visualpython-users

Re: [Visualpython-users] Intersection Calculations

[Peter B. <p.h...@bh...>]

Dear Daniel
 
I do not understand what it is you want to do.
 
Perhaps vpython is not the right package. Have you looked at Geogebra?
 
Regards
 
Peter
 
P.H...@bh...
 
+44 (0) 121 475 3029

________________________________

From: Daniel [mailto:boy...@gm...]
Sent: Mon 30-Nov-09 11:55 PM
To: vis...@li...
Subject: [Visualpython-users] Intersection Calculations



Hi folks,

Is it possible to use vpython to compute intersections with simple 
geometrical objects such has rays and planes? Could you point me in 
the right direction.

Best regards,

Daniel

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[Visualpython-users] Intersection Calculations

[Daniel <boy...@gm...>]

Hi folks,

Is it possible to use vpython to compute intersections with simple  
geometrical objects such has rays and planes? Could you point me in  
the right direction.

Best regards,

Daniel

Re: [Visualpython-users] pylab

[Chris C. <scc...@gm...>]

On Sat, Nov 28, 2009 at 6:56 PM, Gary Pajer <gar...@gm...> wrote:
> PyLab is new to me, but I am familiar with pylab (matplotlib sub).  I also
> strongly suspect that matplotlib is what you want.  You don't say what
> platform you are on, but matplotlib is included in the Ubuntu installation
> repository.  I've found the easiest way to install matplotlib on WinXP is
> using the stand-alone installer on their website.   I think they offer an
> "easy_install" option, but I've gotten tied up in knots with that from time
> to time.
>
> Now, since Bruce brought it up ...
>
> One problem with "from pylab import *" is that matplotlib overwrites some
> numpy functions, for example linspace().   I don't know why or how that
> happened, but the two functions behave differently.  People probably expect
> the numpy behavior,   but unexpectedly get the matplotlib behavior.
>
> Perhaps PyLab does away with this conflict.  I don't know.
>
That is incorrect:

In [1]: import pylab as pl

In [2]: pl.linspace
Out[2]: <function linspace at 0x2763c80>

In [3]: import numpy as np

In [4]: np.linspace
Out[4]: <function linspace at 0x2763c80>

They are the same function.


>
>
> On Thu, Nov 19, 2009 at 4:10 PM, Bruce Sherwood <Bru...@nc...>
> wrote:
>>
>> After a bit of googling, the situation seems to be this:
>>
>> matplotlib (http://matplotlib.sourceforge.net) is a Python 2d plotting
>> library
>> which includes a module named pylab. I'm guessing that's what you're
>> looking for.
>>
>> A confusing factor is that at http://www.scipy.org/PyLab there is a
>> discussion
>> that starts out with this:
>>
>> See the following post for further discussion of the difference between
>> the
>> vision for a new PyLab expressed on this page, and the existing pylab
>> package
>> which is part of matplotlib:
>> http://www.nabble.com/pylab-td24910613.html
>>
>> Incidentally, the www.scipy.org/PyLab discussion makes a case for a new
>> pylab to
>> be invoked as "from pylab import *" which would import a bunch of stuff
>> almost
>> anyone doing scientific processing will need (including numpy and scipy),
>> rather
>> like the current situation with Visual. The essayist then says, foreseeing
>> objections, "But there are so many names! Not really. from scipy import *
>> brings
>> in about 20 subpackages (i.e. signal such that you still need to do
>> signal.ifft,
>> but not scipy.signal.ifft) and only 15 new symbols."
>>
>> Bruce Sherwood
>>
>> marco bittelli wrote:
>> > I am trying to install pylab for python 2.6, but I have problem finding
>> > the package (even in the main Python website).
>> >
>> >
>> >
>> > Could you help me ?
>> >
>> >
>> >
>> > Marco
>> >
>> >
>> >
>> > Marco Bittelli, Ph.D.
>> >
>> > Department of Agro-Environmental Science and Technology
>> >
>> > University of Bologna, Italy
>> >
>> > Viale Fanin, 44.
>> >
>> > 40125, Bologna, Italy
>> >
>> > email:mar...@un...
>> >
>> > http://www.dista.unibo.it/~bittelli
>>
>>
>> ------------------------------------------------------------------------------
>> 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
>
>
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> on
> what you do best, core application coding. Discover what's new with
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>
>

Re: [Visualpython-users] pylab

[Michele M. <mat...@gm...>]

To use pylab properly in a program you should use the object oriented way:

import numpy as np
import scipy as sp
import matplotlib.pyplot as plt

then use them accordingly to your need.

