[Bf-python] Activation of the material slots

[geof kgeo]

I think you'll have a error if the mesh is hided and maybe if the mesh is on a no-visible layer.kgeogeo

> Date: Sun, 6 May 2012 21:24:24 +0200
> From: codemanx at gmx.de
> To: bf-python at blender.org
> Subject: Re: [Bf-python] Activation of the material slots
> 
> my bad, it should use the current object to set active_material_index 
> and needs to set the ob as the scene's active object before calling the 
> slot remove operator. Should work for multiple objects now:
> 
> 
> import bpy
> 
> bpy.ops.object.mode_set(mode='OBJECT', toggle=False)
> 
> for ob in bpy.data.objects:
>        if ob.type != 'MESH' or not ob.select:
>            continue
> 
>        mat_slots = {}
>        for p in ob.data.polygons:
>            mat_slots[p.material_index] = 1
> 
>        mat_slots = mat_slots.keys()
> 
>        for i in range(len(ob.material_slots)-1, -1, -1):
>            if i not in mat_slots:
>                ob.active_material_index = i
>                bpy.context.scene.objects.active = ob
>                bpy.ops.object.material_slot_remove()
> 
> Am 03.05.2012 17:56, schrieb Jean Montambeault:
> > Le 2012-05-02 18:22, CoDEmanX a écrit :
> >> I wrote a small script, which should remove unused materials from
> >> material slots of all selected objects:
> >>
> >> import bpy
> >>
> >> bpy.ops.object.mode_set(mode='OBJECT', toggle=False)
> >>
> >> for ob in bpy.context.selected_objects:
> >>        if ob.type != 'MESH':
> >>            continue
> >>
> >>        mat_slots = {}
> >>        for p in ob.data.polygons:
> >>            mat_slots[p.material_index] = 1
> >>
> >>        mat_slots = mat_slots.keys()
> >>
> >>        for i in range(len(ob.material_slots)-1, -1, -1):
> >>            if i not in mat_slots:
> >>                bpy.context.object.active_material_index = i
> >>                bpy.ops.object.material_slot_remove()
> >>
> >> seems to work well...
> >>
> > Thank you for your answer. :)
> >
> > Yes it does work very well on one object at a time. For a selection, not
> > so well here. Unfortunately I have only three minutes of freedom left
> > for now. I'll explore the causes when I'm back in about 10 hours time
> > and let you know the results. In any case your script has everything to
> > solve the problem for me in the most elegant manner that is afforded to
> > us by the API. Yeah!
> >
> > J.
> >
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