visualpython-users

[Visualpython-users] Re: Selling VPython Art

[Zbigniew <ze...@in...>]

>One of my wild & crazy schemes is to help finance the
>development of VPython by selling artworks created by

Publishing articles concerning VPython
in popular computer magazines seems to
be good idea. Moreover I guess there
are magazines for teachers of maths,
physics or chemistry.

Zbigniew Trzcionkowski <ze...@in...>

[Visualpython-users] Selling VPython Art

[Joel K. <jj...@ya...>]

One of my wild & crazy schemes is to help finance the
development of VPython by selling artworks created by
using the language. As a starting point, I've recently
put together an early prototype of a poster based on
screenshots from my face.py program. I'm following my
usual practice of not posting any attachments to a
list, so interested parties can individually request a
copy of the jpeg.

Joel



	
		
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[Visualpython-users] game in python

[Zbigniew <ze...@in...>]

Hello.

I'm new to python at all.
Currently on studies we are learning python
and I've invented for myself subject to
write 3d snake game with visual.
It should be there:
http://free.art.pl/zeeball/snake3d.tar.bz2
or
http://zeeball.w.interia.pl/bin/snake3d.tar.bz2
It's almost ready so now I ask more advanced
users for betatesting, bugfixing,
optimising and so on...
There is also strange bug I'm looking for
in the game maybe somebody could help.

Thanks in advance.

Zbigniew Trzcionkowski <ze...@in...>

[Visualpython-users] Links, Art, &c

[Joel K. <jj...@ya...>]

I just sent some relevant links to Bruce
Sherwood--then I realized that the whole list should
see them:

http://www.nsf.gov/od/lpa/events/neuro/behind.htm

http://www.nsf.gov/od/lpa/events/sevc/judge_crit.htm

http://www.isama.org

http://www.ganoksin.com/joel

While I'm posting anyway. . . . I hope that a lot of
you have had a chance to look at my stuff up on the
"contributions" page at VPython.org. I have ideas for
lots of other ways to help expand VPython from a
scientific tool to a more artistic one, but all of the
really groovy projects would require some outside
financial backing. If any company wants to hire me to
transform their corporate logo into a fancy VPython
animation, drop me an email. :-)

Joel



	
		
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[Visualpython-users] Curved capital letters

[Bruce S. <Bru...@nc...>]

In the "Contributed programs" section of vpython.org is a useful program 
capital_letters.py from Joel Kahn which implements the display of 
capital letters using curves. So now there are two 3D capital-letter 
"fonts" available for use in VPython, Joel's new curvy letters and the 
old block-letter set. Thanks, Joel.

Bruce Sherwood

Re: [Visualpython-users] VPython problems on windows 98 and windows 2000

[Bruce S. <Bru...@nc...>]

These are probably video driver problems, not operating system problems. 
The first thing to do is to update the video drivers, or use the generic 
Microsoft video driver. The second thing to do if that doesn't solve the 
problem is in the video control panel set hardware acceleration to off.

Bruce Sherwood

iu...@wa... wrote:

>
> Hi,
>  
> I have these problems with VPython, can anyone help, please?
>  
> I installed the latest version of VPython from its home page (not the 
> new ver 29 one) on Windows 98 and it worked just fine, using Pythin 2.3.3
> Then I installed the same Python and VPython on two more PCs, one 
> running Windows 98, the other running Windows 2000. I got two problems:
> Windows 98: Whenever the scene window gets BACK to focus (i.e., I move 
> the focus to a different window, then click back on the scene window) 
> a page fault is generated and the application crashes.
> Windows 2000: I cannot start any application that uses VPython. It 
> generates messages about failing to initialize OpenGL, failing to 
> create context and the like.
> On the Windows System path there exists, of course, an original OpenGL 
> file that comes with Windows 2000, so I don't get why there should be 
> a problem.
>  
> Is anyone familiart with these problems?
>  
> Thanks,
> IU
> ------------------------------------------------------------------------
>
>
> ------------------------------------------------------------------------
> Walla! Mail, Get Your Private, Free E-mail from Walla! at:
> http://mail.walla.co.il

[Visualpython-users] VPython problems on windows 98 and windows 2000

[<iu...@wa...>]

Hi,

I have these problems with VPython, can anyone help, please?