The quick use of the console interface a la matlab to try thing can be done
using ipython, but should be used only on a try and errors scheme.
Some example here:
http://www.slideshare.net/mattions/scipy-numpy-and-friends

Cheers,
Michele


On Sat, Nov 28, 2009 at 5:56 PM, Gary Pajer <gar...@gm...> wrote:

> PyLab is new to me, but I am familiar with pylab (matplotlib sub).  I also
> strongly suspect that matplotlib is what you want.  You don't say what
> platform you are on, but matplotlib is included in the Ubuntu installation
> repository.  I've found the easiest way to install matplotlib on WinXP is
> using the stand-alone installer on their website.   I think they offer an
> "easy_install" option, but I've gotten tied up in knots with that from time
> to time.
>
> Now, since Bruce brought it up ...
>
> One problem with "from pylab import *" is that matplotlib overwrites some
> numpy functions, for example linspace().   I don't know why or how that
> happened, but the two functions behave differently.  People probably expect
> the numpy behavior,   but unexpectedly get the matplotlib behavior.
>
> Perhaps PyLab does away with this conflict.  I don't know.
>
>
>
>
> On Thu, Nov 19, 2009 at 4:10 PM, Bruce Sherwood <Bru...@nc...>wrote:
>
>> After a bit of googling, the situation seems to be this:
>>
>> matplotlib (http://matplotlib.sourceforge.net) is a Python 2d plotting
>> library
>> which includes a module named pylab. I'm guessing that's what you're
>> looking for.
>>
>> A confusing factor is that at http://www.scipy.org/PyLab there is a
>> discussion
>> that starts out with this:
>>
>> See the following post for further discussion of the difference between
>> the
>> vision for a new PyLab expressed on this page, and the existing pylab
>> package
>> which is part of matplotlib:
>> http://www.nabble.com/pylab-td24910613.html
>>
>> Incidentally, the www.scipy.org/PyLab discussion makes a case for a new
>> pylab to
>> be invoked as "from pylab import *" which would import a bunch of stuff
>> almost
>> anyone doing scientific processing will need (including numpy and scipy),
>> rather
>> like the current situation with Visual. The essayist then says, foreseeing
>> objections, "But there are so many names! Not really. from scipy import *
>> brings
>> in about 20 subpackages (i.e. signal such that you still need to do
>> signal.ifft,
>> but not scipy.signal.ifft) and only 15 new symbols."
>>
>> Bruce Sherwood
>>
>> marco bittelli wrote:
>> > I am trying to install pylab for python 2.6, but I have problem finding
>> > the package (even in the main Python website).
>> >
>> >
>> >
>> > Could you help me ?
>> >
>> >
>> >
>> > Marco
>> >
>> >
>> >
>> > Marco Bittelli, Ph.D.
>> >
>> > Department of Agro-Environmental Science and Technology
>> >
>> > University of Bologna, Italy
>> >
>> > Viale Fanin, 44.
>> >
>> > 40125, Bologna, Italy
>> >
>> > email:mar...@un... <email%3Am...@un...>
>> >
>> > http://www.dista.unibo.it/~bittelli<http://www.dista.unibo.it/%7Ebittelli>
>>
>>
>> ------------------------------------------------------------------------------
>> 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
>>
>
>
>
> ------------------------------------------------------------------------------
> 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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> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>
>

Re: [Visualpython-users] pylab

[Gary P. <gar...@gm...>]

PyLab is new to me, but I am familiar with pylab (matplotlib sub).  I also
strongly suspect that matplotlib is what you want.  You don't say what
platform you are on, but matplotlib is included in the Ubuntu installation
repository.  I've found the easiest way to install matplotlib on WinXP is
using the stand-alone installer on their website.   I think they offer an
"easy_install" option, but I've gotten tied up in knots with that from time
to time.

