[Bf-python] Fix for NMesh face sel

[Willian Padovani Germano]

joeedh wrote:

> Hi.  I've written a intrude tool in bpython!! I works just like in 
> Wings, except that you have to manually press ALT-S to move along normal.
> EXCEPT. . .there was a bug in NMesh where flags from the newly added 
> Face Select mode weren't being considered.  This patch fixes that.  I 
> need the flags to behave correctly to identify which faces are selected .

Hi Joe,

As you know, there are two face flags regulating selection and 
visibility state, etc: one for tfaces (face select mode in 3d view) and 
another for normal mfaces (visible in edit mode).  NMesh handled the 
tface ones with nmesh->flag, since that was the only thing available 
when it was written.  It's better not to mix them, because Blender 
doesn't keep tfaces and mfaces sel/hide states in sync, for ex. sel 
states are currently independent unless you enter editmode while in face 
select mode.

I added (current cvs) two new attributes to NMFace: sel and hide, to 
handle selection and visibility of mesh faces -- the ones we see in edit 
mode -- please try and tell me if this is enough.

It's simpler than nmesh->flag bitflag:

import Blender
from Blender import NMesh, Window

in_emode = Window.EditMode()
if in_emode: Window.EditMode(0)

nmesh = NMesh.GetRaw("Mesh")
faces = nmesh.faces
selected = []

for f in faces:
  if f.sel:
    selected.append(f)

print selected

# invert selection:
for f in faces:
  f.sel = 1 - f.sel

nmesh.update()
if in_emode: Window.EditMode(1)

Stephen: (about obj.getData(name_only = True) ... indeed it sounds 
better this way, I'll change it in my next commit, unless someone in a 
hurry does it first ; ).

-- 
Willian