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

[Bastien Montagne]

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 
> <mailto: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 <mailto: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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>
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>
>
>     -- 
>     khalibloo®
>
>
>
>
> -- 
> khalibloo®
>
>
>
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