[x3d-public] Blender importer plans (attach geometry to bone)

[John Carlson]

Sorry for all the posts, this seems relevant:

https://blender.stackexchange.com/questions/31017/parent-an-object-to-a-bone-in-python

That’s not quite what I was looking for.  I’m actually looking for how to
attach a child transform (site or segment) to a bone, and then attach a
shape to a transform (there’s probably code for the latter in the importer).

On Fri, Dec 29, 2023 at 9:11 PM John Carlson <yottzumm at gmail.com> wrote:

> Here’s how to add weights to bones (joints) in blender:
>
>
> https://blender.stackexchange.com/questions/24170/how-to-assign-vertex-groups-and-bone-weights-through-blenders-python-api
>
> I can’t find anything obvious about adding sites and segments (transforms)
> to joints (bones) on Blender import with the Blender Python API.
>
> Hmm!
>
>
> On Fri, Dec 29, 2023 at 8:13 PM John Carlson <yottzumm at gmail.com> wrote:
>
>> Here’s some example code for HAnim joints to Blender bones which could be
>> generalized for Blender import:
>>
>>
>> https://github.com/coderextreme/X3DJSONLD/blob/master/blend/blenderskeleton.py
>>
>> One could add HAnim sites, segments and weights.  I can “export” these
>> things, but I have no experience with Blender import. Sites and segments
>> can translate to transforms(?), but weights are kind of mysterious, and
>> will require some searching online.
>>
>> I do not currently know how to attach anything to bones, but bones
>> themselves.
>>
>> John
>>
>> On Fri, Dec 29, 2023 at 7:53 PM John Carlson <yottzumm at gmail.com> wrote:
>>
>>> There’s a very good “mapping” from X3D to Blender here:
>>>
>>>
>>> https://github.com/Web3DConsortium/BlenderX3DSupport/blob/main/io_scene_x3d/import_x3d.py
>>>
>>> Starting at line 1487.
>>>
>>> I suggest we use this code going forward for any Blender X3D importer.
>>>
>>> The JSON conversion to nodes call can be added around line 3526.
>>>
>>> There seem to be 2 tasks:
>>>
>>> 1. Converting JSON to nodes, like what is done for XML and WRL.
>>>
>>> 2.  Converting HAnim to appropriate Blender structures (bones and named
>>> transforms)
>>>
>>> Probably I would be best qualified for JSON processing and Doug could
>>> work on the second task?  Anyone else want to volunteer?
>>>
>>> Could we leverage the io_scene_x3dv addon for JSON?
>>>
>>> Thanks!
>>>
>>> John
>>>
>>>
>>> On Fri, Dec 29, 2023 at 6:46 PM John Carlson <yottzumm at gmail.com> wrote:
>>>
>>>> Here are my current plans for HAnim import into Blender.
>>>>
>>>> 1. Upgrade current WRL and X3D importer to current HAnim standards.
>>>> Convert joints to bones and sites and segments to transforms, include
>>>> geometry attached to skeleton, sites and segments.  Convert
>>>> OrientationInterpolators to keyframe animation.
>>>>
>>>> 2.  Possible JSON to DOM conversion in Python.
>>>>
>>>> 3.  I don’t have current plans to use x3d.py due to difficulty to read
>>>> in various encodings.  Help would be appreciated.
>>>>
>>>> John
>>>>
>>>
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