[x3d-public] Extrusions, take 3

[Leonard Daly]

John,

In Maya and Blender extrusions are used all of the time in modeling. 
Once the extrusion is created, it is immediately converted to a quad 
mesh. Animations are done on the quad mesh. The quad mesh is what is 
saved and exported.

Leonard Daly




> Maybe just show an example of an IndexedFaceSet which is an extrusion 
> of a circle with 3 spline points, with the “bend” animated from 90 to 
> 180 degrees.
>
> It’s okay to use Blender or Maya, I’d just like to see what the 
> results look like.
>
> John
>> On Jan 26, 2016, at 8:01 PM, John Carlson <yottzumm at gmail.com 
>> <mailto:yottzumm at gmail.com>> wrote:
>>
>> So how do you propose to animate IndexedFaceSets in a declarative or 
>> VRMLscript or JavaScript manner if they are Extrusions?  Can we see 
>> an example?  If the developer has to do it, can we help them?
>>
>> John
>>> On Jan 26, 2016, at 6:58 PM, Leonard Daly <Leonard.Daly at realism.com 
>>> <mailto:Leonard.Daly at realism.com>> wrote:
>>>
>>> On 1/26/2016 3:21 PM, John Carlson wrote:
>>>> Leonard, I think you forget that Extrusion splines etc. can be 
>>>> animated.  If Maya can export an Extrusion animation to X3D V4.0 
>>>> and your new elements can handle animation of it, I think we are fine.
>>>
>>> In Maya and Blender, extrusions are converted to IndexedFaceSets. 
>>> These can be animated through the usual mechanisms in those 
>>> applications. The results are typically stored in a FBX file. 
>>> Unfortunately, the FBX format is not open and not too conducive to 
>>> importing in a browser. Autodesk provides a C++ and Python API for 
>>> accessing the file.
>>>
>>> Extrusions are just a convenience node for creating a constrained 
>>> IndexedFaceSet. I am working on exactly how X3D fits in the process 
>>> chain from modeling tools to display. The goal is that X3D is an 
>>> declarative archivable format that has a browser-based run time. The 
>>> goal is to not reduce the display capability of X3D in that chain; 
>>> however, not all of the functionality of X3D V3.3 is necessary to 
>>> remain in the node definitions to make that happen.
>>>
>>> Animation of the spline and cross-sections of an extrusion is much 
>>> easier for the developer, but puts a much greater load on the 
>>> run-time as it needs to re-triangulate the result on each animation.
>>>
>>>
>>> Leonard Daly
>>>
>>>
>>>
>>>
>>>
>>>>
>>>> John
>>>>> On Jan 26, 2016, at 1:47 PM, Leonard Daly 
>>>>> <Leonard.Daly at realism.com> wrote:
>>>>>
>>>>> I would like to ask the question very differently. My question is 
>>>>> not to ignore the importance of getting the definition correct for 
>>>>> X3D <= V3.3.
>>>>>
>>>>>
>>>>> Most (>95%) 3D modeling is done with a tool. In non-CAD 
>>>>> environment, the tools is almost certainly Maya or Blender. Both 
>>>>> of those tools have extrusions built in to their interface. I 
>>>>> imagine CAD tools are similar. With so many tools providing 
>>>>> graphical extrusion editors, and some of the tools being 
>>>>> open-source (at least Blender);
>>>>>
>>>>> Do we need an extrusion node in V4 to support content developed 
>>>>> for V4+?
>>>>>
>>>>>
>>>>> Leonard Daly
>>>>>
>>>>>
>>>>>
>>>>> On 1/26/2016 7:15 AM, Alekseyev, Vsevolod (NIH/NIAID) [E] wrote:
>>>>>> Hi X3D community,
>>>>>>
>>>>>> I've tried and failed twice to explain the problems with the 
>>>>>> definition of the Extrusion node. So here's a tl;dr version:
>>>>>>
>>>>>> Dear authors of the X3D standard, please take a careful look at 
>>>>>> the standard and answer me:
>>>>>>
>>>>>> 1) When the spine goes (0,0,0)-(0,-1,0), what is the CSP?
>>>>>> Note: all answers but one will render one of the reference models 
>>>>>> in the Savage archive invalid.
>>>>>>
>>>>>> 2) When the spine goes (0,0,0)-(0,1,0)-(0,0,0), what is the CSP?
>>>>>>
>>>>>> 3) When the spine goes (0,0,0)-(1,1,0)-(1,1,0)-(1,1,0)-(2,0,0), 
>>>>>> what is the CSP for the three middle points?
>>>>>>
>>>>>>
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>>>>>
>>>>>
>>>>> --
>>>>> *Leonard Daly*
>>>>> 3D Systems & Cloud Consultant
>>>>> X3D Co-Chair on Sabbatical
>>>>> LA ACM SIGGRAPH Chair
>>>>> President, Daly Realism -/Creating the Future/
>>>>> _______________________________________________
>>>>> x3d-public mailing list
>>>>> x3d-public at web3d.org <mailto:x3d-public at web3d.org>
>>>>> http://web3d.org/mailman/listinfo/x3d-public_web3d.org
>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>
>>>
>>> --
>>> *Leonard Daly*
>>> 3D Systems & Cloud Consultant
>>> X3D Co-Chair on Sabbatical
>>> LA ACM SIGGRAPH Chair
>>> President, Daly Realism -/Creating the Future/
>>> _______________________________________________
>>> x3d-public mailing list
>>> x3d-public at web3d.org <mailto:x3d-public at web3d.org>
>>> http://web3d.org/mailman/listinfo/x3d-public_web3d.org
>>
>


-- 
*Leonard Daly*
3D Systems & Cloud Consultant
X3D Co-Chair on Sabbatical
LA ACM SIGGRAPH Chair
President, Daly Realism - /Creating the Future/
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