I installed the latest version of VPython from its home page (not the new ver 29 one) on Windows 98 and it worked just fine, using Pythin 2.3.3
Then I installed the same Python and VPython on two more PCs, one running Windows 98, the other running Windows 2000. I got two problems:
Windows 98: Whenever the scene window gets BACK to focus (i.e., I move the focus to a different window, then click back on the scene window) a page fault is generated and the application crashes.
Windows 2000: I cannot start any application that uses VPython. It generates messages about failing to initialize OpenGL, failing to create context and the like.
On the Windows System path there exists, of course, an original OpenGL file that comes with Windows 2000, so I don't get why there should be a problem.

Is anyone familiart with these problems?

Thanks,
IU

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[Visualpython-users] Joel Kahn faces.py

[Bruce S. <Bru...@nc...>]

Joel Kahn contributed an amusing faces.py. See it in the contributed 
section of vpython.org. Thanks, Joel.

Bruce Sherwood

Re: [Visualpython-users] Vpython - SUSE 9.0 - Newbie

[Jonathan B. <jbr...@ea...>]

On Sat, 2004-05-01 at 13:58, Bruno Fletcher wrote:
> Hi there,
> I am having troubles installing Vpython. I am using Suse - 9.0, and followed 
> all the special steps required to install Vpython under this distro that are 
> described in Vpython's installation web page 
> (http://vpython.org/linux_download.html) . Everythng seems to work fine 
> until I run make command and get the following error:
> 
> In file included from arrow.cpp:2:
> xgl.h:10:29: gtkgl/gtkglarea.h: No such file or directory
> 
> Does anyone know what is going on?
> 
> Thanks,
> Bruno

IIRC, SUSE 9 places all of the GNOME stuff in /opt/gnome (or something
very similar).  But, g++ is not instructed to look into
/opt/gnome/include for header files.  You should set the CPPFLAGS
environment variable to "-I/opt/gnome/include" and re-run configure and
make.

HTH,
-Jonathan Brandmeyer

[Visualpython-users] RE: Visualpython-users digest, Vol 1 #526 - 1 msg

[Stephen M. <spm...@ho...>]

Joel,

Could you please upload to the demos page?

Thanks,
Stephen


>From: vis...@li...
>Reply-To: vis...@li...
>To: vis...@li...
>Subject: Visualpython-users digest, Vol 1 #526 - 1 msg
>Date: Fri, 30 Apr 2004 20:27:00 -0700
>
>Send Visualpython-users mailing list submissions to
>	vis...@li...
>
>To subscribe or unsubscribe via the World Wide Web, visit
>	https://lists.sourceforge.net/lists/listinfo/visualpython-users
>or, via email, send a message with subject or body 'help' to
>	vis...@li...
>
>You can reach the person managing the list at
>	vis...@li...
>
>When replying, please edit your Subject line so it is more specific
>than "Re: Contents of Visualpython-users digest..."
>
>
>Today's Topics:
>
>    1. New Vpython Program (Joel Kahn)
>
>--__--__--
>
>Message: 1
>Date: Fri, 30 Apr 2004 11:10:45 -0700 (PDT)
>From: Joel Kahn <jj...@ya...>
>To: vis...@li...
>Subject: [Visualpython-users] New Vpython Program
>
>I've put together a vpython animation that some of you
>might find mildly entertaining; it could probably be
>used as a demo of vpython's capabilities. The source
>code is a bit too long to post to the list, so curious
>parties should send me an off-list request and I'll
>send the .py file to you as an attachment.
>
>Joel
>
>
>
>
>
>__________________________________
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>
>
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[Visualpython-users] Vpython - SUSE 9.0 - Newbie

[Bruno F. <fle...@ho...>]

Hi there,
I am having troubles installing Vpython. I am using Suse - 9.0, and followed 
all the special steps required to install Vpython under this distro that are 
described in Vpython's installation web page 
(http://vpython.org/linux_download.html) . Everythng seems to work fine 
until I run make command and get the following error:

In file included from arrow.cpp:2:
xgl.h:10:29: gtkgl/gtkglarea.h: No such file or directory

Does anyone know what is going on?

