visualpython-users

RE: [Visualpython-users] openCASCADE

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

I suppose they are very different pieces of software and one of the nice
things about vpython is how focused it is.  I'm wishing that I could
build more complex shapes, especially with Boolean shape operations,
assemble them into mechanisms and have them simulated in a 'real'
environment.  This is probably out of the scope of vpython.

=20

S

=20

-----Original Message-----
From: vis...@li...
[mailto:vis...@li...] On Behalf Of
Arthur
Sent: Tuesday, June 01, 2004 10:43 AM
To: vis...@li...
Subject: re: [Visualpython-users] openCASCADE

=20

=20

=20

  _____ =20

From: Arthur [mailto:aj...@ix...]=20
Sent: Tuesday, June 01, 2004 1:42 PM
To: 'Kuzminski, Stefan R'; 'vis...@li...'
Subject: RE: [Visualpython-users] openCASCADE

=20

From: vis...@li...
[mailto:vis...@li...] On Behalf Of
Kuzminski, Stefan R

Sent: Tuesday, June 01, 2004 10:57 AM

To: vis...@li...

Subject: [Visualpython-users] openCASCADE

=20

Has anyone looked into bringing the OpenCASCADE python bindings into
vpython?

=20

http://www.pythonizer.org/pythoncascade/pythoncascade.html

=20

=20

=20

=20

To what end ?

=20

Don't OpenCASCADE and VPython have very different purposes and scopes.

=20

I tend to see the "smallness" and focus of VPython as one of its main
strengths. =20

=20

And if one wants to work with something broad and large, what does
VPython bring to OpenCascade that isn't already there?  The question's
intention being more than rhetorical, as I don't know anything about
OpenCascade beyond what I see on the web site.

=20

Art

re: [Visualpython-users] openCASCADE

[Arthur <ajs...@op...>]

 

 

  _____  

From: Arthur [mailto:aj...@ix...] 
Sent: Tuesday, June 01, 2004 1:42 PM
To: 'Kuzminski, Stefan R'; 'vis...@li...'
Subject: RE: [Visualpython-users] openCASCADE

 

From: vis...@li...
[mailto:vis...@li...] On Behalf Of
Kuzminski, Stefan R

Sent: Tuesday, June 01, 2004 10:57 AM

To: vis...@li...

Subject: [Visualpython-users] openCASCADE

 

Has anyone looked into bringing the OpenCASCADE python bindings into
vpython?

 

http://www.pythonizer.org/pythoncascade/pythoncascade.html

 

 

 

 

To what end ?

 

Don't OpenCASCADE and VPython have very different purposes and scopes.

 

I tend to see the "smallness" and focus of VPython as one of its main
strengths.  

 

And if one wants to work with something broad and large, what does VPython
bring to OpenCascade that isn't already there?  The question's intention
being more than rhetorical, as I don't know anything about OpenCascade
beyond what I see on the web site.

 

Art

[Visualpython-users] openCASCADE

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

Has anyone looked into bringing the OpenCASCADE python bindings into
vpython?

=20

http://www.pythonizer.org/pythoncascade/pythoncascade.html

=20

S

[Visualpython-users] Program Using 'Faces' Object

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

The source code that I put below the dotted line shows
an unusual way of employing the "faces" object.
Teachers of math and/or computer science might want to
challenge their students to figure out how and why the
program produces the visual output that it does. The
code allows for lots of variations to experiment with
in just about all of its sections. I'm afraid that the
long "fa.append" line got messed up by my email
system, but it should be easy to fix.

Joel

..............................................

from visual import *
from time import *

autocenter = 1

scene = display()
scene.width = 1024
scene.height = 738
scene.x = 0
scene.y = 0

# Rotating 'Faces' Object

fr = frame ()

fa = faces (frame = fr)

range = 20.0

step = pi / range

for nn in arange (-range, range, step):
    for qq in arange (-range, range, step):
        fa.append (pos = (cos (nn), sin (qq), 
        sin (qq + nn)), normal = (0.99, 0.99, 0.99),
        green = nn / range, blue = qq / range)
        
while 2.0 > 1.0:
    tt = 8000.0 / time ()
    fr.rotate (angle = tt, axis = (step, step, step))



	
		
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Re: [Visualpython-users] mac Panther and vpython

[Martin C. <cos...@wa...>]

Jonathan Brandmeyer wrote:
[]
> Linux and OSX have suffered from this problem for quite a while, but I
> think that I may have solved it.  Please try out this patch and let me
> know how it works for you.  It should be applied to
> cvisual/platlinux.cpp on the latest 2.1.x release.