Now, since Bruce brought it up ...

One problem with "from pylab import *" is that matplotlib overwrites some
numpy functions, for example linspace().   I don't know why or how that
happened, but the two functions behave differently.  People probably expect
the numpy behavior,   but unexpectedly get the matplotlib behavior.

Perhaps PyLab does away with this conflict.  I don't know.



On Thu, Nov 19, 2009 at 4:10 PM, Bruce Sherwood <Bru...@nc...>wrote:

> After a bit of googling, the situation seems to be this:
>
> matplotlib (http://matplotlib.sourceforge.net) is a Python 2d plotting
> library
> which includes a module named pylab. I'm guessing that's what you're
> looking for.
>
> A confusing factor is that at http://www.scipy.org/PyLab there is a
> discussion
> that starts out with this:
>
> See the following post for further discussion of the difference between the
> vision for a new PyLab expressed on this page, and the existing pylab
> package
> which is part of matplotlib:
> http://www.nabble.com/pylab-td24910613.html
>
> Incidentally, the www.scipy.org/PyLab discussion makes a case for a new
> pylab to
> be invoked as "from pylab import *" which would import a bunch of stuff
> almost
> anyone doing scientific processing will need (including numpy and scipy),
> rather
> like the current situation with Visual. The essayist then says, foreseeing
> objections, "But there are so many names! Not really. from scipy import *
> brings
> in about 20 subpackages (i.e. signal such that you still need to do
> signal.ifft,
> but not scipy.signal.ifft) and only 15 new symbols."
>
> Bruce Sherwood
>
> marco bittelli wrote:
> > I am trying to install pylab for python 2.6, but I have problem finding
> > the package (even in the main Python website).
> >
> >
> >
> > Could you help me ?
> >
> >
> >
> > Marco
> >
> >
> >
> > Marco Bittelli, Ph.D.
> >
> > Department of Agro-Environmental Science and Technology
> >
> > University of Bologna, Italy
> >
> > Viale Fanin, 44.
> >
> > 40125, Bologna, Italy
> >
> > email:mar...@un... <email%3Am...@un...>
> >
> > http://www.dista.unibo.it/~bittelli<http://www.dista.unibo.it/%7Ebittelli>
>
>
> ------------------------------------------------------------------------------
> 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] various projectile motion examples

[Symion <kn...@ip...>]

Lenore Horner wrote:
> I've made some vpython simulations of varying degrees of 
> sophistication.  If you are interested, you can find them here 
> <http://www.siue.edu/%7Elhorner/VPython/VPython.html>.  Bruce,  I 
> don't know how things get into the contributed programs, but if you 
> think any are worthy, you are welcome to post them there.
>
> Iterative set of simulations looking at falling drops without and then 
> with air resistance.
>
> A simulation with extensive user controls for air resistance in 
> projectile motion.  Thank you, Bruce, for your help with this.  This 
> requires the posted modified controls module.
>
> A simulation of Newton's cannon with too small a velocity in 
> comparison to falling-through-the-center-of-the-Earth in once case 
> assuming all Earth's mass is at the center and in the other assuming a 
> uniform density for the Earth.  (All of this assumes a spherical Earth.)
>
> Lenore Horner
> physics
> SIUE
>
Hi there Lenore,
    Nice to see some open source programs being shared around.
Just a slight problem with a link in your web page force drops to 
separate vpython source 
<http://www.siue.edu/%7Elhorner/VPython/drops-falling-through-air/drops-splat.py> 
has the following extraneous info attached.
 
