[Bf-python] Python API refactoring wiki

[Ken Hughes]

jmsoler at free.fr wrote:
> Selon jmsoler at free.fr:
> 
> 
>>Selon Campbell Barton <cbarton at metavr.com>:
>>
>>
>>>Hey Guys, started a wiki page for python api refactoring.. check it out.
>>>http://mediawiki.blender.org/index.php/BlenderDev/BpyApiDiscussion
>>>
>>
>>About this :
>>" Will we maintain NMesh? (seems like a good time to get rid of it)",
>>just a word, create a simple vertex with Mesh is 60/70 times slower
>>than with NMesh .
> 
> 
> Comparison script :
> http://jmsoler.free.fr/didacticiel/blender/tutor/cpl_MeshvsNMesh.htm

OK, that's understandable; appending vertices/edges/faces one at a time 
is extrememly inefficient.  Each time extend() is called, the a new 
structure has to be alloced, the existing data copied, and the new vert 
appended to the end.

For adding new verts/edges/faces, the intent is to put all the items 
into sequence, then call extend():

for i in range(LIM):

verts=[]
for i in range(LIM):
   verts.append((Noise.random()*DIM,
	Noise.random()*DIM,Noise.random()*DIM))
me.verts.extend(verts)

Written this way, my timings show Mesh to be about 20% faster than NMesh.

Ken