This seems to improve the situation (still for the gas.py demo): In most 
cases, I can now just type ESC in one of the two output windows and it 
exits cleanly.

The problem is that this thing is not completely deterministic:

In the old (unpatched) version, most of the time typing ESC in the 
animation window would close this window but leave the bar-graph window 
open and the process resistent against Ctrl-C. Even hitting the 
bar-graph window with xkill would only kill this window, but leave the 
python process running and unresponsive to Ctrl-C. It had to be killed 
with kill from another shell.

In other cases (without recognizable pattern), upon hitting ESC in the 
animation window, it would empty that window but not close it and leave 
both windows unresponsive to attempts to close them. In this case, 
hitting Ctrl-C 3 times in the console window would kill the process and 
the windows.

With the new (patched) version, most of the time, hitting ESC in one of 
two output windows closes both and exits the process. Sometimes, it left 
the windows empty but open and unclosable. But then Ctrl-C worked every 
time.

In any case, the patch is now included in the updated Fink package.

-- 
Martin

Re: [Visualpython-users] mac Panther and vpython

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

On Wed, 2004-05-26 at 03:25, Martin Costabel wrote:
> Aaron Titus wrote:
> 
> > That was very simple!  Thank you!
> > 
> > I still have a problem with the demo program, gas.py. I cannot close the 
> > program. I suspect that I'll have the same problem with any program that 
> > instantiates a graph.
> 
> I confirm, I have the same problem. No idea where the bug is.

Linux and OSX have suffered from this problem for quite a while, but I
think that I may have solved it.  Please try out this patch and let me
know how it works for you.  It should be applied to
cvisual/platlinux.cpp on the latest 2.1.x release.

Thanks,
Jonathan Brandmeyer

Re: [Visualpython-users] mac Panther and vpython

[Martin C. <cos...@wa...>]

Aaron Titus wrote:

> That was very simple!  Thank you!
> 
> I still have a problem with the demo program, gas.py. I cannot close the 
> program. I suspect that I'll have the same problem with any program that 
> instantiates a graph.

I confirm, I have the same problem. No idea where the bug is.

-- 
Martin

Re: [Visualpython-users] mac Panther and vpython

[Aaron T. <ti...@ma...>]

That was very simple!  Thank you!

I still have a problem with the demo program, gas.py. I cannot close 
the program. I suspect that I'll have the same problem with any program 
that instantiates a graph.

AT

On May 25, 2004, at 5:22 PM, Martin Costabel wrote:
> If you install visual-py23 from Fink, you don't need Python-2.2. Here 
> are the *complete* instructions to install VPython with Fink:
>
> 1. Install Fink
>
> 2. Tell Fink to install visual-py23, either from binary or from 
> source. Read the Fink documentation how to do this, but it does not 
> take more than either a mouse click in FinkCommander or typing "fink 
> install visual-py23" in a Terminal window.
>
> This is all, everything else is taken care of automatically.
>
> -- 
> Martin
>
>
>
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Re: [Visualpython-users] mac Panther and vpython

[Martin C. <cos...@wa...>]

Aaron Titus wrote:
> ok, I did a clean install of Mac OS 10.3 (Panther).
> 
> I installed Fink and the necessary programs, including both Python 2.2 
> and Python 2.3.
> 
> I installed VPython according to the instructions at vpython.org.
[]
> (3) Why must we use Python 2.2?  I thought that we could use Python 2.3, 
> but expanding the tarball only installs visual in the Python 2.2 folder.

If you install visual-py23 from Fink, you don't need Python-2.2. Here 
are the *complete* instructions to install VPython with Fink:

1. Install Fink

2. Tell Fink to install visual-py23, either from binary or from source. 
Read the Fink documentation how to do this, but it does not take more 
than either a mouse click in FinkCommander or typing "fink install 
visual-py23" in a Terminal window.

This is all, everything else is taken care of automatically.

-- 
Martin

[Visualpython-users] mac Panther and vpython

[Aaron T. <ti...@ma...>]

ok, I did a clean install of Mac OS 10.3 (Panther).

I installed Fink and the necessary programs, including both Python 2.2 
and Python 2.3.

I installed VPython according to the instructions at vpython.org.

Here are my issues:

(1) My PATH does not include /sw/bin when running X11. Evidently I need 
a .xinitrc file that sets the PATH. Any suggestions? Creating a new 
.xinitrc file crippled X11.

