RhinoCommon - Pre-and Post- select subobjects

@Helvetosaur wrote:

Last one for today - I am trying to figure out how to include a preselected set of subobjects (say, brep edges) into a selection process where one can continue selecting more edges and removing some of the existing ones from the selection.

I have tested many different variations, the best I have been able to do is run the process twice, once to get the preselection, and once to get the post selection, but I don’t know how to be able to interact with the preselected ones after (in case I want to deselect some).

The end goal is that the preselected subobjects will be chosen programmatically, not by hand, but for testing one can simply preselect a few with Ctrl+Shift+Pick. then in the script, I want to ask the user to edit the selection, either adding to or subtracting from it.

The following works for pre- or post selction, but not both. I have tried a bunch of other stuff, but to keep things short here, I will not post them all.

import Rhino
import scriptcontext
import rhinoscriptsyntax as rs

def TestSO(prompt,filt):
    go = Rhino.Input.Custom.GetObject()
    go.SetCommandPrompt(prompt)
    go.GeometryFilter=filt
    go.SubObjectSelect=True
    go.ChooseOneQuestion = True
    go.GetMultiple(1,0)
    if go.CommandResult()!=Rhino.Commands.Result.Success:
        return go.CommandResult()
    objrefs = go.Objects()
    if not objrefs: return Rhino.Commands.Result.Nothing
    rc=[]
    for objref in objrefs:
        indices=[]
        for item in objref.Object().GetSelectedSubObjects():
            #select subobject
            objref.Object().SelectSubObject(item, True, True, True)
            #append index to return
            indices.append(item.Index)
        rc.append([objref.ObjectId,indices])
    return rc

prompt="Select some brep edges"
result=TestSO(prompt,Rhino.DocObjects.ObjectType.Curve)
print "{} edges selected".format(len(result))

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