Fwd: Fwd: Re: License of flipcode snippet for polygon triangulation

For the record, this is the e-mail discussion with the author of the 
polygon triangulation code snippet used in the use case: "Incorporating 
geospatial data (e.g. geo-referenced geometry) into interactive 3D 
graphics on the Web" [1].

This makes it clear that the code is public domain. All other code in 
those examples are either public domain or under the MIT licence. All 
relevant licence information is included.

[1] 
http://www.w3.org/TR/2015/NOTE-sdw-ucr-20151217/#IncorporatingGeospatialDataIntoInteractive3DGraphicsOnTheWeb


-------- Forwarded Message --------
Subject: Fwd: Re: License of flipcode snippet for polygon triangulation
Date: Thu, 10 Dec 2015 16:32:09 +0100
From: Stefan Lemme <stefan.lemme@dfki.de>
To: Phil Archer <phila@w3.org>


Just in case you actually need the "written statement".

Best,
Stefan


-------- Forwarded Message --------
Subject:  Re: License of flipcode snippet for polygon triangulation
Date:  Thu, 10 Dec 2015 07:47:12 -0600
From:  John Ratcliff <jratcliffscarab@gmail.com>
To:  Stefan Lemme <stefan.lemme@dfki.de>



It is public domain.

On Dec 10, 2015 2:42 AM, "Stefan Lemme" <stefan.lemme@dfki.de
<mailto:stefan.lemme@dfki.de>> wrote:


     Hi John,

     thanks for prompt response and the quick action.

     Indeed, your code snippet is somewhat predominant when searching for
     polygon triangulation.
     Even if you find an alternative implementation, it usually refers to
     the snippet at flipcode.

     Thus, can you please clarify the terms under which we can use this
     snippet (i.e. the ported version to XML3D/Xflow).

     Unfortunately, the snippet at flipcode states no license and the
     general terms are pretty restrictive.
     Another source of the same/similar implementation from you stating a
     license would be fine as well.

     Best,
     Stefan



     On 12/9/2015 6:02 PM, John Ratcliff wrote:
>     I looked at the source, and I think the origin of the algorithm is
>     probably from a Graphics Gems book or something.  I think it's
>     fairly standard stuff.
>
>     I keep searching the internet but all I can find is references to
>     my own code; not the original version I referenced.  Actually, as
>     I search Google it's kind of amazing how many places this snippet
>     of code ended up over the years.  Pretty wild.
>
>     It might be based on this, but I looked at the source code and it
>     doesn't seem super similar.
>
>     http://www.cs.unc.edu/~dm/CODE/GEM/chapter.html
>     <http://www.cs.unc.edu/%7Edm/CODE/GEM/chapter.html>
>
>     Sorry, I just can't remember it has been so long.
>
>
>
>     On Wed, Dec 9, 2015 at 9:09 AM, Stefan Lemme <stefan.lemme@dfki.de
>     <mailto:stefan.lemme@dfki.de>> wrote:
>
>
>         Dear John,
>
>         since the mail below bounced, I'll give it a try with your
>         gmail address.
>
>         Best,
>         Stefan
>
>
>         -------- Forwarded Message --------
>
>         Dear John,
>
>         we ported your code for polygon triangulation from
>
>             http://www.flipcode.com/archives/Efficient_Polygon_Triangulation.shtml
>
>         into an Xflow operator to be used with XML3D
>         (http://xml3d.org/) as shown at
>
>             https://github.com/stlemme/3d-map-tiles/blob/stable/operators/extrudePolygon.js
>
>         and put a respective attribution in place.
>         We are using it in a research project to perform basic
>         extrusion of polygons from OpenStreetMap data.
>         An example is available at
>
>             http://stlemme.github.io/poi-client/single-tile-brussels.html
>
>         However, while reviewing the code, we stumbled on this
>         reference to flipcode.
>
>         May I ask you to indicate the origin of the algorithm/source
>         code (as stated it's from somewhere) and the license to be
>         applied to your flipcode snippet?
>
>         Thanks in advance.
>
>         Best regards,
>         Stefan
>
>
>         ---
>
>         ********************************************************
>         Stefan Lemme
>
>         DFKI GmbH
>         Agents and Simulated Reality
>         Campus, Build. D 3 4, room 0.75
>         D-66123 Saarbruecken
>         Germany
>
>         Phone: +49 (0) 681 / 85775 – 5391
>         <tel:%2B49%20%280%29%20681%20%2F%2085775%20%E2%80%93%205391>
>         Fax: +49 (0) 681 / 85775 – 2235
>         <tel:%2B49%20%280%29%20681%20%2F%2085775%20%E2%80%93%202235>
>         http://www.dfki.de/web
>         ********************************************************
>         German Research Center for Artificial Intelligence
>         Deutsches Forschungszentrum fuer Kuenstliche Intelligenz GmbH
>         Trippstadter Strasse 122, D-67663 Kaiserslautern, Germany
>
>         Management Board:
>         Prof. Dr. Dr. h.c. mult. Wolfgang Wahlster (Chairman)
>         Dr. Walter Olthoff
>
>         Chairman of the Supervisory Board:
>         Prof. Dr. h.c. Hans A. Aukes
>
>         Amtsgericht Kaiserslautern, HRB 2313
>         ********************************************************
>
>
>
>

Received on Thursday, 10 December 2015 16:43:03 UTC