visualpython-users

[Visualpython-users] Problems with exception handling in vpython on Linux

[Guenter S. <Gue...@ph...>]

I ran into a number of problems with vpython on Linux which appear to be 
all related. The problems do not happen in Windows. My system is ubuntu 
9.04, vpython 5.12 compiled from source (5.11 gives identical results).

Thee common feature I see on Linux is, whenever vpython raises an 
exception, python seg. faults.

Example 1:

In [1]: from visual import *

In [2]: a = vector(1,2,3)

In [3]: for i in a:
    ...:     print i
    ...:
    ...:
1.0
2.0
3.0
Segmentation fault
~ $

but the following works:

Example 2:

In [1]: from visual import *

In [2]: a = vector(1,2,3)

In [3]: for i in a:
    ...:     print i
    ...:     if i>2:
    ...:         break
    ...:
    ...:
1.0
2.0
3.0

This seems to point to the raising a StopIteration exception as the 
problem point.

Example 3:
In [1]: from visual import *

In [2]: a = [1,2,3]

In [3]: mag2(a)
Out[3]: 14.0

In [4]: a = [1,2,'x']

In [5]: mag2(a)
Segmentation fault
~ $

It should have raised a TypeError as in this case

In [1]: from visual import *

In [2]: a = [1,2,'x']

In [3]: print a[0]*a[0]+a[1]*a[1]+a[2]*a[2]
------> print(a[0]*a[0]+a[1]*a[1]+a[2]*a[2])
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

Finally this fails as well:

Example 5:
In [1]: from visual import *

In [2]: quit()
Do you really want to exit ([y]/n)?
Segmentation fault
~ $

This error  is probably caused by a SystemExit exception.

Is something wrong with my install? Hard to see how to go wrong there, 
it's configure, make, make install and taking care of site-packages in 
ubuntu 9.04.

Thank you for your help and the great work.

Guenter Schneider

[Visualpython-users] Problem integrating VPython5 and PyQt4

[Matteo M. <mat...@it...>]

Dears,
I've a problem integrating VPython5 with PyQt4. If anyone can help me... 
thanks a lot!


Here is the problem:

The following code should show a PyQt4 form together with a VPython scene.
Using VPython3 it works correctly, while useing VPython5 it crashes.
Does anyone has experience on facing this problem?
I would be very grateful if anyone can help me.

from visual import *
from PyQt4 import QtCore, QtGui
import sys
 
class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QDialog.__init__(self)
 
scene.visible = 1
b = box()
 
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())


replacing

scene.visible = 1


with

scene.visible = 0


it works and the Qt window is shown also with VPython5 (but the scene 
can't be obviously seen!).

Thanks in advance
Matteo

-- 
-------------------------------------------------------
Matteo Malosio, Eng.
Researcher
ITIA-CNR (www.itia.cnr.it)
Institute of Industrial Technologies and Automation
National Research Council
via Bassini 15, 20133 MILANO, ITALY
Ph:  +39 0223699978
Fax: +39 0223699925
e-mail: mat...@it...
-------------------------------------------------------

Re: [Visualpython-users] Slow label update

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

Can you give a simple test routine that shows the problem with label? I'm not 
familiar with this problem.

The only text output in VPython is the label object. In visual.controls (see the 
example program controlstest.py) there are options that include simple menus 
(made from labels).

You might search the archives for this list, as various people in the past have 
talked about their own work on embedding VPython in larger environments.

Bruce Sherwood

nipun batra wrote:
> I saw videos on physics using VPython.I tried to use label to display 
> changing parameters,but it looks ugly at times when it's overwritten on 
> previous value.Moreover it makes a simple projectile program damn 
> slow.Any alternative?
> Can we use some text fields,areas ,menus here in VPython
> 

[Visualpython-users] Slow label update

[nipun b. <nip...@gm...>]

I saw videos on physics using VPython.I tried to use label to display
changing parameters,but it looks ugly at times when it's overwritten on
previous value.Moreover it makes a simple projectile program damn slow.Any
alternative?Can we use some text fields,areas ,menus here in VPython

Re: [Visualpython-users] W hen you create a gcurve, gdots, gvbars, or ghbars object, you can provide a list of points to be plotted, ....

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

Thanks for catching this! Yes, the documentation is indeed self-contradictory; 
only gdots accepts a list of points, but they all should; this is an oversight. 
It involves I think a pretty simple fix to graph.py -- just emulate for the 
other objects what's done for gdots.

