How to select the tip, body or root of a bone.

Coding Python Support
#1

I am using blender 2.56, which uses Python 3.1, and am working on a script
to build a skeleton. Problem I have is that after I switch the direction
of an armature, I then try to do an extrude, but the extrude occurs at
BOTH ends of the armature. So I need a way to select the tip, root, or
body of the armature . . .

bpy.ops.object.armature_add()
bpy.data.objects[“Armature”].location.z = 7.7 #8.6
bpy.ops.object.editmode_toggle()
bpy.ops.armature.extrude()
bpy.ops.transform.translate(value=(0.0, 0.1, 0.92))
bpy.ops.armature.select_hierarchy()
bpy.ops.armature.select_hierarchy()
bpy.ops.armature.switch_direction()
bpy.ops.armature.extrude(forked=False)
bpy.ops.transform.translate(value=(1.0, 0.0, 0.0))
bpy.ops.armature.extrude(forked=False)

When I try to do this:
>>>bpy.data.armatures[“Armature”].bones[“Bone.003”].select_tail=True
>>>bpy.data.armatures[“Armature”].bones[“Bone.003”].select_head=False

If will not work. I have tried many other ideas, but am not able to find a way
to select the tip, head or tail of the bone. As best I can tell, the functionality
as listed in the previous two lines of code just does not exist, or I am just
using the wrong syntax.

“Time is the fire in which we burn.” Gene Roddenberry

#2

wrong counting Bone.003 does not exist! Bone Bone.000 Bone.001 Bone.002

But nevertheless the select_* = True seams not to be done … so question remains :wink:

By the way, the Info-panesl does not show ani API command if one selects any bone in edit mode,
(or in pose mode)

Though the commands are not rejected … (but visible if afterwards printed) but no effect in the 3dView

#3

The Bone.003 was just an example, so trying it on bone.000 has the same results, which is in fact no results. My goal is only to make sure that when I do extrude, I only get one extrusion, not two. If I can select the tip or root, I should be able to accomplish that.

#4

Setting True does not complain, thus try and see the extrude :wink: ?!

#5

I’d like to know the answer to this too.

I can select between bones with
bpy.ops.armature.select_hierarchy(direction=‘CHILD’) # or ‘PARENT’

but can’t get the tips selected by any command i’ve found.

kesten

#6

When I try to do this:
>>>bpy.data.armatures[“Armature”].bones[“Bone.003”].select_tail=True
>>>bpy.data.armatures[“Armature”].bones[“Bone.003”].select_head=False

It will not work.

of course it won’t, you try to access the wrong data structure. You gotta use edit_bones[“Bone.003”].select_tail=True etc. in edit mode