[Bf-python] Efficient verts substitution

[Manuel Bastioni]

> What kind of operation, do you remove or add verts?  

I must done a series of rotations using a sequence like this pseudocode:

store initial verts position in A

def Rotations:
     start from A
     rotation 1
     rotation 2
     ...
     rotation n
     update mesh

The user can call Rotation all times he want.

Each time the function Rotation
modify the mesh, but  it starting always from
no modified A.



>If so, that would explain
> why the mesh.faces data got lost. Without having an idea of what you do in foo
> foo1 foo2, things look weird.  But ok, since you say the slower method works,
> then you're not "corrupting" the data in any way and can revert to the
> original coords.


However, this seem to work, but I think it's not efficient copy
all data:
------------------------------------------------
def copyMesh():
     try:
         object = Blender.Object.Get("Base")
         mesh = object.getData()
     except:
         return
     return mesh

def resetMesh(allData):
     try:
         object = Blender.Object.Get("Base")
         mesh = object.getData()
     except:
         return
     mesh = allData
     mesh.update(1)
---------------------------------------------------


With usage like:

a = copyMesh()

def rot():
     resetMesh(a)
     rotations...







> Mmm, what about inserting a meshkey first to save the original positions, then
> going back to it at the end?  We still have work to do with meshkeys, but
> maybe that can already help you.  It does a fast copy in C of the blender mesh
> coordinates.  After mesh.update() you might then remove meshkeys, both methods
> are in NMesh.

OK, I'll try. However I'm more sure if I can manipulate directly the 
verts, for some reasons...


> 
> It's important to make basic operations faster, specially with the support for
> bigger meshes that Blender got in recent versions, so please keep up with this
> discussion till we find what needs to be done.

OK, thanks!!!

         Manuel