[Bf-python] Mesh Module

[Gilbert, Joseph]

You need to think about how people will want to use this with the math
classes. Doing math on returned lists is not as fun.

.verts, .edges, can be py_objects subclassed from py_list which all
implement the sequence protocol. 

-----Original Message-----
From: bf-python-bounces at projects.blender.org
[mailto:bf-python-bounces at projects.blender.org] On Behalf Of Willian
Padovani Germano
Sent: Tuesday, October 04, 2005 3:39 PM
To: Blender Foundation Python list
Subject: Re: [Bf-python] Mesh Module

Ken Hughes wrote:
> I'm still trying to figure out the best 
> way to handle sequence operators (assignments in particular) while
still 
> keeping things "thin" and not messing up how meshes are referred to 
> elsewhere in Blender.

Hi Ken, opening our discussion to the group.

This is where the pure Python types could come in. Example for verts:

Add to Mesh a PyVert type, similar to NMVert.

Add function to create it: Mesh.Vert(arg), where arg could be a list of 
coordinates or a vector.

Then assignment can be made with these pyverts:

newvert = Mesh.Vert([x,y,z])
mesh.verts[n] = newvert

They can also be used when the coder needs more control of (a slice of) 
mesh.verts, with a mesh.verts.get() or .copy() or simply 
mesh.verts[start:end], if the code gets all updated to use pyverts. Ex:

myverts = mesh.verts.get() # gets a list with copies of the verts
# now you can do whatever with myverts:
# add or remove from anywhere in the list, append, extend, etc.
# Then:
mesh.verts = myverts # pass changes back to Blender

If the user forgets or doesn't want to pass the changes back to Blender,

no problem. Since it's a "pylist of pyverts", Python itself takes care 
of getting rid of the data once its ref count reaches zero (otherwise 
it's a buggy Python version).

Not thin as direct access, but with control of the quantity of data to 
work on at a time and no need to grab/transform the whole mesh, but 
simply the data you need at that time, it might be a good approach.

-- 
Willian

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