[Bf-python] BMesh API

[CoDEmanX]

Couldn't you add 4 faces.layers.float (vmax, vmin,hmax, hmin) ?


Am 24.04.2013 11:57, schrieb Treyer Lukas:
> Dear mailing list readers
>
> For some reason the only doc I found yesterday on google about custom layers was "blah blah" in the the BMesh API<http://www.blender.org/documentation/blender_python_api_2_63_5/bmesh.types.html#bmesh.types.BMVertSeq.layers>.
> Now with the the help of CoDEmanX, I discovered custom layers in Bmesh.
>
> Just for clarification for "dumb" readers like me (an extension to the BMesh API Doc<http://www.blender.org/documentation/blender_python_api_2_63_2/bmesh.html#customdata-access>):
>
> bm.verts, bm.edges, bm.faces are not just a lists but they are of type
> bmesh.types.BMVertSeq, bmesh.types.BMEdgeSeq, bmesh.types.BMFaceSeq
>
> The access to custom data of a vert for instance is implemented in bmesh.types.BMVert
> and bmesh.types.VertSeq together.
>
> Let's say you want to store the coordinates of a bounding box of a BMFace.
> What I wanted to do in the first place was:
> bm.faces[0].b_rect = [vmax,vmin,hmax,hmin]
>
> Now with layers it looks a bit different:
> bm.faces[0][b_rect] = "we will come to the bounding box later"
> Note that the following will not work:
> bm.faces[0]['b_rect'] = "something"
>
> The layer needs to be accessed with the key generated by the face sequence as follows:
> key = bm.faces.layers.int.new("b_rect")
> bm.faces[0][key]  #read/write access
>
> You can retrieve the key by typing:
> key = bm.faces.layers.int['b_rect']
>
> Now what Campbell suggested to my problem was storing my complex data in a list and adding the index of the data in that list to my face as an int layer:
>
> MyData = []
> MyData.append([vmax,vmin,hmax,hmin])
> index = len(MyData)-1
>
> bm.faces[0][b_rect] = index
>
>
> I still hope that at some point I could extend the wrapper classes directly to store my data.
>
>
> Best, Lukas
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