Thanks,
Bruno

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[Visualpython-users] New Vpython Program

[Joel K. <jj...@ya...>]

I've put together a vpython animation that some of you
might find mildly entertaining; it could probably be
used as a demo of vpython's capabilities. The source
code is a bit too long to post to the list, so curious
parties should send me an off-list request and I'll
send the .py file to you as an attachment.

Joel



	
		
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Re: [Visualpython-users] Re: VPython / python-gtk integration

[Jonathan B. <jdb...@un...>]

Fionn Behrens wrote:

>P.S.: Does vpython have a command to explicitly close (and reopen) the
>display window from python without user interaction? Along the lines of
>the show() and hide() functionality of gtk...
>
>Best regards,
>            Fionn
>  
>

Set the visibility property on the display instance to 0 (1 is the default).

HTH,
Jonathan Brandmeyer

Re: [Visualpython-users] Re: VPython / python-gtk integration

[Gary P. <pa...@in...>]

Since there's some discussion going on this subject, let me be explicit
about what I'm after.

I'd like to create an application with one root window containing various
control, canvas, and frame widgets.  I'd like one of those widgets to be a
visual canvas.  Right now I can create a Tkinter window containing all the
controls and graphs, but the visual canvas exists in it's own (GTK?) window.
It works, but screen management is awkward (two windows).  I haven't
approached the integration problem yet because I have no experience with GTK
at the moment.  Furthermore, this is a low-priorty task for me.  But I'm
watching and will contribute if I can.

The application is interactive physics demos/simulations.

-gary


----- Original Message ----- 
From: "Gary Pajer" <pa...@in...>



> I'm interested in what you are trying to do.
>
> Could you please post a minimal complete vpython/gtk script ... maybe one
> that just places a sphere at the origin.
>
> Thanks,
> gary
>
> ----- Original Message ----- 
> From: "James Philip Roper" <u32...@an...>
> To: <vis...@li...>
> Sent: Monday, April 26, 2004 10:05 PM
> Subject: [Visualpython-users] Re: VPython / python-gtk integration
>
>
> > I have successfully run a simulation in VPython that had a pygtk
> > interface using threads.  The main thread thread ran the GTK main loop,
> > then I had a thread for the simulation.  I had issues quitting the
> > program (though I often also have the same issues when I'm not using
> > threading or pygtk), and there also seemed to be various quirks when I
> > tried running it on other platforms.  This is the basic idea:
> >
> > import threading
> >
> > class simulator(threading.Thread):
> >     def __init__(self):
> >        threading.Thread.__init__(self)
> >        self.runningEvent = threading.Event()
> >     def run(self):
> >        while 1:
> >           self.runningEvent.wait()
> >           # simulation stuff
> >
> > def startStopCallback(widget, data):
> >     if s.runningEvent.isSet():
> >        s.runningEvent.clear()
> >     else:
> >        s.runningEvent.set()
> >
> > gtk.threads_init()
> > # gtk setup stuff including a start/stop button
> >
> > s = simulator()
> > s.start()
> >
> >
> > The gtk.threads_init() must be called if you are using pygtk and
> threading.
> >
> > One thing that you need to ensure, if you are ever making GTK calls from
> > a thread other than the thread GTK is running in, you must use
> > gtk.threads_enter() and gtk.threads_leave() before and after you make
> > the call.
>
>
>
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Re: [Visualpython-users] Re: VPython / python-gtk integration

[Gary P. <pa...@in...>]

I'm interested in what you are trying to do.

Could you please post a minimal complete vpython/gtk script ... maybe one
that just places a sphere at the origin.

Thanks,
gary

----- Original Message ----- 
From: "James Philip Roper" <u32...@an...>
To: <vis...@li...>
Sent: Monday, April 26, 2004 10:05 PM
Subject: [Visualpython-users] Re: VPython / python-gtk integration


