[x3d-public] Mantis 1410: HAnimHumanoid skin definitions have no way to assign textures
Brutzman, Donald (Don) (CIV)
brutzman at nps.edu
Mon Dec 5 11:44:46 PST 2022
John, the mantis issue includes two examples already.
A. The first by Joe uses "skin" field with a Shape (illegal according to spec), rather than geometry node only (as specified by X3D spec). That is why his example is able to use textures, and that approach seems appropriate for X3D4.
B. The second Korean-student example uses "skeleton" field with descendant HAnimSegment nodes containing Shape geometry. That is a different approach, long valid, with similar visual effects as "skin" geometry.
If you have another example that you want to propose for X3D Example archives, we are always happy to review and consider together on mailing list. Thanks for your scrutiny and development efforts.
all the best, Don
--
Don Brutzman Naval Postgraduate School, Code USW/Br brutzman at nps.edu
Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149
X3D graphics, virtual worlds, Navy robotics https://faculty.nps.edu/brutzman
________________________________
From: John Carlson <yottzumm at gmail.com>
Sent: Monday, December 5, 2022 11:25:03 AM
To: Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
Cc: X3D Public Mailing List (x3d-public at web3d.org) <x3d-public at web3d.org>; h-anim at web3d.org <h-anim at web3d.org>
Subject: Re: [x3d-public] Mantis 1410: HAnimHumanoid skin definitions have no way to assign textures
NPS WARNING: *external sender* verify before acting.
Don, my comment was more about examples in HAnim 2 Standard Annex. If one wants to put an example with skin in the HAnim 2 annexes, that would be great. You have identified a problem with the body of the standard, I have identified a problem with annex.
I do not know a way to handle cases where there is an unmentioned field. I haven’t checked Joe Kick yet.
But yeah, conscientious attitudes are welcome too. We’re playing the long game. I feel very bad about not being able to read everything.
A skin field is welcome! I will add to Mantis.
CFE?
John
On Mon, Dec 5, 2022 at 12:08 AM Brutzman, Donald (Don) (CIV) <brutzman at nps.edu<mailto:brutzman at nps.edu>> wrote:
Hi John. We use Mantis for tracking possible issues in the specifications.
The problem in the X3D4 specification appears to be that there is no way to assign textures to skin geometry.
The Mantis issue (copied into this email) also proposes a solution that fixes the problem.
all the best, Don
--
Don Brutzman Naval Postgraduate School, Code USW/Br brutzman at nps.edu<mailto:brutzman at nps.edu>
Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149
X3D graphics, virtual worlds, Navy robotics https:// faculty.nps.edu/brutzman<http://faculty.nps.edu/brutzman>
From: John Carlson <yottzumm at gmail.com<mailto:yottzumm at gmail.com>>
Sent: Sunday, December 4, 2022 9:37 PM
To: Brutzman, Donald (Don) (CIV) <brutzman at nps.edu<mailto:brutzman at nps.edu>>
Cc: X3D Public Mailing List (x3d-public at web3d.org<mailto:x3d-public at web3d.org>) <x3d-public at web3d.org<mailto:x3d-public at web3d.org>>; h-anim at web3d.org<mailto:h-anim at web3d.org>
Subject: Re: [x3d-public] Mantis 1410: HAnimHumanoid skin definitions have no way to assign textures
There is no derivation that i see.
On Sun, Dec 4, 2022 at 11:33 PM John Carlson <yottzumm at gmail.com<mailto:yottzumm at gmail.com>> wrote:
Don, I did notice that there were no skins on an HAnim Motion 2 example. I will check the repository again tomorrow.
Is Joe Kick ok?
Do HAnim nodes derive from some Shape type?
