[x3d-public] Units for BVH vs HAnimMotion.values

[John Carlson]

Here's the Euler Angle to Axis-Angle in HAnim Pt section 5.2.4

https://www.web3d.org/documents/specifications/19774/V2.0/MotionDataAnimation/AnimationUsingInterpolators.html#AngleConversionProcedure

Hmm!  I'm guessing that Blender has a routine for this! Sure enough!
Trying it now.

Not with HAnimMotion, I don't know how to do that yet.  Suggestions?

John

On Sat, Oct 14, 2023 at 12:21 AM Joe D Williams <joedwil at earthlink.net>
wrote:

> > Um, then why is angle even listed here?
>
>
>
> That is easy, take another look.
>
> Euler angles are not listed anywhere!
>
> Convert to axis-angle like showed in Part 2 and forget xyz angles/
>
> Joe
>
>
>
>
>
> -----Original Message-----
> From: John Carlson <yottzumm at gmail.com>
> Sent: Oct 13, 2023 6:15 PM
> To: Joe D Williams <joedwil at earthlink.net>
> Cc: <x3d-public at web3d.org>
> Subject: Re: [x3d-public] Units for BVH vs HAnimMotion.values
>
>
> Um, then why is angle even listed here?
>
> Confusing as heck!
>
>
> https://www.web3d.org/documents/specifications/19775-1/V4.0/Part01/concepts.html#t-Standardunits
>
> John
>
>
> On Fri, Oct 13, 2023 at 7:19 PM Joe D Williams <joedwil at earthlink.net>
> wrote:
>
>> > otherwise specified in a UNIT statement
>>
>>
>>
>>
>> https://www.web3d.org/documents/specifications/19775-1/V4.0/Part01/concepts.html#Standardunitscoordinates
>>
>>
>>
>> "However, the world coordinate units may be modified by specifying a
>> different length unit using the UNIT statement."
>>
>>
>>
>> There is Not Now nor will there Ever be a UNIT statement that allows
>> degrees for rotation and orientation.
>>
>>
>>
>> Never, will angles appear in any x3d animation interpolator.
>>
>> To apply an import using angle units, it is converted to x3d before use,
>> then discarded or possibly stored somewhere away from working area for
>> reference.
>>
>>
>>
>> Thanks and Best,
>>
>> Joe
>>
>>
>>
>> -----Original Message-----
>> From: John Carlson <yottzumm at gmail.com>
>> Sent: Oct 13, 2023 11:44 AM
>> To: X3D Graphics public mailing list <x3d-public at web3d.org>
>> Subject: [x3d-public] Units for BVH vs HAnimMotion.values
>>
>>
>> Apparently BVH uses degrees for rotations.  Units for HAnimMotion should
>> use radians unless otherwise specified in a UNIT statement, AFAIK.
>>
>> Comments?
>>
>> Thanks!
>>
>> John
>>
>>
>>
>
>
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