[Bf-python] Thinmesh module, v1.1

[Ken Hughes]

Thought before I shut down for a day or so (heading out-of-town to 
relax) I'd taunt (or tempt? whatever) with today's thinmesh work.  I 
decided to implement a TMesh.addEdges() method which accepts a list of 
tuples of vertices and adds to the mesh.  This is part of an experiment 
to see if it's better or worse or indifferent to use Python's memory 
management vs my own.  (I didn't implement addVertices() yet; just 
created a bunch of vertices in Edit Mode and then ran a thinmesh script).

So you can do something like this:

    mesh = Blender.TMesh.Get('mesh')
    v=mesh.verts
    mesh.appendEdges( [ (v[0],v[1]), (v[1],v[2]), (v[2],v[0]) ] )

and you get edges.

Advantage of this: there's only one MEM_callocN() / memcpy() needed for 
this since I process the list of edges once (I order and sort both the 
new and old edge lists, remove duplicated edges, etc) I think it would 
be faster than:
    mesh.appendEdge(v[0],v[1])
    mesh.appendEdge(v[1],v[2])
    mesh.appendEdge(v[2],v[0])

But since I'm relying on Python to build my list of tuples (and assuming 
a more complex script is going to be using append() operations to build 
the actual list) I don't know which is more advantageous.  So later this 
weekend I'll try some tests with larger meshs and see what results.

Anyway, want to get users thinking about (and explain) how they create 
and edit meshes, and start getting some ideas for how things should 
proceed in the next step.

BTW, noticed that nobody's beating down the door to add comments to the 
wiki page I set up....

Back tomorrow night -- Ken