(2) In 10.2 (Jaguar), I had a problem running a vpython script that 
opened a graph in a separate window. I always had to kill the process 
in order to exit. I thought that this was fixed in the latest vpython; 
however, when I ran the gas.py demo, I had the same problem trying to 
close the windows. Finally, it generated this error:

Xlib:  extension "Apple-DRI" missing on display ":0.0".
Xlib:  extension "Apple-DRI" missing on display ":0.0".

and I had to once again kill the process.

(3) Why must we use Python 2.2?  I thought that we could use Python 
2.3, but expanding the tarball only installs visual in the Python 2.2 
folder.


Thanks for the help,

Aaron

[Visualpython-users] visual on FreeBSD

[Lee H. <mi...@ho...>]

Just a quick note that with the lastest gcc 3.3 upgrade in
FreeBSD ports (3.3.4 20040505) I am now able to build
visual-2.9.3 and run many of the examples.

bounce.py
bounce2.py
colorsliders.py
controlstest.py
crystal_old.py
dipole.py
doublependulum.py
hanoi.py


In the examples which work, the mouse buttons work
just fine also.


Most of the examples die with :

Abort (core dumped)

convex.py
crossproduct.py
crystal.py (but not crystal_old.py)
drape.py
faces_cone.py
faces_heightfield.py
gas.py
graphtest.py
gyro2.py
helix.py
lathe.py
lorenz.py
orbit.py
planar.py
randombox.py
stars.py
stonehenge.py
text.py
texttest.py
tictac.py
toroid.py
toroid_drag.py
wave.py


crossproduct.py gives ...

Segmentation fault (core dumped)



gyro.py finishes with ...

Traceback (most recent call last):
  File "gyro.py", line 49, in ?
    radius=Rspring, thickness=Dspring, color=(1,0.7,0.2))
  File "/usr/local/lib/python2.3/site-packages/visual/primitives.py", line 
190, in __init__
    pos_data[:,0] = xx
TypeError: Array can not be safely cast to required type


dipole.py works, but hangs when trying to close the window.


I am not sure what is common between the ones which work,
but I suspect some module which is built with the wrong compiler
(numeric?  Would that cause a failure like this?)


Maybe I will try rebuilding numeric with gcc33 and see what happens.
Thanks for your time.

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[Visualpython-users] questions about upgrade Mac OS to Panther

[Aaron T. <ti...@ma...>]

I just upgraded to Panther. I DID NOT do a clean install. However, I'm 
considering doing it again, but doing a clean install.

For getting a pristine installation of Fink and the latest 
Python/VPython, what do the Mac users on this list suggest?

Thanks,

Aaron

Re: [Visualpython-users] game in python

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

On Mon, 2004-05-17 at 11:26, Zbigniew wrote:

> Windows question:
> how to get rid of that black useless window
> behind visual display (also Tkinter).
> I know py2exe can generate non dos exe,
> but how to achieve that on script level?
> 
> regards
> 

Try using the pythonw.exe executable rather than python.exe.

HTH,
Jonathan Brandmeyer

Re: [Visualpython-users] game in python

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

> almost anything. This includes dealing with sound. In fact, I think the 
> creator of Python, Guido van Rossum, himself contributed to the sound 
> capabilities. I haven't used this machinery myself, though.
> In the Python documentation, see section 14 (multimedia) of the "Library 
> Reference" document.

yes. there is somekind of support for OSS
but this is system specific feature :(
I will look if something external exists.

when I am on subject of system specials:
label object can have font specified.
Names like Arial or Helvetica are
system specific.
Support for names known from CSS -- monospace,
serif, sans-serif would be interesting feature.

Windows question:
how to get rid of that black useless window
behind visual display (also Tkinter).
I know py2exe can generate non dos exe,
but how to achieve that on script level?

regards

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

Re: [Visualpython-users] game in python

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

I think the question below wasn't addressed by anyone, so I'll give it a 
shot. There is an extremely extensive set of modules for Python, to do 
almost anything. This includes dealing with sound. In fact, I think the 
creator of Python, Guido van Rossum, himself contributed to the sound 
capabilities. I haven't used this machinery myself, though.

In the Python documentation, see section 14 (multimedia) of the "Library 
Reference" document.

Bruce Sherwood

Zbigniew wrote:

> Other questions:
> 1. Is there chance for sound module for python?