Bruce Sherwood

Jon Schull wrote:
> The documentations seems to be self-contradictory (can a list be used 
> for all the g* objects or just the gdots object)?
> 
> 
>     When you create a gcurve, gdots, gvbars, or ghbars object, you can
>     provide a list of points to be plotted, just as is the case with the
>     ordinary curve object:
>     values = [(1,2), (3,4), (-5,2), (-5,-3)]
>     data = gdots(pos=values, color=color.blue)
>     /This list option is available only when creating the //gdots// object./
> 
> 
> I find it works with gdots but not with gcurve....
> 
> Jon Schull      sc...@di... <mailto:sc...@di...> 
>    cell: 585-738-6696
> Associate Professor         Rochester Institute of Technology
> 
> 
> 
> On Wed, Aug 26, 2009 at 5:24 PM, Bruce Sherwood <Bru...@nc... 
> <mailto:Bru...@nc...>> wrote:
> 
>     In the contributed section of vpython.org <http://vpython.org> is a
>     new povexport-2009-08-26.zip
>     package which lets you specify that a specific object to be exported
>     to POV-Ray
>     and ray-traced not only should not cast a shadow but also should not
>     make any
>     reflections in other objects. By specifying no_shadow=True and
>     no_reflection=True for an object you have the capability of making
>     an object be
>     "unreal" in the final raytraced image. A good example is a curve object
>     representing a trajectory of a moving object.
> 
>     Bruce Sherwood
> 
>     ------------------------------------------------------------------------------
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> 
> 

[Visualpython-users] Rotate

[nipun b. <nip...@gm...>]

I have just started with VPython and like it.I quickly need a simple working
example of rotation of a cube.Please help

[Visualpython-users] W hen you create a gcurve, gdots, gvbars, or ghbars object, you can provide a list of points to be plotted, ....

[Jon S. <js...@gm...>]

The documentations seems to be self-contradictory (can a list be used for
all the g* objects or just the gdots object)?


When you create a gcurve, gdots, gvbars, or ghbars object, you can provide a
list of points to be plotted, just as is the case with the ordinary curve
 object:
values = [(1,2), (3,4), (-5,2), (-5,-3)]
data = gdots(pos=values, color=color.blue)
*This list option is available only when creating the **gdots** object.*


I find it works with gdots but not with gcurve....

Jon Schull      sc...@di...    cell: 585-738-6696
Associate Professor         Rochester Institute of Technology



On Wed, Aug 26, 2009 at 5:24 PM, Bruce Sherwood <Bru...@nc...>wrote:

> In the contributed section of vpython.org is a new
> povexport-2009-08-26.zip
> package which lets you specify that a specific object to be exported to
> POV-Ray
> and ray-traced not only should not cast a shadow but also should not make
> any
> reflections in other objects. By specifying no_shadow=True and
> no_reflection=True for an object you have the capability of making an
> object be
> "unreal" in the final raytraced image. A good example is a curve object
> representing a trajectory of a moving object.
>
> Bruce Sherwood
>
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus
> on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Visualpython-users mailing list
> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>

[Visualpython-users] virtual cockpit+ flight simulator

[nipun b. <nip...@gm...>]

Hi,i wish to make an application to track a UAV in which i plan to do
following receive info  serially into a GUI(most probably i will use
pyGTK).Need something for moving map display,virtual cockpit and plane
simuation 3d.How good will Vpython be for the task.Can all this be
integrated in a single Vpython screen something like MS Flight
Simulator,menus etc also be added

[Visualpython-users] visual-5.12 download for linux not available

[Krishna S. R. <dks...@gm...>]

Hello,
The visual-5.12 tar file for Linux is not there. The page says

Not Found

The requested URL /contents/download/visual-5.12.tar.bz2 was not found on
this server.


Please fix!


Cheers,

Sandy

[Visualpython-users] New povexport

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

In the contributed section of vpython.org is a new povexport-2009-08-26.zip 
package which lets you specify that a specific object to be exported to POV-Ray 
and ray-traced not only should not cast a shadow but also should not make any 
reflections in other objects. By specifying no_shadow=True and 
no_reflection=True for an object you have the capability of making an object be 
"unreal" in the final raytraced image. A good example is a curve object 
representing a trajectory of a moving object.

Bruce Sherwood

Re: [Visualpython-users] controls slider not working in Win XP Tablet Edition

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

Let's hope that someone else has run across this problem, but it sounds 
completely unfamiliar. My own first thought was that it is necessary to update 
the graphics driver, but since you managed to get everything to function with 
your workaround, that doesn't seem likely.

There's nothing particularly special about sliders -- they just process mouse 
events. You might try narrowing the scope of the problem by playing with a copy 
of the module controls.py (in C:\Python26\Lib\site-packages\visual), inserting 
debugging print statements at critical points. And I would think you should see 
problems with any program that does mouse drags, such as the example program 
toroid_drag.py or colorsliders.py. The latter program has slider-like devices 
but doesn't import controls.

