I have several pieces of geometry, seemingly imported from some parametric modelling tool. They all have an ".ipt" in their object name. My original goal was to write a script that goes through all the objects in the scene, gets the object's dimensions, counts the number of vertices in a an object, compares it to the same parameters in the active object, and replaces object data if it finds a match. To that end I wrote the following:

from bpy import context

scene = bpy.context.scene

actob = bpy.context.selected_objects[0]
actobdat = bpy.context.selected_objects[0].data
ob = bpy.context.object
dimact = actob.dimensions
conapp = 0.007
actobvert = len(actobdat.vertices)

for ob in scene.objects:

    dimob = ob.dimensions
    obvert = len(ob.data.vertices)

    if abs(dimact[1] - dimob[1]) < conapp and abs(dimact[2] - dimob[2]) < conapp and abs(dimact[0] - dimob[0]) < conapp and actobvert == obvert:

        ob.select = True
        ob.data = actobdat

In response to this I received the following error message: AttributeError: 'NoneType' object has no attribute 'vertices'

I did some searching online, but still failed to solve the issue. Any help would be greatly appreciated! Thank you!

  • $\begingroup$ What objects do you have in your scene? And are you using actob = bpy.context.selected_objects[0] to get the active object? $\endgroup$ Jul 11, 2017 at 17:58
  • $\begingroup$ I have several identical (but not instance) meshes, that were imported from some parametrical modelling tool. The whole thing is a test for an ocasion when I will need to dig through a very large number of meshes, discern, which of them can use the same mesh data and apply said data to them. To answer your second point - yes, this is why I have this line here. Is that a wrong\inefficient method of doing so? Thank you! $\endgroup$
    – Nick Kaur
    Jul 12, 2017 at 11:18

1 Answer 1


It says 'NoneType' object has no attribute 'vertices', so it can be an empty that is being selected. You must check that the objects are meshes:

actob = bpy.context.active_object
if actob.type == 'MESH':
    actobdat = actob.data
    dimact = actob.dimensions
    for ob in scene.objects:
        if ob.type == 'MESH':
            dimob = ob.dimensions

You use bpy.context.active_object to get the active object, the index 0 of selected_objects will give you the last object added to the scene within the selection.

  • 1
    $\begingroup$ I would flip that condition, and do if actop.type ! = 'MESH': continue. That prevents yet another level of indentation. $\endgroup$
    – dr. Sybren
    Jul 15, 2017 at 6:52

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