[x3d-public] Transforms -> HAnimJoints

[John Carlson]

Yeah, I was trying to write quaternions on shoulder stuff to get from A
Pose to I Pose.

If you have a good test suite, please share.  One thing that I found out
was you're supposed to multiply on the left of center by the quaternion and
on the right by the inverse quaternion???  Online documentation goes all
over the board.  I'm thinking of resorting to THREE.js. Maybe The C/C++/C#
SAI has something?


Thanks,

John

On Fri, Aug 25, 2023 at 1:36 PM GPU Group <gpugroup at gmail.com> wrote:

> John, that's great we'll need you.
> I haven't worked on the blender exporter in weeks, you are welcome to
> start that HAnim export part if you like.
> https://github.com/dug9/BlenderX3DSupport
> Right now I'm struggling to load .bvh files at random with bvhacker
> https://github.com/DaveDubUK/bvhacker as a cleaning tool.  There are lots
> of recorded bvh motion files to download and use. But even bvhacker needs
> work -- for example ensuring  Y-UP (blender exports .bvh Z-UP), mapping to
> HAnim LOA names/selecting the right LOA, ARMS_DOWN default pose.
> For example when using a T-pose .bvh file (the T geometry is recorded in
> the OFFSETs field and angles are relative to that pose) on an ARMS_DOWN
> HAnim, the shoulder/arm rotations aren't correct. BVHacker does some
> channel swapping X--Y, but similar technique in freewrl doesn't work
> reliably (yet).
> SUMMARY: I'm in the same zone with the hanim transforms but stuck back a
> few steps in getting freewrl to play a .bvh with good shoulder animation.
> So stuck for a while but open to coordinating with you on HAnim and blender
> exporter.
> -Doug
>
> On Fri, Aug 25, 2023 at 12:21 PM John Carlson <yottzumm at gmail.com> wrote:
>
>> Doug,
>>
>> I have some code I've been working on that converts VRML Transforms
>> with DEFs to HAnimJoints.  Maybe we should collaborate on Hanim Blender
>> export. I'm also looking for something that will apply transforms to joint
>> centers, if you have something tested and separate from FreeWRL.
>>
>> Thanks,
>>
>> John
>>
>
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