Re: [Visualpython-users] game in python

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

On Sat, 2004-05-15 at 23:37, Andrew Williams wrote:
> On Sat, 15 May 2004 21:36:07 -0400, Bruce Sherwood wrote:
> 
> >I don't understand this syntax. If pos2 and pos1 are intended to stand 
> >for something like box1.pos and box2.pos, positions of VPython objects, 
> >then what you need is mag(pos2-pos1), not abs(pos2-pos1).
> >
> >> On Fri, 2004-05-14 at 09:28, Andrew Williams wrote:
> >>>
> >>>if abs(pos2 - pos1) < 0.01:
> >>>  handle_collision()
> 
> The 'abs' builtin does return the magnitude of a vector - I checked
> before posting the email.

This is undocumented behavior and should not be relied upon in the
future.


-Jonathan Brandmeyer

Re: [Visualpython-users] game in python

[Andrew W. <an...@ph...>]

On Sat, 15 May 2004 21:36:07 -0400, Bruce Sherwood wrote:

>I don't understand this syntax. If pos2 and pos1 are intended to stand 
>for something like box1.pos and box2.pos, positions of VPython objects, 
>then what you need is mag(pos2-pos1), not abs(pos2-pos1).
>
>> On Fri, 2004-05-14 at 09:28, Andrew Williams wrote:
>>>
>>>if abs(pos2 - pos1) < 0.01:
>>>  handle_collision()

The 'abs' builtin does return the magnitude of a vector - I checked
before posting the email. It doesn't work for tuples, only visual's
vector types. I'd actually forgotten about the 'mag' function, but I
assume that _would_ work for tuples, as it'd auto-convert them into
vectors like all the other visual functions.

Andrew

Re: [Visualpython-users] game in python

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

I don't understand this syntax. If pos2 and pos1 are intended to stand 
for something like box1.pos and box2.pos, positions of VPython objects, 
then what you need is mag(pos2-pos1), not abs(pos2-pos1).

Bruce Sherwood

Jonathan Brandmeyer wrote:

> On Fri, 2004-05-14 at 09:28, Andrew Williams wrote:
> 
>>On Fri, 14 May 2004 08:53:45 -0400, Jonathan Brandmeyer wrote:
>>
>>
>>>All vectors are always floating-point values in VPython.  If you need to
>>>truncate the precision to an integer type, you will probably need to
>>>write your own round-to-nearest conversion routine since Python only
>>>directly supports truncation of the decimal part.  See math.modf() for
>>>some help here.
>>
>>I'd have thought the 'round' builtin would do just that. It returns a
>>float, but rounded to the specified number of decimal places (if the
>>optional number of decimal places is omitted), so int(round(x)) should
>>always be the nearest integer. 
>>
>>Still, I'd test for collision by specifying a tolerance a bit more
>>explicitly - if pos2 and pos1 are both vectors, this is short and very
>>readable:
>>
>>if abs(pos2 - pos1) < 0.01:
>>  handle_collision()
>>
>>Andrew
> 
> 
> 
> Of course, a built-in function.  I was only looking in the math module. 
> Thanks for clearing this up.
> 
> -Jonathan Brandmeyer
> 
> 
> 
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Re: [Visualpython-users] game in python

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

On Fri, 2004-05-14 at 09:28, Andrew Williams wrote:
> On Fri, 14 May 2004 08:53:45 -0400, Jonathan Brandmeyer wrote:
> 
> >All vectors are always floating-point values in VPython.  If you need to
> >truncate the precision to an integer type, you will probably need to
> >write your own round-to-nearest conversion routine since Python only
> >directly supports truncation of the decimal part.  See math.modf() for
> >some help here.
> 
> I'd have thought the 'round' builtin would do just that. It returns a
> float, but rounded to the specified number of decimal places (if the
> optional number of decimal places is omitted), so int(round(x)) should
> always be the nearest integer. 
> 
> Still, I'd test for collision by specifying a tolerance a bit more
> explicitly - if pos2 and pos1 are both vectors, this is short and very
> readable:
> 
> if abs(pos2 - pos1) < 0.01:
>   handle_collision()
> 
> Andrew


Of course, a built-in function.  I was only looking in the math module. 
Thanks for clearing this up.

-Jonathan Brandmeyer

Re: [Visualpython-users] matrix module

[Andy D. <dou...@la...>]

On Fri, 14 May 2004, Bruce Sherwood wrote:

> There was a comment that the Matrix module isn't normally installed on
> machines running VPython. I don't think that's quite right. It is a
> component of Numeric and normally installs with it. Without doing
> anything special, it seems to be present on both my Windows and Linux
> machines. Maybe if you do something special when installing Numeric you
> can exclude it?