Bruce Sherwood

Parker Swanson wrote:
> Hello VPython community,
> 
> Maybe somebody can point me toward a solution to our problem: our College has acquired a number of HP EliteBook 2730p Tablet PC's with "Windows XP Tablet PC Edition 2005 Version 2002 Service Pack 3" installed. We want to use the machines to develop and run VPython programs. But I find that some of the objects in visual.controls don't work: for example, the slider. (This was observed with the supplied controlstest.py program as well as a program I wrote.)
> 
> As a temporary work-around, I found that if I install a virtualization platform such as VMWare Server 1.0.9 or VirtualBox, then build a Win XP Professional VM, and install Python 2.6.2 and VPython-Win-Py2.6-5.12.exe within the VM, VPython including the visual.controls objects (including the sliders) work just fine in the VM.
> 
> Question: Is there any published patch for Visual 5 which would allow all the controls to work in the Win XP Tablet OS? (Possibly if I have time I'll look into the source code myself...).
> 
> Thanks!
> par...@li... 
> 

[Visualpython-users] controls slider not working in Win XP Tablet Edition

[Parker S. <Par...@li...>]

Hello VPython community,

Maybe somebody can point me toward a solution to our problem: our College has acquired a number of HP EliteBook 2730p Tablet PC's with "Windows XP Tablet PC Edition 2005 Version 2002 Service Pack 3" installed. We want to use the machines to develop and run VPython programs. But I find that some of the objects in visual.controls don't work: for example, the slider. (This was observed with the supplied controlstest.py program as well as a program I wrote.)

As a temporary work-around, I found that if I install a virtualization platform such as VMWare Server 1.0.9 or VirtualBox, then build a Win XP Professional VM, and install Python 2.6.2 and VPython-Win-Py2.6-5.12.exe within the VM, VPython including the visual.controls objects (including the sliders) work just fine in the VM.

Question: Is there any published patch for Visual 5 which would allow all the controls to work in the Win XP Tablet OS? (Possibly if I have time I'll look into the source code myself...).

Thanks!
par...@li... 

[Visualpython-users] Visual 5.12

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

Visual 5.12 released for Windows (Python 2.6), Mac (Python 2.6, Intel, OSX 10.4 
and 10.5), and Linux.

As far as I can tell, you can install Visual 5.12 without uninstalling Visual 5.11.

New: frame_to_world and world_to_frame functions for converting between frame 
and "world" coordinates, stimulated by a suggestion of Robert Xiao. See the 
documentation on frames.

Fixes: bug in frame manipulations (pointed out by Robert Xiao), and a bug in 
helix that didn't permit creating additional attributes when creating a helix.

There are significant improvements to VIDLE thanks to Guilherme Polo working in 
a 2009 Google Summer of Code project, including the ability to edit and test 
without first having to save a file (you're warned about whether to save the 
file when you exit), and the shell window coming forward when there is an error, 
to alert you.

The VIDLE startup icon on the Mac (in /Applications/VPython) has been simplified 
and is probably more robust.

The attentive reader will note that I haven't built installers for Python 2.5 
nor PowerPC Macs, for which older installers are still available. Please let me 
know whether this is a problem, and/or whether you would be willing to take 
responsibility for building installers for these lesser-used configurations (I 
could teach you what's involved).

Bruce Sherwood

[Visualpython-users] VPython wiki reminder

[Korb, T. <jt...@pu...>]

As the semester gets started, here is a reminder that there is a VPython
wiki available as an alternative to post and share information about
VPython...

       http://vpython.wikidot.com
       
I set it up last fall in response to a request from Bruce Sherwood.  All
members of this list are welcome (and encouraged!) to join.  The site
includes a forum for posting questions and answers (including code
snippets), which could simplify and organize ongoing discussions.
Members can also create pages to post demonstration programs,
collaborate on projects and documentation, and develop ideas.

To join, visit...

	http://vpython.wikidot.com/system:join

After you have created your Wikidot account, you'll need this "secret
password" to become a member of the VPython site:
	
	vpython-user

If you forget the secret password, just submit a normal request to join
and I'll try to approve it promptly.

Tim Korb

Re: [Visualpython-users] Idle fixes starting up.

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

Now I find that this hall of mirrors is complete: Guilherme Polo tells 
me that the person who suggested to him that he approach David Scherer 
and me about including IDLE in his summer project was....Scott David 
Daniels!

