[x3d-public] Deformable Skin Animation

[Joe D Williams]

Hi Leonard, ,
Sounds like you have the maths, but also take a look at the Boxman 
example in the HAnim archives.
That basically could serve as an unofficial prototype for the 
hanim-style joint-based continious mesh animations.
It shows a script to do deformable skin using joints as the actuators. 
That example is also interesting because it shows how to produce a 
continious mesh from a set of individual geometries.

For an slighty bigger hanim example that runs in BSContact and several 
others, the attached example shows deformable skin based on weighted 
joint(s) animation for the LOA3.

Thanks,
Joe

* I know people may be getting tired of this one, but notice I just 
added some fingerworks on the right hand, to demo the right-hand rule 
and show that if you keep track of your axes, z rotation is always 
gonna be roll.

<OrientationInterpolator DEF='r_index0RotInterp'
key='0,0.5,0.75,1'  keyValue='0 0 1 0,0 0 1 0,0 0 2.9 1,0 0 1 
0'></OrientationInterpolator>
<OrientationInterpolator DEF='r_index1RotInterp'
key='0,0.5,0.75,1'  keyValue='0 0 1 0,0 0 1 0,0 0 5.9 1.5,0 0 1 
0'></OrientationInterpolator>
<OrientationInterpolator DEF='r_index2RotInterp'
key='0,0.5,0.75,1'  keyValue='0 0 1 0,0 0 1 0,0 0 5.9 1.5,0 0 1 
0'></OrientationInterpolator>
<OrientationInterpolator DEF='r_index3RotInterp'
key='0,0.5,0.75,1'  keyValue='0 0 1 0,0 0 1 0,0 0 6.1 1.5,0 0 1 
0'></OrientationInterpolator>




----- Original Message ----- 
From: "Leonard Daly" <Leonard.Daly at realism.com>
To: "X3D Public" <x3d-public at web3d.org>
Sent: Friday, November 11, 2016 9:53 AM
Subject: [x3d-public] Deformable Skin Animation


>I am trying to construct an example of deformable skin based on joint
> animation. The example calculates the new vertices for a very simple
> (and small) object. To work slowly through the process, I started 
> the
> work in BS Contact. The calculation involves some matrix 
> calculations.
> These appear to not be available in BS Contact's Script node. I have
> found problems with
>
>  * X3DMatrix4
>  * X3DMatrix4.setTransform
>  * X3DMatrix4.multMatrixVec
>
> This is the first time I have tried anything like this -- so I very 
> well
> may be doing this wrong. If anyone has any references or examples 
> where
> they did calculations with 4x4 matrices in BS Contact, please let me 
> know.
>
> So far, I have unrolled the calculations and am advancing (aka
> debugging) the algorithm. I will soon move it into X3DOM.
>
>
> -- 
> *Leonard Daly*
> 3D Systems & Cloud Consultant
> LA ACM SIGGRAPH Chair
> President, Daly Realism - /Creating the Future/
>


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