input.Custom.GetObject go0 = new Rhino.Input.Custom.GetObject();
              go0.SetCommandPrompt("Select surface to extrude");
              go0.GeometryFilter = Rhino.DocObjects.ObjectType.Surface;
              go0.SubObjectSelect = true;
              go0.Get();
              if (go0.CommandResult() != Rhino.Commands.Result.Success)
                return go0.CommandResult();
          
              Rhino.Geometry.BrepFace face = go0.Object(0).Face();
              if (null == face)
                return Rhino.Commands.Result.Failure;
          
              Rhino.Input.Custom.GetObject go1 = new Rhino.Input.Custom.GetObject();
              go1.SetCommandPrompt("Select path curve");

Note that you have to set the appropriate geometry filter along with SubObjectSelect .

Here another one

github.com/mcneel/rhino-developer-samples

rhinocommon/cs/SampleCsCommands/SampleCsPointCloudPoints.cs

7ddbd3add


      
            /// GetPointCloudPoints
            /// </summary>
            class GetPointCloudPoints : GetObject
            {
              private readonly Guid m_object_id;
          
              public GetPointCloudPoints(Guid objectId)
              {
                m_object_id = objectId;
                GeometryFilter = ObjectType.Point;
                SubObjectSelect = true;
              }
          
              public override bool CustomGeometryFilter(RhinoObject obj, GeometryBase geom, ComponentIndex ci)
              {
                return (null != obj && obj.Id.Equals(m_object_id));
              }
            }
          
          }

You can check all the samples where SetObjectSelect = true: Code search results · GitHub

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Get Subobject in Rhino Common

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