Bruce Sherwood

Bruce Sherwood wrote:
> This is actually very humorous, as you'll see. For the benefit of those 
> who may not know about it, I'll comment that Google every year runs a 
> program called "Google Summer of Code" (GSoC) in which significant 
> open-source projects such as Python nominate students to work on 
> projects and Google pays the student. A mentor is assigned to the 
> student to give advice and follow progress.
> 
> One of this summer's Python projects was proposed by a Brazilian 
> student, Guilherme Polo, who had done good work in two previous GSoC 
> programs, and the project was accepted by the Python group. Polo 
> proposed doing a lot of maintenance and bug fixes on Tk and IDLE. His 
> mentor was....me! So yes, I do know about Polo's work, and I'm really 
> excited about it.
> 
> David Scherer and I had a wish list of IDLE fixes and changes which are 
> among the things Polo worked on. To give just one example: There are now 
> thousands of students every semester learning about computational 
> modeling in introductory university physics classes by writing VPython 
> programs (see http://www.matterandinteractions.org). These are novice 
> programmers. It is common for them to stare at a non-moving image 
> without it occurring to them that the halt could be due to a program 
> error. Polo has implemented that the shell window containing the error 
> comes forward to be seen, which should make a huge difference.
> 
> The GSoC is nearly at an end, and Polo is finishing up his work. The 
> presumption is that this will make it into the official IDLE for Python, 
> but in the meantime I'll change the temporary VIDLE to be the new 
> version. Hurray!
> 
> Bruce Sherwood
> 
> Scott David Daniels wrote:
>> Hey Bruce, did you notice gpolo's flurry of checkins on Idle?
>> It might be a good time to see what is still a bug, and what is not.
>>
>> A number of year-old and older issues got addressed.
>>
>> --Scott David Daniels
>> Sco...@Ac...
> 
> 
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day 
> trial. Simplify your report design, integration and deployment - and focus on 
> what you do best, core application coding. Discover what's new with 
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Visualpython-users mailing list
> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users

Re: [Visualpython-users] visualization of colors

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

Neither of you has it quite right. Kadir is correct that the problem is 
something to do with the graphics card or driver, because Marco was 
running a standard example (bounce.py), not writing a new program. 
Because I answered a personal note from Marco before I saw the same post 
by him in the list, I know that the issue isn't materials but any image 
whatsoever. He has a laptop, and probably he needs to update his 
graphics driver, or possibly his graphics card just doesn't support 
OpenGL properly.

Bruce Sherwood

Kadir Haldenbilen wrote:
> I believe Marco has a problem with materials setting.
> 
> It is highly likely that his display adapter does not support new 
> material types, so that they are all
> displayed dark blue.
> 
> Marco may need to switch materials off  in the sitesetings file at the 
> visual directory.
> 
> Kadir
> 
> ------------------------------------------------------------------------
> *From:* Scott David Daniels <Sco...@Ac...>
> *To:* vis...@li...
> *Sent:* Saturday, August 15, 2009 8:44:59 PM
> *Subject:* Re: [Visualpython-users] visualization of colors
> 
> marco bittelli wrote:
>  > I am starting to use Python and Visualpython. I am running the first 
> simple
>  > program with a 3D animation of a red ball bouncing on a blue floor. I
>  > installed
>  >
>  > Visual 5.11 released for Windows  and Python 2.6. The colors are not 
> showing
>  > well on the screen. For instance both the ball and the floor are dark 
> blue.
> 
> The human eye is not great with pure blue.  You could make it a paler
> blue by using a less monochrome color.  For example, you could simply go
> from a pure blue RGB (0.0, 0.0, 1.0) to increasing the "lightness" by
> adding a balanced amount of red and green (for example (.4, .4, 1.0)),
> or even pump up green since we are so good at seeing green: (.4, .6, 1).
> so, rather than "blue" in the demo, use one of these triples.
> 
> It may also be your lighting.  You could turn up the ambient some,
> (scene.ambient = .4, rather than the .2 default) for example, or add
> lights.  I think the default lighting has a "hole" from one direction,
> are you looking at the dark side of the demo?
> 
> to fiddle with all of this, do something simple:
>     import visual as vp
>     s = vp.sphere() # make a sphere (default color is white)
>     s.color = (.5, .6, .7) # try painting the sphere a new color
>     vp.scene.ambient # see ambient lighting (note it is colored light)
>     vp.scene.ambient = .4 # Set ambient to an intensity of white
>     t = vp.sphere(pos=(3,2,1), color=(1,.6,.4)) # create another sphere
> 
> --Scott David Daniels
> Sco...@Ac... <mailto:Sco...@Ac...>
> 
> 
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and 
> focus on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
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> Vis...@li... 
> <mailto:Vis...@li...>
> https://lists.sourceforge.net/lists/listinfo/visualpython-users
> 
> 
> ------------------------------------------------------------------------
> 
> ------------------------------------------------------------------------------
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> trial. Simplify your report design, integration and deployment - and focus on 
> what you do best, core application coding. Discover what's new with 
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
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> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users

Re: [Visualpython-users] Idle fixes starting up.