%7Elhorner/VPython/drops-falling-through-air/drops-splat.py%3Eair%20resistance%20plus%20going%20splat%3C/a%3E%3Cp%3EIf%20you%20run%20a%20few%20of%20the%20last%20two%20simulations,%20you%20will%20see%20things%20behaving%20more%20like%20soap%20bubbles%20than%20any%20ball%20or%20rain%20drop%20I%20ever%20saw.%20%20That%20is%20fixed%20here.%3C/p%3E%3Ca%20href=

Symion

[Visualpython-users] various projectile motion examples

[Lenore H. <lh...@si...>]

I've made some vpython simulations of varying degrees of  
sophistication.  If you are interested, you can find them here.   
Bruce,  I don't know how things get into the contributed programs, but  
if you think any are worthy, you are welcome to post them there.

Iterative set of simulations looking at falling drops without and then  
with air resistance.

A simulation with extensive user controls for air resistance in  
projectile motion.  Thank you, Bruce, for your help with this.  This  
requires the posted modified controls module.

A simulation of Newton's cannon with too small a velocity in  
comparison to falling-through-the-center-of-the-Earth in once case  
assuming all Earth's mass is at the center and in the other assuming a  
uniform density for the Earth.  (All of this assumes a spherical Earth.)

Lenore Horner
physics
SIUE

Re: [Visualpython-users] 200,000 point objects

[Symion <kn...@ip...>]

Hi there,
    I have made a few modifications to the original.
I have included the show_rendertime=True and combined the star and 
magnetic field objects.
They all add up to 200,000 points + two circles and two spheres.
Source: Shell_5.py <http://home.iprimus.com.au/knoware/webpage/Shell_5.py>

I get cycle: 2445 render: 342 on my ASUS laptop.


Bruce Sherwood wrote:
> Interesting. On a Del XPS M1330 laptop with NVIDIA 8400M GS graphics 
> performance is pretty good, with decent rotate and zoom. When I set 
> scene.show_rendertime = True, I get this report:
>
> cycle: 200 render: 50
>
> This means that it takes 50 ms to render the scene, and there are 200 ms 
> between renders. This behavior is a bit strange, in that Visual attempts 
> to balance computation and rendering, so with a render time of 50 ms I 
> would have expected a cycle time of 100 ms (50 ms computation, 50 ms 
> render).
>
> Bruce Sherwood
>
> Symion wrote:
>   
>> Hi there,
>>     Here is another program dealing with large numbers of objects 
>> (200,000 points)!
>>
>> Source: Shell_2.py <http://home.iprimus.com.au/knoware/webpage/Shell_2.py>
>>
>> This is a Stellar Anatomy type demonstration.
>>
>> Symion
>>     
>
> ------------------------------------------------------------------------------
> 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] 200,000 point objects

[Symion <kn...@ip...>]

Bruce Sherwood wrote:
> Interesting. On a Del XPS M1330 laptop with NVIDIA 8400M GS graphics 
> performance is pretty good, with decent rotate and zoom. When I set 
> scene.show_rendertime = True, I get this report:
>
> cycle: 200 render: 50
>
> This means that it takes 50 ms to render the scene, and there are 200 ms 
> between renders. This behavior is a bit strange, in that Visual attempts 
> to balance computation and rendering, so with a render time of 50 ms I 
> would have expected a cycle time of 100 ms (50 ms computation, 50 ms 
> render).
>
> Bruce Sherwood
>
> Symion wrote:
>   
>> Hi there,
>>     Here is another program dealing with large numbers of objects 
>> (200,000 points)!
>>
>> Source: Shell_2.py <http://home.iprimus.com.au/knoware/webpage/Shell_2.py>
>>
>> This is a Stellar Anatomy type demonstration.
>>
>> Symion
>>     
>
> ------------------------------------------------------------------------------
> 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
>
>   

Hi there,
    I have found that by carefully selecting rate(x), the response 
performance can be improved.
A faster response can be achieved by changing self.type=1, this selects 
the square shape for points instead of round.
However if you change self.size=1 then each point size depends on the 
reciprocal of the distance from the center,
that really slows things down, but gives a very pleasing globular effect.

I'm left wondering what else I can use it for? Maybe a Brownian motion 
generator to get the whole thing boiling!

