[Bf-python] Issue with obtaining children of an armature bone

[Gilbert, Joseph T.]

The bone.children attribute returns ALL the children under that bone. I
guess it could just return the immediate children..... 

-----Original Message-----
From: bf-python-bounces at projects.blender.org
[mailto:bf-python-bounces at projects.blender.org] On Behalf Of Tron Thomas
Sent: Tuesday, December 20, 2005 3:43 PM
To: bf-python at projects.blender.org
Subject: [Bf-python] Issue with obtaining children of an armature bone

I am interested in writing a Python Blender exporter to export skeletal 
animation information.  I have been using the latest development code 
base to become familiar with the new implementation that will be 
available for the armature, bones, etc.

I was working with code I synched up with on Monday, December 19th, and 
I was trying to export an armature in rest position.  Getting this type 
of information is vastly improved over what existed in last release of 
Blender.  Despite the improvements, I ran across a serious problem that 
prevented the export from working successfully.

I discovered that when I try to obtain the children for a particular 
bone, instead of getting only the immediate children, I get all 
descendants from that bone, and I had no way to know how all these 
descendants were hierarchically related.  I did some investigate into 
the code base.  I discovered that if I removed the last if statement 
inside the for loop of the PyBone_ChildrenAsList function contained in 
Bone.c, I was able to successfully export the skeletal information.

I'm wondering whether the existence of this particular if statement is a

bug in the code.  I don't know if removing the statement breaks anything

or why it was added to the function.

It seems that the children attribute of a bone is intended to only 
return the immediate children of that bone.  How correct is this 
assumption?  If the children attribute is intended to provide all bone 
descendants, how can someone determine the hierarchical relation of 
bones in the armature?


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