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

This is actually very humorous, as you'll see. For the benefit of those 
who may not know about it, I'll comment that Google every year runs a 
program called "Google Summer of Code" (GSoC) in which significant 
open-source projects such as Python nominate students to work on 
projects and Google pays the student. A mentor is assigned to the 
student to give advice and follow progress.

One of this summer's Python projects was proposed by a Brazilian 
student, Guilherme Polo, who had done good work in two previous GSoC 
programs, and the project was accepted by the Python group. Polo 
proposed doing a lot of maintenance and bug fixes on Tk and IDLE. His 
mentor was....me! So yes, I do know about Polo's work, and I'm really 
excited about it.

David Scherer and I had a wish list of IDLE fixes and changes which are 
among the things Polo worked on. To give just one example: There are now 
thousands of students every semester learning about computational 
modeling in introductory university physics classes by writing VPython 
programs (see http://www.matterandinteractions.org). These are novice 
programmers. It is common for them to stare at a non-moving image 
without it occurring to them that the halt could be due to a program 
error. Polo has implemented that the shell window containing the error 
comes forward to be seen, which should make a huge difference.

The GSoC is nearly at an end, and Polo is finishing up his work. The 
presumption is that this will make it into the official IDLE for Python, 
but in the meantime I'll change the temporary VIDLE to be the new 
version. Hurray!

Bruce Sherwood

Scott David Daniels wrote:
> Hey Bruce, did you notice gpolo's flurry of checkins on Idle?
> It might be a good time to see what is still a bug, and what is not.
> 
> A number of year-old and older issues got addressed.
> 
> --Scott David Daniels
> Sco...@Ac...

Re: [Visualpython-users] visualization of colors

[Kadir H. <kha...@ya...>]

I believe Marco has a problem with materials setting.

It is highly likely that his display adapter does not support new material types, so that they are all
displayed dark blue.

Marco may need to switch materials off  in the sitesetings file at the visual directory.

Kadir




________________________________
From: Scott David Daniels <Sco...@Ac...>
To: vis...@li...
Sent: Saturday, August 15, 2009 8:44:59 PM
Subject: Re: [Visualpython-users] visualization of colors

marco bittelli wrote:
> I am starting to use Python and Visualpython. I am running the first simple
> program with a 3D animation of a red ball bouncing on a blue floor. I
> installed 
> 
> Visual 5.11 released for Windows  and Python 2.6. The colors are not showing
> well on the screen. For instance both the ball and the floor are dark blue.

The human eye is not great with pure blue.  You could make it a paler
blue by using a less monochrome color.  For example, you could simply go
from a pure blue RGB (0.0, 0.0, 1.0) to increasing the "lightness" by
adding a balanced amount of red and green (for example (.4, .4, 1.0)),
or even pump up green since we are so good at seeing green: (.4, .6, 1).
so, rather than "blue" in the demo, use one of these triples.

It may also be your lighting.  You could turn up the ambient some, 
(scene.ambient = .4, rather than the .2 default) for example, or add
lights.  I think the default lighting has a "hole" from one direction,
are you looking at the dark side of the demo?

to fiddle with all of this, do something simple:
     import visual as vp
     s = vp.sphere() # make a sphere (default color is white)
     s.color = (.5, .6, .7) # try painting the sphere a new color
     vp.scene.ambient # see ambient lighting (note it is colored light)
     vp.scene.ambient = .4 # Set ambient to an intensity of white
     t = vp.sphere(pos=(3,2,1), color=(1,.6,.4)) # create another sphere

--Scott David Daniels
Sco...@Ac...


------------------------------------------------------------------------------
Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day 
trial. Simplify your report design, integration and deployment - and focus on 
what you do best, core application coding. Discover what's new with 
Crystal Reports now.  http://p.sf.net/sfu/bobj-july
_______________________________________________
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Vis...@li...
https://lists.sourceforge.net/lists/listinfo/visualpython-users



      

[Visualpython-users] Idle fixes starting up.

[Scott D. D. <Sco...@Ac...>]

Hey Bruce, did you notice gpolo's flurry of checkins on Idle?
It might be a good time to see what is still a bug, and what is not.

A number of year-old and older issues got addressed.

--Scott David Daniels
Sco...@Ac...

Re: [Visualpython-users] visualization of colors

[Scott D. D. <Sco...@Ac...>]

marco bittelli wrote:
> I am starting to use Python and Visualpython. I am running the first simple
> program with a 3D animation of a red ball bouncing on a blue floor. I
> installed 
> 
> Visual 5.11 released for Windows  and Python 2.6. The colors are not showing
> well on the screen. For instance both the ball and the floor are dark blue.