Re: [Visualpython-users] 200,000 point objects

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

Interesting. On a Del XPS M1330 laptop with NVIDIA 8400M GS graphics 
performance is pretty good, with decent rotate and zoom. When I set 
scene.show_rendertime = True, I get this report:

cycle: 200 render: 50

This means that it takes 50 ms to render the scene, and there are 200 ms 
between renders. This behavior is a bit strange, in that Visual attempts 
to balance computation and rendering, so with a render time of 50 ms I 
would have expected a cycle time of 100 ms (50 ms computation, 50 ms 
render).

Bruce Sherwood

Symion wrote:
> Hi there,
>     Here is another program dealing with large numbers of objects 
> (200,000 points)!
> 
> Source: Shell_2.py <http://home.iprimus.com.au/knoware/webpage/Shell_2.py>
> 
> This is a Stellar Anatomy type demonstration.
> 
> Symion

Re: [Visualpython-users] Help about frame in frame world position

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

Here is an example:

from visual import *
f = frame(pos=(2,1,0))
b = box(frame=f, pos=(-3,1,1), size=(.2,.2,.2))
print b.pos
print f.frame_to_world(b.pos)
print f.world_to_frame(vector(2,1,0))

This yields

<-3, 1, 1>
<-1, 2, 1>
<0, 0, 0>

Bruce Sherwood

ale ale wrote:
> Hi
> 
> I need help to determine the position of an object that is part of a 
> frame and I don't really understand how to use  
> *
>  world_pos = f.frame_to_world (frame_pos) *
>  
> found in online documentation and I'm looking for some examples
> 
> I use a class to define the frame that is composed by a main frame that 
> contains two frames composed by many objects.
> The object ( a servo)  is composed by two parts (servo_box and 
> servo_frame), I can turn the servo_frame arround its axis , but I need 
> to connect two servo  to create a joint like hip, knee ....
> Could you show me some examples or documentation that I can study to 
> better understand how to calculate the points I need?
> 
> 
> AleAle99
> 
> 
> 
> code like this:
> 
> class ServoWithFrame():   
> 
>     def __init__ (self,offset=(0,0,0)):
>        
>         self.servo =frame(pos=offset)
>               
>         self.servo_box =frame(frame=self.servo)
>         self.servo_asse =frame(frame=self.servo)
> 
>         self.main_box =box(frame=self.servo_box, 
> pos=(offset),axis=(self.servo_box.lenght,0,0), height = 
> self.servo_box.height, width 
> =self.servo_box.width,color=(0.4,0.4,0.4),material=materials.plastic)
>         self.secondary_box= box(frame=self.servo_box, 
> pos=((self.main_box.x -(self.servo_box.lenght 
> -self.servo_box.lenghtb)/2. ),(self.main_box.y+ 
> self.servo_box.heightb/2.+self.servo_box.height/2.),self.main_box.z 
> ),axis=(self.servo_box.lenghtb,0,0), height = self.servo_box.heightb, 
> width =self.servo_box.width,color=(0.4,0.4,0.4),material=materials.plastic)
>         self.motor_cyl= cylinder (frame=self.servo_box, 
> pos=((self.main_box.x + self.servo_box.lenghtb/2. - self.servo_box.motor 
> ),(self.main_box.y -self.servo_box.height -self.servo_box.heightb/2.+1.5 
> ),self.main_box.z ), axis=(0,self.servo_box.motor,0), radius 
> =self.servo_box.width/2.,color=(0.4,0.4,0.4),material=materials.plastic)
>         self.motor_main= cylinder (frame=self.servo_asse, 
> pos=((self.main_box.x - self.servo_box.lenght/2. + 