> I have successfully run a simulation in VPython that had a pygtk
> interface using threads.  The main thread thread ran the GTK main loop,
> then I had a thread for the simulation.  I had issues quitting the
> program (though I often also have the same issues when I'm not using
> threading or pygtk), and there also seemed to be various quirks when I
> tried running it on other platforms.  This is the basic idea:
>
> import threading
>
> class simulator(threading.Thread):
>     def __init__(self):
>        threading.Thread.__init__(self)
>        self.runningEvent = threading.Event()
>     def run(self):
>        while 1:
>           self.runningEvent.wait()
>           # simulation stuff
>
> def startStopCallback(widget, data):
>     if s.runningEvent.isSet():
>        s.runningEvent.clear()
>     else:
>        s.runningEvent.set()
>
> gtk.threads_init()
> # gtk setup stuff including a start/stop button
>
> s = simulator()
> s.start()
>
>
> The gtk.threads_init() must be called if you are using pygtk and
threading.
>
> One thing that you need to ensure, if you are ever making GTK calls from
> a thread other than the thread GTK is running in, you must use
> gtk.threads_enter() and gtk.threads_leave() before and after you make
> the call.

[Visualpython-users] Visual 2.9.3 installation

[James R. <u32...@an...>]

I've tried to build and install visual python 2.9.3 with python2.2 on fedora 
core 1, when I do it installs the following files:
cvisualmodule  cvisualmodule.1  cvisualmodule.1.0.0  cvisualmodule.la

This is differs from previous installations that install cvisualmodule.so, 
cvisualmodule.so.1 etc.  When I import visual, it can't find the cvisual 
module.  Linking cvisualmodule.so to cvisualmodule.1.0.0 fixes the problem.  
I'm not that familiar with installation scripts, but shouldn't it be 
installing the files with the .so extension?

James

[Visualpython-users] Re: VPython / python-gtk integration

[James P. R. <u32...@an...>]

I have successfully run a simulation in VPython that had a pygtk 
interface using threads.  The main thread thread ran the GTK main loop, 
then I had a thread for the simulation.  I had issues quitting the 
program (though I often also have the same issues when I'm not using 
threading or pygtk), and there also seemed to be various quirks when I 
tried running it on other platforms.  This is the basic idea:

import threading

class simulator(threading.Thread):
    def __init__(self):
       threading.Thread.__init__(self)
       self.runningEvent = threading.Event()
    def run(self):
       while 1:
          self.runningEvent.wait()
          # simulation stuff

def startStopCallback(widget, data):
    if s.runningEvent.isSet():
       s.runningEvent.clear()
    else:
       s.runningEvent.set()

gtk.threads_init()
# gtk setup stuff including a start/stop button

s = simulator()
s.start()


The gtk.threads_init() must be called if you are using pygtk and threading.

One thing that you need to ensure, if you are ever making GTK calls from 
a thread other than the thread GTK is running in, you must use 
gtk.threads_enter() and gtk.threads_leave() before and after you make 
the call.

[Visualpython-users] VPython and PY2EXE

[Bruce P. <ter...@ho...>]

I'm trying to package a VPython application with PY2EXE. The demo programs 
with P2EXE work great both on the original machine or a clean one. 
Packaging one of the VPython demos (either Hanoi.py or stonehenge.py) 
appears to work fine on the machine used to compile but when moved to a 
"clean" (no VPython installed) machine gives an error:
"The procedure entry point IsWow64Process could not be located in the 
dynamic link library KERNEL32.dll". (compile machine was WinXP, test 
machine is Win2k). I don't know if this is a VPython problems or a PY2EXE 
problem  but I thought I'd see if anyone else has run across this 
problem.  thanks

Bruce


Bruce Peterson, Ph.D.
Terastat, Inc
Information Access Systems
Voice (425) 466 7344
Fax (206) 350 3685

Re: [Visualpython-users] VPython / python-gtk integration

[Bruce S. <Bru...@nc...>]

Not sure that this will help, but it might give you some ideas to look 
at the VPython demo program Tk-Visual.py.

Bruce Sherwood

Fionn Behrens wrote:

>Hello,
>
>maybe a VPython developer here is able to give me a hint: I am trying to
>start a VPython 3D display from within a python application that is using
>python-gtk (1.2) for its GUI.
>
>It looks like VPython, based on GTK as well, brings along its own
>mainloop() which interferes with python-gtk's one.
>
>Do you have any idea how I can integrate the event loop of VPython with
>the main loop of my python-gtk frontend?
>
>
>br,
>    Fionn
>
>
>
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Re: [Visualpython-users] rotation and axis

[Jonathan B. <jdb...@un...>]

Kuzminski, Stefan R wrote:

> Hi,
>
> If I rotate a shape, I seem to get an odd axis value after the rotation=
..
>
> here is a simple program=85
>
> from visual import *
>
> shape =3D cylinder( pos=3D( 0, 0, 0 ),
>
> length=3D.1,
>
> radius=3D.01 )
>
> print =91before=92, shape.axis
>
> shape.rotate( angle=3Dpi/2, axis=3D(0,0,1))
>
> print =91after=92, shape.axis
>
> and here is the output.. shouldn=92t =91after=92 be [0, 0.1, 0] am I mi=
ssing=20
> something?
>
> C:\>python tmp.py
>
> Visual-2003-10-05
>
> before [0.1 0 0]
>
> after [6.12303e-018 0.1 0] =DF ???
>
> thanks,
>
> Stefan
>

The algorithms for generalized rotation unavoidably introduce a tiny=20
error (this example shows an error 18 orders of magnitude smaller than=20
the value!). Keep in mind that since pi cannot be represented exactly in=20
a computer, neither is pi/2 nor is rotating by pi/2.

HTH,
Jonathan Brandmeyer

[Visualpython-users] rotation and axis

[Kuzminski, S. R <SKu...@fa...>]

Hi,

=20

If I rotate a shape, I seem to get an odd axis value after the
rotation..

=20

here is a simple program...

=20

from visual import *

=20

shape =3D cylinder( pos=3D( 0, 0, 0 ),

                  length=3D.1,

                  radius=3D.01 )

print 'before', shape.axis

shape.rotate( angle=3Dpi/2, axis=3D(0,0,1))

print 'after', shape.axis

=20

=20

and here is the output..  shouldn't 'after' be [0, 0.1, 0]  am I missing
something?

=20

=20

C:\>python tmp.py

Visual-2003-10-05

before [0.1 0 0]

after [6.12303e-018 0.1 0]   <-- ???

=20

=20

thanks,

Stefan

=20

Re: [Visualpython-users] Release: VPython 2.9.3

[Jonathan B. <jbr...@ea...>]

On Sat, 2004-04-10 at 12:43, Jonathan Brandmeyer wrote:
> This release fixes a crash that occurred when using graphs in the 2.9.2
> release.
> 
> Source and pre-built executable packages are available at
> http://www4.ncsu.edu:~/jdbrandm/ (the OSX 10.3 build is still in

That would be http://www4.ncsu.edu/~jdbrandm/.  Prebuilt packages are
available for Mac and Windows now.

-Jonathan Brandmeyer

[Visualpython-users] Release: VPython 2.9.3

[Jonathan B. <jbr...@ea...>]

This release fixes a crash that occurred when using graphs in the 2.9.2
release.

Source and pre-built executable packages are available at
http://www4.ncsu.edu:~/jdbrandm/ (the OSX 10.3 build is still in
progress).

-Jonathan Brandmeyer

[Visualpython-users] Release: VPython 2.9.2

[Jonathan B. <jbr...@ea...>]

This release incorporates the following changes:

Scenes that use thin curve objects now have their extent calculated
properly.  The primary symptom of this bug was that parts of some
objects nearest to the camera would be clipped out of the scene.  Thanks
to Rob Salgado for reporting this bug.

Objects that are created with the visible property set to 0 no longer
cause spurious initialization of the default display.  The graph module
was affected by this problem.

Several clarifications have been made to the installation instructions
for source builds.  Thanks to Andrew Dougherty for his patches.

The `vpython` script has been modified such that it can be used to start
Idle on any VPython script in the correct environment.

At the moment, I only have a source package for download at
http://www4.ncsu.edu/~jdbrandm/.  The binary packages will be posted
tomorrow.

Enjoy!
-Jonathan Brandmeyer

Re: [Visualpython-users] Small vpython script suggestion

[Jonathan B. <jbr...@ea...>]

On Thu, 2004-04-08 at 14:03, Andrew Dougherty wrote:
> I'm usually not working on demos, so I find the vpython's script default
> working directory inconvenient.  Here's a little patch I apply to my local
> copy.  If vpython gets no arguments, it starts up in the demo directory as
> before.  If vpython *does* get an argument, however, it opens up the
> indicated file.

Done.  It will be in the next release.

Thanks,
Jonathan Brandmeyer