The human eye is not great with pure blue.  You could make it a paler
blue by using a less monochrome color.  For example, you could simply go
from a pure blue RGB (0.0, 0.0, 1.0) to increasing the "lightness" by
adding a balanced amount of red and green (for example (.4, .4, 1.0)),
or even pump up green since we are so good at seeing green: (.4, .6, 1).
so, rather than "blue" in the demo, use one of these triples.

It may also be your lighting.  You could turn up the ambient some, 
(scene.ambient = .4, rather than the .2 default) for example, or add
lights.  I think the default lighting has a "hole" from one direction,
are you looking at the dark side of the demo?

to fiddle with all of this, do something simple:
     import visual as vp
     s = vp.sphere() # make a sphere (default color is white)
     s.color = (.5, .6, .7) # try painting the sphere a new color
     vp.scene.ambient # see ambient lighting (note it is colored light)
     vp.scene.ambient = .4 # Set ambient to an intensity of white
     t = vp.sphere(pos=(3,2,1), color=(1,.6,.4)) # create another sphere

--Scott David Daniels
Sco...@Ac...

[Visualpython-users] visualization of colors

[marco b. <mar...@un...>]

Hello,

 

Hello, 

 

I am starting to use Python and Visualpython. I am running the first simple
program with a 3D animation of a red ball bouncing on a blue floor. I
installed 

Visual 5.11 released for Windows  and Python 2.6. The colors are not showing
well on the screen. For instance both the ball and the floor are dark blue.
Same thing with

other example programs using colored objects.

I am using Windows XP with 1280 x 800 pixels for the screen, 32 bit. Any
hints ??

 

Thanks for your great job !

 

Marco

 

 

 

Re: [Visualpython-users] [patch] materials.py texture path

[Robert X. <nne...@gm...>]

py2exe puts all the python files in a .zip file, and uses a special importer
to import modules contained in that zip. When materials.py uses __file__ to
search for the TGA files, it gets
"directory/library.zip/visual/materials.py", and since .zip files can't
actually be treated as directories by Python, it fails to find the files.

I've tested py2exe out on VPython. This one change is sufficient to allow
py2exe to produce a fully self-contained version of the Python program,
including the Python interpreter and all necessary libraries (visual, numpy,
core modules, etc.).

Robert

2009/8/12 Bruce Sherwood <Bru...@nc...>

>  What is it about py2exe that changes the directory structure, to move the
> .tga files away from the visual directory? Where does it put them (and why)?
> In my ignorance of py2exe, this fix of rummaging around in upper directories
> seems odd.
>
> Bruce Sherwood
>
> Robert Xiao wrote:
>
> As some people on this list have already noticed, materials.py searches for
> the texture .tga files in its own directory, which causes problems with
> packagers like py2exe.
>
> My solution to this is the following patch to materials.py, to allow it to
> search a few levels up from its own directory for these files:
>
> --- site-packages/visual/materials.py
> +++ site-packages/visual/materials.py
> @@ -147,10 +147,19 @@
>          image = image[::-1]
>      return image
>
> -texturePath = os.path.split( __file__ )[0] + "/"
> -data = loadTGA(texturePath+"turbulence3") # the targa file is 512*512*3
> -tx_turb3 = raw_texture( data=reshape(data,(64,64,64,3)), interpolate=True,
> mipmap=False )
> -tx_wood = raw_texture( data=loadTGA(texturePath+"wood"), interpolate=True)
> +curdir = os.path.dirname( __file__ )
> +for uplevel in range(4):
> +    try:
> +        uppath = os.path.sep.join([os.path.pardir]*uplevel)
> +        texturePath = os.path.normpath(os.path.join(curdir, uppath)) +
> os.path.sep
> +        data = loadTGA(texturePath+"turbulence3") # the targa file is
> 512*512*3
> +        tx_turb3 = raw_texture( data=reshape(data,(64,64,64,3)),
> interpolate=True, mipmap=False )
> +        tx_wood = raw_texture( data=loadTGA(texturePath+"wood"),
> interpolate=True)
> +    except IOError, OSError:
> +        if uplevel == 3:
> +            raise
> +        continue
> +    break
>
>  def get_default_channels(data):
>      dims = data.shape
>
> Now you can use a setup.py like the following for py2exe:
>
> ---8< code >8---
> #py2exe setup script
>
> from distutils.core import setup
> import py2exe
>
> # find visual's files
> import os.path as path
> from glob import glob
> import visual
>
> tgas = glob(path.join(path.dirname(visual.__file__), "*.tga"))
>
> setup(
>     # The first three parameters are not required, if at least a
>     # 'version' is given, then a versioninfo resource is built from
>     # them and added to the executables.
>     version = "1.0.0",
>     description = "Example Application",
>     name = "Example Application",
>
>     # targets to build
>     console = ["example.py"],
>
>     zipfile = "library.zip",
>     options={
>         "py2exe":{
>             "optimize": 2,
>             # Exclude some libraries which are non-essential.
>             # These are imported indirectly from numpy.
>             "excludes": ["doctest", "pydoc", "urllib2"],
>             "compressed": True,
>             "bundle_files": 1,
>             "ascii": True,
>         }
>     },
>
>     # VPython data files
>     data_files=[("",tgas)],
> )
> ---8< /code >8---
>
> In the above script, I excluded three libraries (doctest, pydoc, urllib2)
> as they were imported from numpy but are not necessary for the system to
> function. This decreases the size of the resulting bundle considerably.
>
> Robert
>
> ------------------------------
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
>
> ------------------------------
>
> _______________________________________________
> Visualpython-users mailing lis...@li...://lists.sourceforge.net/lists/listinfo/visualpython-users
>
>
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus
> on
> what you do best, core application coding. Discover what's new with
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> _______________________________________________
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> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>
>