On a Debian system, Matrix.py is in a separate package such as
python2.3-numeric-ext that needs to be installed.  (I don't know why
offhand; it probably has to do with handling underlying library
dependencies.)  It is not installed by default, and Visual normally
works fine without it, so I hadn't noticed it was missing.

-- 
    Andy Dougherty		dou...@la...
    Dept. of Physics
    Lafayette College, Easton PA 18042

[Visualpython-users] matrix module

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

There was a comment that the Matrix module isn't normally installed on 
machines running VPython. I don't think that's quite right. It is a 
component of Numeric and normally installs with it. Without doing 
anything special, it seems to be present on both my Windows and Linux 
machines. Maybe if you do something special when installing Numeric you 
can exclude it?

Bruce Sherwood

Re: [Visualpython-users] game in python

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

> optional number of decimal places is omitted), so int(round(x)) should
> always be the nearest integer. 

that's it!
I didn't notice how exactly int() function does work.
Thank  you all for the effort and  please forgive me
the problems I had with describing the problem I had.

>if abs(pos2 - pos1) < 0.01:
>  handle_collision()

thats also very good

The fixed game should be there:
http://zeeball.w.interia.pl/bin/snake3d.tar.bz2

I have added in comments short description of
the game. Let me know if anyone managed
to play that game with or without this description:

#    there is 3D space with green box and flashing box
#    the green box is the food for the snake
#    and the flashing box is head of the snake
#    the snake is always moving in in Z direction
#    therefore to navigate the snake we have to rotate
#    the whole space with arrow keys till the snake
#    collides with food

Once again big thanks!

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

Re: [Visualpython-users] game in python

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

> All vectors are always floating-point values in VPython.  If you need to
> truncate the precision to an integer type, you will probably need to
> write your own round-to-nearest conversion routine since Python only
> directly supports truncation of the decimal part.  See math.modf() for
> some help here.

Yes! That was the reason. I even don't need the Matrix
module now.
I can give it as example for Vpython.
Let me know what to change in the "shape" of the code.

> VPython doesn't support anything in screen coordinates except for
> portions of the text object.  I'm doing some experiments with OpenGL
> textures that may yield fruit in this area, but its way too early to
> tell right now.

Nice to know.

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

Re: [Visualpython-users] game in python

[Andrew W. <an...@ph...>]

On Fri, 14 May 2004 08:53:45 -0400, Jonathan Brandmeyer wrote:

>All vectors are always floating-point values in VPython.  If you need to
>truncate the precision to an integer type, you will probably need to
>write your own round-to-nearest conversion routine since Python only
>directly supports truncation of the decimal part.  See math.modf() for
>some help here.

I'd have thought the 'round' builtin would do just that. It returns a
float, but rounded to the specified number of decimal places (if the
optional number of decimal places is omitted), so int(round(x)) should
always be the nearest integer. 

Still, I'd test for collision by specifying a tolerance a bit more
explicitly - if pos2 and pos1 are both vectors, this is short and very
readable:

if abs(pos2 - pos1) < 0.01:
  handle_collision()

Andrew

Re: [Visualpython-users] game in python

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

On Fri, 2004-05-14 at 06:04, Zbigniew wrote:

caveat, I haven't looked at any of your code.

> 3.
> The collision detection is done with
> the pos field. The rotations of the
> playfield are 90 degree (split in
> phases to animate).
> Pos coordinates of the boxes are used
> to detect collisions and should be
> integer numbers
> (I assumed that 90 degree rotations transform
> integer into integer).

This is probably not a valid assumption if you are using the built-in
rotate() function.

> I'm aware of the floats during roations therefore
> I do float->int conversion.
> I do it but sometimes the snake runs through
> the green box and collision is not detected.
> Code looks ok. Thats the major problem
> I cannot solve and I came here with.

All vectors are always floating-point values in VPython.  If you need to
truncate the precision to an integer type, you will probably need to
write your own round-to-nearest conversion routine since Python only
directly supports truncation of the decimal part.  See math.modf() for
some help here.

> 2. Is there chance for bitmap graphics support
>    (I imagine it as a layer on the top of the 3d display).
>    That would be also useful for teaching of the computer
>    graphics (drawing lines, filtering images etc.)

VPython doesn't support anything in screen coordinates except for
portions of the text object.  I'm doing some experiments with OpenGL
textures that may yield fruit in this area, but its way too early to
tell right now.

HTH,
Jonathan Brandmeyer