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gary ruben wrote:
> True, I didn't pay much attention to licencing. In light of it though, here
> are a couple more links to a couple of gentlemen who may be worth
> grovelling to should the need arise. No specific licencing is mentioned.
> 
> <http://mahi.ucsd.edu/parker/Software/>
Actually, having seen this code and the gist code, I'd recommend waiting 
 for the gist-derived prototype.
To muddy the waters a bit, the gist contouring algorithm looks to my eye 
like Paul Bourke's CONREC algorithm, which may or may not be patented.
O software patents, how I hate thee!
-- 
Robert Kern
rk...@uc...
"In the fields of hell where the grass grows high
 Are the graves of dreams allowed to die."
 -- Richard Harter

gary ruben wrote:
> True, I didn't pay much attention to licencing. In light of it though, here
> are a couple more links to a couple of gentlemen who may be worth
> grovelling to should the need arise. No specific licencing is mentioned.
> 
> <http://mahi.ucsd.edu/parker/Software/>
I know Bob. I'll ask him.
-- 
Robert Kern
rk...@uc...
"In the fields of hell where the grass grows high
 Are the graves of dreams allowed to die."
 -- Richard Harter

True, I didn't pay much attention to licencing. In light of it though, here
are a couple more links to a couple of gentlemen who may be worth
grovelling to should the need arise. No specific licencing is mentioned.
<http://mahi.ucsd.edu/parker/Software/>
The documentation says the contouring code was written by this guy who is
the director of the SETI@home project:
<http://setiweb.ssl.berkeley.edu/~davea/resume.html>
regards,
Gary
*********** REPLY SEPARATOR ***********
On 28/10/2004 at 09:25 John Hunter wrote:
> >>>>> "gary" == gary ruben <gr...@bi...> writes:
> 
> gary> Some more possible contour generating code links:
> 
> [1] http://www.geog.uni-hannover.de/grass/
> [2] http://www.triplexware.huckfinn.de/geogfix.html
> [3] http://www.triplexware.huckfinn.de/contweber.html
> [4] http://astronomy.swin.edu.au/~pbourke/projection/conrec/
> [5] http://members.bellatlantic.net/~vze2vrva/
> 
> Hi Gary, thanks for the tips. Note that [1] appears to be GPLd and
> we're looking for a routine with licenses as permissive as the
> PSF/matplotlib license. I believe [2] and [4] are both pointing to
> the same algorithm, by Paul Bourke - this one has a C++ implementation
> that includes the following license restriction
> 
> Additionally, the authors grant permission to modify this software
> and its documentation for any purpose, provided that such
> modifications are not distributed without the explicit consent of
> the authors and that existing copyright notices are retained in all
> copies. Some of the algorithms implemented by this software are
> patented, observe all applicable patent law.
> 
> Since this code implements the Bourke algorithm, I assume the other
> implementations have the same patent restrictions, but I haven't taken
> a close look. 
> 
> [3] is released under the MPL -
> http://www.mozilla.org/MPL/MPL-1.1.html, which as I understand has a
> complex licensing history - it certainly takes a lawyer to read
> through it - I'm not sure what the status is.
> 
> [5] is certainly as possibility, if as you say, we contact the author
> and see if he is willing to release it to us.
> 
> Hopefully, all of this is moot, as I understand that STSci has been
> working on a routine ripped from gist and Perry says they are close to
> having a prototype. I still think it's worthwhile investigating
> whether marching squares is patented or enforceable - Mr Horton's
> response was not terribly enlightening.
> 
> JDH
> 
> 
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------------------------------------
Gary Ruben gr...@bi...
<http://users.bigpond.net.au/gazzar>

>>>>> "gary" == gary ruben <gr...@bi...> writes:
 gary> Some more possible contour generating code links:
 [1] http://www.geog.uni-hannover.de/grass/
 [2] http://www.triplexware.huckfinn.de/geogfix.html
 [3] http://www.triplexware.huckfinn.de/contweber.html
 [4] http://astronomy.swin.edu.au/~pbourke/projection/conrec/
 [5] http://members.bellatlantic.net/~vze2vrva/
Hi Gary, thanks for the tips. Note that [1] appears to be GPLd and
we're looking for a routine with licenses as permissive as the
PSF/matplotlib license. I believe [2] and [4] are both pointing to
the same algorithm, by Paul Bourke - this one has a C++ implementation
that includes the following license restriction
 Additionally, the authors grant permission to modify this software
 and its documentation for any purpose, provided that such
 modifications are not distributed without the explicit consent of
 the authors and that existing copyright notices are retained in all
 copies. Some of the algorithms implemented by this software are
 patented, observe all applicable patent law.
Since this code implements the Bourke algorithm, I assume the other
implementations have the same patent restrictions, but I haven't taken
a close look. 
[3] is released under the MPL -
http://www.mozilla.org/MPL/MPL-1.1.html, which as I understand has a
complex licensing history - it certainly takes a lawyer to read
through it - I'm not sure what the status is.
[5] is certainly as possibility, if as you say, we contact the author
and see if he is willing to release it to us.
Hopefully, all of this is moot, as I understand that STSci has been
working on a routine ripped from gist and Perry says they are close to
having a prototype. I still think it's worthwhile investigating
whether marching squares is patented or enforceable - Mr Horton's
response was not terribly enlightening.
JDH

