[X3D-Ecosystem] Classical way of attaching object to a Blender bone

[John Carlson]

Blender python to attach an object to armature and bone.

import bpy

# Get the object and armature
obj = bpy.context.object
armature = bpy.data.armatures["ArmatureName"]
# Get the bone to parent to
bone = armature.bones["BoneName"]
# Set the parent
obj.parent = armature
obj.parent_type = 'BONE'
obj.parent_bone = bone.name



Note that the object’s parent is the armature, not the bone.

It’s possible I used bone instead of bone.name.

The XML nodes are traversed in order, typically.

No one says if it’s possible to set child objects of objects to  the
armature as a parent . I don’t know if there’s a hierarchy of objects under
the armature or not.  Typically, I’m traversing a hierarchy of children,
and I will have to know if the whether the parent is a bone or not.  If the
parent is a bone, then i do the above.

Should I attach objects of nodes below obj’s XML node to the armature
parent or obj?

How do I tell if I should attach to armature or obj for grandchildren?

Realize that i will be attaching empty objects, there’s no equivalent for
site or segment in blender.  This will mean that I will probably have a
hierarchy of bones and a hierarchy of objects (sites, segments, transforms
(as empty objects) and geometry).  I am not prepared for this algorithm on
export, where a bone hierarchy is “separate” from the object hierarchy with
no known way of getting bone children, except other bones.  That’s a huge
problem I will have. To test for bone parents for each object (say under
armature) and insert a joint above the armature children.  Then, I won’t
even know if they are Transforms, HAnimSites or HAnimSegments, because
there’s only adhoc ways of determining x3d node type from empty objects
(naming, custom properties).  If it’s a foreign import, how do I render
it’s object hierarchy under armature as X3D?  I can’t put Transforms under
HAnimJoints!

If I’m adding joint objects, should I add both bones and objects?

Realize none if this armature or bone stuff was in the exporter before and
I’ve been adding it in addition to animations that need to work.

I think the best I can hope for is a flat bone hierarchy.  Maybe that’s
what I’ll do.

John
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