rhinoscriptcontext.AddMaterialToObject(object_id) purges UserText

Hi,

I found that after running rhinoscriptcontext.AddMaterialToObject(object_id) to add a material to an object, all it’s Usertexts are purged:

import rhinoscriptsyntax as rs


id = rs.AddLine([0,0,0] , [1,1,1])

rs.SetUserText(id, 'foo', 'bar')


print 'foo value : {}'.format(rs.GetUserText(id, 'foo'))

rs.AddMaterialToObject(id)

print 'foo value : {}'.format(rs.GetUserText(id, 'foo'))

printout:
foo value : bar
foo value : None

Edit @Dale I found the cause in the reply by @clement

the rhinoscript method fails to create a Duplicate of the attributes:

attr = rhino_object.Attributes

should be

attr = rhino_object.Attributes.Duplicate()

For then the code works as expected

-Willem

Hi @Willem, thats a strange one. I think that the object itself gets not properly updated. If i use the exact same code as rs.AddMaterialToObject(id) in a seperate function, it works.

def AddMaterialToObjectEx(object_id):
    rhino_object = rs.coercerhinoobject(object_id, True, True)
    attr = rhino_object.Attributes.Duplicate()
    if attr.MaterialSource != Rhino.DocObjects.ObjectMaterialSource.MaterialFromObject:
        attr.MaterialSource = Rhino.DocObjects.ObjectMaterialSource.MaterialFromObject
        scriptcontext.doc.Objects.ModifyAttributes(rhino_object, attr, True)
        attr = rhino_object.Attributes
    material_index = attr.MaterialIndex
    if material_index>-1: return material_index
    material_index = scriptcontext.doc.Materials.Add()
    attr.MaterialIndex = material_index
    scriptcontext.doc.Objects.ModifyAttributes(rhino_object, attr, True)
    return material_index

prints this:

foo value : bar
foo value : bar

_
c.

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