Some more possible contour generating code links:
http://www.geog.uni-hannover.de/grass/
http://www.triplexware.huckfinn.de/geogfix.html
http://www.triplexware.huckfinn.de/contweber.html
http://astronomy.swin.edu.au/~pbourke/projection/conrec/
These weren't too hard to find. There are probably more out there to be
found.
Gary R.
*********** REPLY SEPARATOR ***********
On 28/10/2004 at 23:41 gary ruben wrote:
> A quick google reveals this guy's contouring code:
> <http://members.bellatlantic.net/~vze2vrva/>
> which I found via this:
> <http://www.codeproject.com/cpp/contour.asp>
> Given that he has some C source code on his site, perhaps Mr Aramini
would
> be happy to allow its use into matplotlib. He certainly looks like a
happy
> fellow :-)
> 
> Gary R.
------------------------------------
Gary Ruben gr...@bi...
<http://users.bigpond.net.au/gazzar>

A quick google reveals this guy's contouring code:
<http://members.bellatlantic.net/~vze2vrva/>
which I found via this:
<http://www.codeproject.com/cpp/contour.asp>
Given that he has some C source code on his site, perhaps Mr Aramini would
be happy to allow its use into matplotlib. He certainly looks like a happy
fellow :-)
Gary R.
*********** REPLY SEPARATOR ***********
On 28/11/2004 at 06:34 Greg Whittier wrote:
> I'd suggest seeing how VTK handles this. I believe they have a patented
> and a non-patented contour filter (vtkContourFilter and
> vtkMarchingContourFilter). The VTK package has a python interface. The
> goals page mentions on embedding VTK for future 3d functionality. Could
> VTK be embedded to leverage some of the other good work they've done?
> 
> Greg
<snip>
------------------------------------
Gary Ruben gr...@bi...
<http://users.bigpond.net.au/gazzar>

I'd suggest seeing how VTK handles this. I believe they have a patented
and a non-patented contour filter (vtkContourFilter and
vtkMarchingContourFilter). The VTK package has a python interface. The
goals page mentions on embedding VTK for future 3d functionality. Could
VTK be embedded to leverage some of the other good work they've done?
Greg
On Tue, 2004年10月26日 at 21:07, gary ruben wrote:
> Rather than drawing the conclusion that Carl can't read English or that he
> thinks we're going to start a fundraiser to raise the 10000,ドル I think we
> can guess that marching squares is probably NOT covered by the patent, but
> that seeing a big dollar number and his title should scare us off testing
> the patent. Presumably there are alternatives to marching squares and I'd
> pursue them, unless you feel like poking Carl with another stick :-)
> 
> Gary R
> 
> *********** REPLY SEPARATOR ***********
> 
> On 26/10/2004 at 12:59 Horton, Carl (GE Healthcare) wrote:
> 
> > Curtis: attached is a copy of the license agreement required for use of
> > the Marching Cubes/VTK algorithms and related software. Once this
> > agreement has been executed and GE has received the requisite payments,
> > your license will be automatic. Thanks.
> > 
> > 			
> > 
> > 
> > > Carl B. Horton
> > > GE Healthcare
> > > Chief IP Counsel
> > > 
> > > P: 262 513-4022
> > > F: 414 918-1641
> > > C: 262 385-7315
> > > D: *320-4022 
> > > E: Car...@me...
> > www.gehealthcare.com
> > 
> > -----Original Message-----
> > From: Curtis Cooper [mailto:cu...@hi...]
> > Sent: Friday, October 01, 2004 2:42 PM
> > To: Horton, Carl (GE Healthcare)
> > Cc: Matplotlib Developers
> > Subject: Marching Squares Algorithm
> > 
> > 
> > Dear Mr. Horton:
> > 
> > I am investigating options for creating 2D contour plots for the freely
> > distributable Matplotlib package (http://matplotlib.sourceforge.net/).
> > The Matplotlib license requires all the software to be free for
> > noncommercial and commercial distribution.
> > 
> > I had the idea to try to implement marching squares for this package. We
> > know the marching cubes algorithm is patented, but what about the 2D
> > marching squares? Can my implementation be used in this freely
> > distributed package without obtaining a license grant?
> > 
> > Thanks,
> > Curtis
> 
> ------------------------------------
> Gary Ruben gr...@bi...
> <http://users.bigpond.net.au/gazzar>
> 
> 
> 
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-- 
Greg Whittier <gr...@th...>