Re: [Visualpython-users] [patch] materials.py texture path

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

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<html>
<head>
  <meta content="text/html;charset=UTF-8" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
What is it about py2exe that changes the directory structure, to move
the .tga files away from the visual directory? Where does it put them
(and why)? In my ignorance of py2exe, this fix of rummaging around in
upper directories seems odd.<br>
<br>
Bruce Sherwood<br>
<br>
Robert Xiao wrote:
<blockquote
 cite="mid:ef6...@ma..."
 type="cite">As some people on this list have already noticed,
materials.py searches for the texture .tga files in its own directory,
which causes problems with packagers like py2exe.<br>
  <br>
My solution to this is the following patch to materials.py, to allow it
to search a few levels up from its own directory for these files:<br>
  <br>
--- site-packages/visual/materials.py<br>
+++ site-packages/visual/materials.py<br>
@@ -147,10 +147,19 @@<br>
         image = image[::-1]<br>
     return image<br>
 <br>
-texturePath = os.path.split( __file__ )[0] + "/"<br>
-data = loadTGA(texturePath+"turbulence3") # the targa file is 512*512*3<br>
-tx_turb3 = raw_texture( data=reshape(data,(64,64,64,3)),
interpolate=True, mipmap=False )<br>
-tx_wood = raw_texture( data=loadTGA(texturePath+"wood"),
interpolate=True)<br>
+curdir = os.path.dirname( __file__ )<br>
+for uplevel in range(4):<br>
+    try:<br>
+        uppath = os.path.sep.join([os.path.pardir]*uplevel)<br>
+        texturePath = os.path.normpath(os.path.join(curdir, uppath)) +
os.path.sep<br>
+        data = loadTGA(texturePath+"turbulence3") # the targa file is
512*512*3<br>
+        tx_turb3 = raw_texture( data=reshape(data,(64,64,64,3)),
interpolate=True, mipmap=False )<br>
+        tx_wood = raw_texture( data=loadTGA(texturePath+"wood"),
interpolate=True)<br>
+    except IOError, OSError:<br>
+        if uplevel == 3:<br>
+            raise<br>
+        continue<br>
+    break<br>
 <br>
 def get_default_channels(data):<br>
     dims = data.shape<br>
  <br>
Now you can use a setup.py like the following for py2exe:<br>
  <br>
---8&lt; code &gt;8---<br>
#py2exe setup script<br>
  <br>
from distutils.core import setup<br>
import py2exe<br>
  <br>
# find visual's files<br>
import os.path as path<br>
from glob import glob<br>
import visual<br>
  <br>
tgas = glob(path.join(path.dirname(visual.__file__), "*.tga"))<br>
  <br>
setup(<br>
    # The first three parameters are not required, if at least a<br>
    # 'version' is given, then a versioninfo resource is built from<br>
    # them and added to the executables.<br>
    version = "1.0.0",<br>
    description = "Example Application",<br>
    name = "Example Application",<br>
  <br>
    # targets to build<br>
    console = ["example.py"],<br>
  <br>
    zipfile = "library.zip",<br>
    options={<br>
        "py2exe":{<br>
            "optimize": 2,<br>
            # Exclude some libraries which are non-essential.<br>
            # These are imported indirectly from numpy.<br>
            "excludes": ["doctest", "pydoc", "urllib2"],<br>
            "compressed": True,<br>
            "bundle_files": 1,<br>
            "ascii": True,<br>
        }<br>
    },<br>
  <br>
    # VPython data files<br>
    data_files=[("",tgas)],<br>
)<br>
---8&lt; /code &gt;8---<br>
  <br>
In the above script, I excluded three libraries (doctest, pydoc,
urllib2) as they were imported from numpy but are not necessary for the
system to function. This decreases the size of the resulting bundle
considerably.<br>
  <br>
Robert<br>
  <pre wrap="">
<hr size="4" width="90%">
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Re: [Visualpython-users] Arbitrary frame transformation routine

