[x3d-public] Extrusions, take 3

[John Carlson]

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> 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 < <mailto:Leonard.Daly at realism.com>Leonard.Daly at realism.com <mailto: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
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>> 
>> 
>> 
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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
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