John
On Sun, Dec 4, 2022 at 6:14 PM Brutzman, Donald (Don) (CIV) <brutzman at nps.edu<mailto:brutzman at nps.edu>> wrote:
Joe and I were working with various HAnim models today (using X3D-Edit!) and found an important problem.no<https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fproblem.no%2F&data=05%7C01%7Cbrutzman%40nps.edu%7C6c5c6822e4d04c6927b408dad6f670f1%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C638058651195496943%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=gLQE6TWzlpmxxlJhg3ty39uHP9YeLuwaR5x%2Bfqs0WV0%3D&reserved=0>
* Mantis 1410: HAnimHumanoid skin definitions have no way to assign textures
* https://www.web3d.org/member-only/mantis/view.php?id=1410
HAnimHAnimHumanoid skin definitions have no way to assign textures because Shape nodes are not currently allowed in the X3D4 parent-child node hierarchy.
* X3D4 Architecture, HAnim component, 26.3.2 HAnimHumanoid
* https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-DIS/Part01/components/hanim.html#HAnimHumanoid
Relevant field is
MFNode [in,out] skin [] [IndexedFaceSet, IndexedFanSet, IndexedQuadSet, IndexedTriangleSet, IndexedTriangleStripSet]
It is possible to assign color values, through use of Color or ColorRGBA nodes within IndexedFaceSet, for example. However, because Shape is not permitted, there is no way to assign corresponding Appearance with either Material or ImageTexture.
The following example shows animated skin with a texture, playable in X_ITE (and X3DOM and BSContact) players.
* X3D Example Archives: Humanoid Animation, Characters, Joe Kick
* https://www.web3d.org/x3d/content/examples/HumanoidAnimation/Characters/JoeKickIndex.html
Excerpt:
<Shape DEF='Joe_Shape' containerField='skin'>
<Appearance DEF='Joe_skin_Appearance'>
<Material DEF='Joe_skin_Material' diffuseColor='0.3 0.3 0.6' emissiveColor='0.3 0.3 0.6'/>
<ImageTexture DEF='JoeSkinImageTexture'
url=' "JoeBodyTexture29.png" "https://www.web3d.org/x3d/content/examples/HumanoidAnimation/Characters/JoeBodyTexture29.png"<https://www.web3d.org/x3d/content/examples/HumanoidAnimation/Characters/JoeBodyTexture29.png%22> '/>
<!-- ROUTE information for KickTextureTransform node: [from SkinInterpolator.value_changed to rotation ] -->
<TextureTransform DEF='KickTextureTransform'/>
</Appearance>
<IndexedFaceSet DEF='Joe_skin_IndexedFaceSet' etc.
<Coordinate DEF='Joe_SkinCoord' point= etc.
<TextureCoordinate point='0 0 0.5 0.5 0.5 0 0 0.5'/>
</IndexedFaceSet>
</Shape>
HAnim specification says
* HAnim specification version 2 volume 1, 6 Object interfaces, 6.2 Humanoid
* https://www.web3d.org/documents/specifications/19774/V2.0/Architecture/ObjectInterfaces.html#Humanoid
sequence<Object> skin [] [indexed mesh objects as defined by the representation]
An example “representation" for HAnim is X3D.
Possible fix:
a. Allow Shape node, in addition to IndexedFaceSet etc. (Matching Joe's example)
b. Note in the X3D4 specification prose that such a Shape node must contain one of those same nodes (IFS, ITS etc.). That will allow identical geometry capabilities that are currently clearly defined.
Note that the animated Korean characters did not display such a problem because they are apparently textures are part of HAnimSegment that is animated, which is part of skeleton field hierarchy, and not part of skin field. For example,
* X3D Example Archives: Humanoid Animation, Characters, Jin LOA 4
* Articulated 3D game character designed with a general graphics tool, then converted into an X3D HAnim model.
* https://www.web3d.org/x3d/content/examples/HumanoidAnimation/Characters/JinLOA4Index.html
We recommend
* Taking a generous view of HAnim2 wording “[indexed mesh objects as defined by the representation]”
* to allow identical usage of a Shape node, thus ensuring that textures are possible on animated human skin.
* Such an approach is already demonstrated in our examples, so it is feasible and expected.
Sincerely yours, Joe and Don.
all the best, Don
--
Don Brutzman Naval Postgraduate School, Code USW/Br brutzman at nps.edu<mailto:brutzman at nps.edu>
Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149
X3D graphics, virtual worlds, Navy robotics https:// faculty.nps.edu/brutzman<http://faculty.nps.edu/brutzman>
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