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

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</head>
<body bgcolor="#ffffff" text="#000000">
This looks like a candidate for inclusion in Visual. Thanks.<br>
<br>
Bruce Sherwood<br>
<br>
Robert Xiao wrote:
<blockquote
 cite="mid:ef6...@ma..."
 type="cite">I wrote a small frame wrapper class to add these sorts of
transformations in a program I developed:<br>
  <br>
class Frame(frame):<br>
    def world_axes(self):<br>
        x_axis = norm(self.axis)<br>
        z_axis = norm(self.axis.cross(self.up))<br>
        y_axis = norm(z_axis.cross(x_axis))<br>
        return (x_axis, y_axis, z_axis)<br>
  <br>
    def world_offset(self, pos):<br>
        x,y,z = self.world_axes()<br>
        return pos.x*x + pos.y*y + pos.z*z<br>
  <br>
    def world_pos(self, pos):<br>
        return self.pos + self.world_offset(pos)<br>
  <br>
    def frame_offset(self, pos):<br>
        x,y,z = self.world_axes()<br>
        return vector(pos.dot(x), pos.dot(y), pos.dot(z))<br>
  <br>
    def frame_pos(self, pos):<br>
        return self.frame_offset(pos - self.pos)<br>
  <br>
world_pos is the frame-&gt;world transformation; frame_pos is the
world-&gt;frame transformation.<br>
  <br>
Robert<br>
  <pre wrap="">
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[Visualpython-users] [patch] materials.py texture path

[Robert X. <nne...@gm...>]

As some people on this list have already noticed, materials.py searches for
the texture .tga files in its own directory, which causes problems with
packagers like py2exe.

My solution to this is the following patch to materials.py, to allow it to
search a few levels up from its own directory for these files:

--- site-packages/visual/materials.py
+++ site-packages/visual/materials.py
@@ -147,10 +147,19 @@
         image = image[::-1]
     return image

-texturePath = os.path.split( __file__ )[0] + "/"
-data = loadTGA(texturePath+"turbulence3") # the targa file is 512*512*3
-tx_turb3 = raw_texture( data=reshape(data,(64,64,64,3)), interpolate=True,
mipmap=False )
-tx_wood = raw_texture( data=loadTGA(texturePath+"wood"), interpolate=True)
+curdir = os.path.dirname( __file__ )
+for uplevel in range(4):
+    try:
+        uppath = os.path.sep.join([os.path.pardir]*uplevel)
+        texturePath = os.path.normpath(os.path.join(curdir, uppath)) +
os.path.sep
+        data = loadTGA(texturePath+"turbulence3") # the targa file is
512*512*3
+        tx_turb3 = raw_texture( data=reshape(data,(64,64,64,3)),
interpolate=True, mipmap=False )
+        tx_wood = raw_texture( data=loadTGA(texturePath+"wood"),
interpolate=True)
+    except IOError, OSError:
+        if uplevel == 3:
+            raise
+        continue
+    break

 def get_default_channels(data):
     dims = data.shape

Now you can use a setup.py like the following for py2exe:

---8< code >8---
#py2exe setup script

from distutils.core import setup
import py2exe

# find visual's files
import os.path as path
from glob import glob
import visual

tgas = glob(path.join(path.dirname(visual.__file__), "*.tga"))

setup(
    # The first three parameters are not required, if at least a
    # 'version' is given, then a versioninfo resource is built from
    # them and added to the executables.
    version = "1.0.0",
    description = "Example Application",
    name = "Example Application",

    # targets to build
    console = ["example.py"],

    zipfile = "library.zip",
    options={
        "py2exe":{
            "optimize": 2,
            # Exclude some libraries which are non-essential.
            # These are imported indirectly from numpy.
            "excludes": ["doctest", "pydoc", "urllib2"],
            "compressed": True,
            "bundle_files": 1,
            "ascii": True,
        }
    },

    # VPython data files
    data_files=[("",tgas)],
)
---8< /code >8---

In the above script, I excluded three libraries (doctest, pydoc, urllib2) as
they were imported from numpy but are not necessary for the system to
function. This decreases the size of the resulting bundle considerably.

Robert