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<div class="moz-cite-prefix">Thank you Michalis and Mike. I have
incorporated your comments into the post by expanding the top
section and highlighting that the comparison just reflects the
specifications and the X3D Interchange profile. I also added more
explanation for the choice of comparison factors.<br>
<br>
The request was not explicitly for the Interchange Profile, but
why/how someone would choose between these two formats. Since
higher level X3D Profiles include a lot of run time and glTF does
not include any, it would not be a fair comparison -- it wouldn't
even be relevant. Someone might need to work in a specific
environment which would preclude X3D's runtime. <br>
<br>
A lot depends on what a developer needs to do. For example, if the
developer is someone at Autodesk that works on Maya, the
modeling/texturing/animation capabilities are critical. A required
run-time is a hindrance. A developer at a web company wants to
know how well things will work in a DOM-integrated browser
environment. X3D (as described in the spec) cannot be considered
because it is not DOM-integrated. If the developer is building a
stand-along environment, then glTF can only address the modeling
part as it does not have a run-time. <br>
<br>
<br>
Leonard Daly<br>
<br>
<br>
<br>
On 9/21/2017 7:26 AM, Michael Aratow wrote:<br>
</div>
<blockquote type="cite"
cite="mid:7f345f06-cafb-4aaf-9be2-42ea299359cb@noegenesis.com">Thanks
Michalis! I am one of those readers, since I didn't read the fine
print or Leonard's explanatory sentence appropriately!
<br>
<br>
I wonder why the request was just for interchange profile?
Wouldn't a true comparison be of all the features supported by the
complete spec of each? That's what I would think a developer
would be wanting to know.
<br>
<br>
<br>
On 9/21/17 5:32 AM, Michalis Kamburelis wrote:
<br>
<blockquote type="cite">2017-09-20 16:14 GMT+02:00 Leonard Daly
<a class="moz-txt-link-rfc2396E" href="mailto:Leonard.Daly@realism.com"><Leonard.Daly@realism.com></a>:
<br>
<blockquote type="cite">In response to a request, I wrote an
article comparing features of glTF to
<br>
X3D Interchange Profile. Most of the comparisons include links
to illustrate
<br>
the capabilities. The article is online at
<br>
<a class="moz-txt-link-freetext" href="http://realism.com/blog/gltf-x3d-comparison">http://realism.com/blog/gltf-x3d-comparison</a>. It includes
comparison to
<br>
features and capabilities of both and a few items showing the
extent of
<br>
support in other packages.
<br>
</blockquote>
Thank you. That is very informative.
<br>
<br>
The only thing I would complain is that some readers may not
realize
<br>
that this is only talking about X3D in Interchange profile. Some
<br>
features ("Quad surface model", "Mesh skin", "Custom Shaders",
"Joint
<br>
animation") are actually available in X3D, just not in the
<br>
"Interchange" profile. I know, you mention this in the footnotes
--
<br>
I'm just afraid that some readers will not read the footnotes,
and
<br>
think "oh, X3D doesn't support this-and-that while glTF does".
Just
<br>
like not all X3D browsers implement the additional components
beyond
<br>
Interchange, but also not all glTF readers implement all
features of
<br>
glTF format, so the *practical* difference between these two
formats
<br>
is more even in my experience.
<br>
<br>
P.S. "Custom shaders" in glTF: work is in progress on
<br>
<a class="moz-txt-link-freetext" href="https://github.com/KhronosGroup/glTF/tree/master/extensions/Khronos/KHR_technique_webgl">https://github.com/KhronosGroup/glTF/tree/master/extensions/Khronos/KHR_technique_webgl</a>
<br>
. Indeed, this is not finished (and it's an extension, not part
of
<br>
"core" format spec).
<br>
<br>
Regards,
<br>
Michalis
<br>
<br>
_______________________________________________
<br>
x3d-public mailing list
<br>
<a class="moz-txt-link-abbreviated" href="mailto:x3d-public@web3d.org">x3d-public@web3d.org</a>
<br>
<a class="moz-txt-link-freetext" href="http://web3d.org/mailman/listinfo/x3d-public_web3d.org">http://web3d.org/mailman/listinfo/x3d-public_web3d.org</a>
<br>
<br>
<br>
</blockquote>
<br>
<br>
</blockquote>
<p><br>
</p>
<div class="moz-signature">-- <br>
<font class="tahoma,arial,helvetica san serif" color="#333366">
<font size="+1"><b>Leonard Daly</b></font><br>
3D Systems & Cloud Consultant<br>
LA ACM SIGGRAPH Chair<br>
President, Daly Realism - <i>Creating the Future</i>
</font></div>
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