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

John Carlson yottzumm at gmail.com
Sat Oct 14 00:29:37 PDT 2023


Apparently, Euler angles can also be in radians.  Sigh!

On Sat, Oct 14, 2023 at 2:09 AM John Carlson <yottzumm at gmail.com> wrote:

> Unity say Euler angles are in degrees.  Does that answer the HAnimMotion
> question?
>
> Are euler angles always in degrees?
>
> John
>
>
> On Sat, Oct 14, 2023 at 1:57 AM John Carlson <yottzumm at gmail.com> wrote:
>
>> Angles are angles.  Euler is not a unit.
>>
>> I don’t disagree with converting to axis angle, but I would prefer if the
>> browser vendor would handle that in the HAnimMotion code.
>>
>> I realize that HAnimMotion is a high component level.  I’m trying to
>> promote use of HAnimMotion because I’m trying to export Katy’s data.  If
>> Katy or you have a better way to export animations, let’s use it.
>>
>> 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
>>>>
>>>>
>>>>
>>>
>>>
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://web3d.org/pipermail/x3d-public_web3d.org/attachments/20231014/d3446908/attachment.html>


More information about the x3d-public mailing list