> self.servo_box.width/2.  ),(self.main_box.y -self.servo_box.height/2 - 
> self.servo_box.attacw),self.main_box.z ), 
> axis=(0,self.servo_box.attacl,0), radius =self.servo_box.attacw/2., 
> color=(0.9,0.9,0.95),material=materials.plastic)
>         self.motor_cylb= cylinder (frame=self.servo_box, 
> pos=(self.motor_main.x ,self.motor_main.y+ self.servo_box.height+ 
> self.servo_box.heightb+4.5,self.motor_main.z ), axis=(0,2,0), radius 
> =self.servo_box.motor/2.,color=(0.4,0.4,0.4),material=materials.plastic)
>    
>         self.servo_frame =frame(frame=self.servo)
>         self.left_circle = cylinder (frame=self.servo_frame, pos = 
> self.motor_cylb.pos,radius =self.servo_frame.width/2., 
> lenght=self.servo_frame.thick,material=materials.rough)
>         self.left_box =box(frame=self.servo_frame, 
> pos=(self.left_circle.x+0.5,self.left_circle.y 
> -(self.servo_frame.width/2. -1) , self.left_circle.z), height = 
> self.servo_frame.height-self.servo_frame.width/2., width 
> =self.servo_frame.width, 
> lenght=self.servo_frame.thick,material=materials.rough)
>         self.right_circle = cylinder (frame=self.servo_frame, 
> pos=(self.left_circle.x + self.servo_frame.lenght - 
> self.servo_frame.thick,self.left_circle.y,self.left_circle.z), radius 
> =self.servo_frame.width/2., 
> lenght=self.servo_frame.thick,material=materials.rough)
>         self.right_box =box(frame=self.servo_frame, 
> pos=(self.right_circle.x+0.5,self.right_circle.y-(self.servo_frame.width/2. 
> -1) , self.right_circle.z), height = 
> self.servo_frame.height-self.servo_frame.width/2., width 
> =self.servo_frame.width, 
> lenght=self.servo_frame.thick,material=materials.rough)
>        
>         self.low_box = box(frame=self.servo_frame, 
> pos=(self.left_circle.x+self.servo_frame.lenght/2.,self.left_circle.y-self.servo_frame.width/2. 
> - (self.servo_frame.height-self.servo_frame.width) - 
> self.servo_frame.thick 
> ,self.left_circle.z),axis=(self.servo_frame.lenght,0,0),  height = 1, 
> width =self.servo_frame.width,material=materials.rough)
>         self.side_dx = box(frame=self.servo_frame, pos=(self.low_box.x 
> -self.servo_frame.thick/2. 
> ,self.low_box.y+1,self.low_box.z+self.servo_frame.width/2),axis=(self.servo_frame.lenght-4*self.servo_frame.thick,0,0),  
> height = 3, width =self.servo_frame.thick,material=materials.rough)
>         self.side_sx = box(frame=self.servo_frame, pos=(self.low_box.x 
> -self.servo_frame.thick/2. 
> ,self.low_box.y+1,self.low_box.z-self.servo_frame.width/2),axis=(self.servo_frame.lenght-4*self.servo_frame.thick,0,0),  
> height = 3, width =self.servo_frame.thick,material=materials.rough)
> 
> 
> ------------------------------------------------------------------------
> 
> ------------------------------------------------------------------------------
> 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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Re: [Visualpython-users] help on cvisualmodule.la

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

But please edit the file to delete repetitious compile actions; 
otherwise the file will be too large.

The message you received indicates that you were able to compile all the 
C++ files but that some needed libraries are not installed, so that the 
linking loader could not complete the creation of the binary.

