Preselecting Mesh Vertices?

@Jack_Minardi wrote:

I am attempting to write a python script that allows the user to preselect vertices on a mesh and then set their color. The code is pasted below. (It is modified from @pascal’s code found here.)

import Rhino
import rhinoscriptsyntax as rs
import scriptcontext as sc
from System import Drawing

def color_vertices():

    color= Drawing.Color.White
    if sc.sticky.has_key("CRNT_COLOR"):
        color = sc.sticky["CRNT_COLOR"]
    rc, color = Rhino.UI.Dialogs.ShowColorDialog(color)
    if not rc: return
    sc.sticky["CRNT_COLOR"] = color

    gv = Rhino.Input.Custom.GetObject()
    gv.SetCommandPrompt("Select one ore more mesh vertices. Hit Enter when done.")
    gv.GeometryFilter = Rhino.DocObjects.ObjectType.MeshVertex
    gv.EnablePreSelect(True, True)
    result = gv.GetMultiple(1,0)
    if( gv.CommandResult() != Rhino.Commands.Result.Success ):
            return

    mesh = gv.Object(0).Mesh()
    Id = gv.Object(0).ObjectId
    count = mesh.VertexColors.Count
    if count == 0:
        mesh.VertexColors.CreateMonotoneMesh(Drawing.Color.White)
        count = mesh.VertexColors.Count
    colors = [mesh.VertexColors[i] for i in range(count)]
    for objref in gv.Objects():
        idx = objref.GeometryComponentIndex.Index
        vList = [mesh.Vertices[i] for i in range (count)]
        idx = vList.index(mesh.TopologyVertices[idx])
        colors[idx] =  color
        mesh.VertexColors.Clear()

    for c in colors:
         mesh.VertexColors.Add(c)
    sc.doc.Objects.Replace(Id, mesh)
    sc.doc.Views.Redraw()

color_vertices()

If I create a mesh, turn PointsOn, select some points, and then run the script I would expect those selected points to be used, but instead I have to select points after running the script every time. (Note I am using gv.EnablePreSelect(True, True))

The high level goal here is to allow the user to work with all the selecting methods (SelBoundary, SelBrush, etc) so if there is some other way to achieve that goal I am willing to try.

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