[Bf-python] Object/Mesh constructors

[David Jagoe]

Hi Campbell,

On 8 July 2010 15:36, Campbell Barton <ideasman42 at gmail.com> wrote:
> mesh = bpy.data.meshes.new(name="Foo")
> obj = bpy.data.objects.new(name="Foo", object_data=mesh)
> bpy.context.scene.objects.link(obj)

Thanks for your quick response, this seems to be exactly what I'm
after. Your example seems to work as expected, and creates a mesh with
0 vertices. I have been experimenting with adding vertices and faces -
so far without success. I came across the following code:

# 		me = bpy.data.meshes.new()
# 		ob = sce.objects.new(me)
		
# 		me.verts.extend([V(bb[0]).resize3D(), V(bb[1]).resize3D(),
V(bb[2]).resize3D(), V(bb[3]).resize3D()])
# 		me.faces.extend([(0,1,2,3),])
# 		me.verts.extend([V(uv[0]).resize3D(), V(uv[1]).resize3D(),
V(uv[2]).resize3D()])
# 		me.faces.extend([(4,5,6),])

Which doesn't work in blender 2.5:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
AttributeError: 'bpy_prop_collection' object has no attribute 'extend'


So I tried the following:

>>> mesh.add_geometry(verts=4, edges=4, faces=1)

After which I can manipulate the vertices but there are no faces or edges:

>>> mesh.faces
<bpy_collection[0], Mesh.faces>

>>> mesh.edges
<bpy_collection[0], Mesh.edges>

Any advice? My final goal is to end up with a rectangular plane in
that same way as doing Add > Mesh > Plane in the GUI would do.


Thanks again.
Cheers,
David

>
> On Thu, Jul 8, 2010 at 2:57 PM, David Jagoe <davidjagoe at gmail.com> wrote:
>> G'day all,
>>
>> Is there a better way to add an object than using bpy.ops.object_add
>> or (e.g) bpy.ops.mesh.primitive_plane_add?
>>
>> I've tried to use bpy.types.Mesh.
>>
>> Ideally I would like something like a normal factory or constructor
>> method that returns the object to me so that I can manipulate it
>> further. I imagine that such a facility must exist but I can't seem to
>> find it.
>>
>>
>> Thanks,
>> David
>> _______________________________________________
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>>
>
>
>
> --
> - Campbell
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