[Bf-python] Some bpy.types Custom Properties Are Read-Only

[Khalifa Lame]

That's a good place to start! I was reluctant to look into BMesh because I
thought the bmesh data was only temporary and volatile. It looks that way
especially because you have to create the bmesh object yourself.

Thank you very much.

On Thu, Jun 30, 2016 at 5:06 PM, Bastien Montagne <montagne29 at wanadoo.fr>
wrote:

> Using BMesh you can use custom data layers (see
> https://www.blender.org/api/blender_python_api_2_77_0/bmesh.types.html#custom-data-layer-access
> ) - generic int/float/string ones.
>
> Beyond that not much to do, mesh items have no uid at all, outside of
> bmesh I guess you could encode some data into a vgroup e.g. (for vertices
> at least), but that’s rather limited and hackish.
>
> Le 30/06/2016 à 17:35, Khalifa Lame a écrit :
>
> Alternatively, do those mesh elements have internal unique constant IDs i
> can access? Indices change all the time (I believe), so they are not a
> reliable way to identify mesh elements.
>
> On Thu, Jun 30, 2016 at 3:21 PM, Khalifa Lame <khalibloo at gmail.com> wrote:
>
>> Ah, that explains a lot. An error message during prop creation would have
>> been very helpful. So what options (if any) do I have? Verts, edges and
>> faces do have individual properties like bevel and crease weights. How were
>> those properties created? Can I somehow squeeze in my own custom properties
>> as well?
>>
>> On Thu, Jun 30, 2016 at 1:11 PM, Bastien Montagne <
>> <montagne29 at wanadoo.fr>montagne29 at wanadoo.fr> wrote:
>>
>>> ID properties are only available for IDs (and a few other special cases,
>>> like bones and some UI classes). Other types just do not support them at
>>> all.
>>>
>>> To check wether a type supports ID properties, just try to use one of
>>> its mapping protocol item (e.g. C.object.keys() works, while
>>> C.object.vertex_groups[0].keys() does not).
>>>
>>> Le 30/06/2016 à 13:08, Khalifa Lame a écrit :
>>>
>>> Hi. I need assign custom properties to mesh vertices, edges and faces.
>>> It doesn't throw any errors on creation of the custom props, but after
>>> they've been created, they don't behave as one would expect. They are
>>> read-only tuples rather than bpy.props.IntProperty() for example.
>>>
>>> For comparison, here's the normal behavior of a custom property
>>>
>>>
>>> Here's what I get on certain bpy.types
>>>
>>> ​An unusable tuple!
>>>
>>> And if I try to assign a value, I get
>>>
>>> ​
>>>
>>> Is there a reason for this? Is there a known workaround or hack? I
>>> really do need to store custom props on vertices, edges, faces and vertex
>>> groups.
>>> ​
>>>
>>> --
>>> khalibloo®
>>>
>>>
>>>
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>>
>>
>> --
>> khalibloo®
>>
>>
>
>
> --
> khalibloo®
>
>
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-- 
khalibloo®
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