Bruce Sherwood

TH Chew wrote:
> Hi,
> 
> I suggest you to look at the "build.log" under the folder "src". And 
> maybe you can post your "build.log" here and see.
> 
> On Wed, Nov 25, 2009 at 2:15 AM, Ramakrishnan <nr...@gm... 
> <mailto:nr...@gm...>> wrote:
> 
>     I am trying to install vpython on a FC11. I am getting the usual
>     cvisualmodule.lo  and I had forgotten the work around for this.
>     Please let me know how to get around this. The relevant part
>     of my make is as follows
> 
>     Making all in src
>     make[1]: Entering directory `/usr/local/visual-5.13_release/src'
>     Compiling ./python/cvisualmodule.cpp ...
>     make[1]: *** [cvisualmodule.lo] Error 1
>     make[1]: Leaving directory `/usr/local/visual-5.13_release/src'
>     make: *** [all-recursive] Error 1
> 
> 
>     Thanks in advance
> 
>     Cheers
>     Ram
> 
>     -- 
>     Ramakrishnan N.
>     Complex Fluids and Biophysics Group
>     Department of Physics
>     IIT Madras
> 
>     Success has thousand fathers while failure is an orphan  :-)
> 
>     ------------------------------------------------------------------------------
>     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...
>     <mailto:Vis...@li...>
>     https://lists.sourceforge.net/lists/listinfo/visualpython-users
> 
> 
> 
> 
> -- 
> Regards,
> THChew
> 
> 
> ------------------------------------------------------------------------
> 
> ------------------------------------------------------------------------------
> 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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Re: [Visualpython-users] help on cvisualmodule.la

[TH C. <teo...@gm...>]

Hi,

I suggest you to look at the "build.log" under the folder "src". And maybe
you can post your "build.log" here and see.

On Wed, Nov 25, 2009 at 2:15 AM, Ramakrishnan <nr...@gm...> wrote:

> I am trying to install vpython on a FC11. I am getting the usual
> cvisualmodule.lo  and I had forgotten the work around for this.
> Please let me know how to get around this. The relevant part
> of my make is as follows
>
> Making all in src
> make[1]: Entering directory `/usr/local/visual-5.13_release/src'
> Compiling ./python/cvisualmodule.cpp ...
> make[1]: *** [cvisualmodule.lo] Error 1
> make[1]: Leaving directory `/usr/local/visual-5.13_release/src'
> make: *** [all-recursive] Error 1
>
>
> Thanks in advance
>
> Cheers
> Ram
>
> --
> Ramakrishnan N.
> Complex Fluids and Biophysics Group
> Department of Physics
> IIT Madras
>
> Success has thousand fathers while failure is an orphan  :-)
>
>
> ------------------------------------------------------------------------------
> 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
>
>


-- 
Regards,
THChew

[Visualpython-users] Help about frame in frame world position

[ale a. <ale...@gm...>]

Hi

I need help to determine the position of an object that is part of a frame
and I don't really understand how to use
*
 world_pos = f.frame_to_world (frame_pos) *

found in online documentation and I'm looking for some examples

I use a class to define the frame that is composed by a main frame that
contains two frames composed by many objects.
The object ( a servo)  is composed by two parts (servo_box and servo_frame),
I can turn the servo_frame arround its axis , but I need to connect two
servo  to create a joint like hip, knee ....
Could you show me some examples or documentation that I can study to better
understand how to calculate the points I need?


AleAle99



code like this:

class ServoWithFrame():

    def __init__ (self,offset=(0,0,0)):

        self.servo =frame(pos=offset)

        self.servo_box =frame(frame=self.servo)
        self.servo_asse =frame(frame=self.servo)

        self.main_box =box(frame=self.servo_box,
pos=(offset),axis=(self.servo_box.lenght,0,0), height =
self.servo_box.height, width
=self.servo_box.width,color=(0.4,0.4,0.4),material=materials.plastic)
        self.secondary_box= box(frame=self.servo_box, pos=((self.main_box.x
-(self.servo_box.lenght -self.servo_box.lenghtb)/2. ),(self.main_box.y+
self.servo_box.heightb/2.+self.servo_box.height/2.),self.main_box.z
),axis=(self.servo_box.lenghtb,0,0), height = self.servo_box.heightb, width
=self.servo_box.width,color=(0.4,0.4,0.4),material=materials.plastic)
        self.motor_cyl= cylinder (frame=self.servo_box,
pos=((self.main_box.x + self.servo_box.lenghtb/2. - self.servo_box.motor
),(self.main_box.y -self.servo_box.height -self.servo_box.heightb/2.+1.5
),self.main_box.z ), axis=(0,self.servo_box.motor,0), radius
=self.servo_box.width/2.,color=(0.4,0.4,0.4),material=materials.plastic)
        self.motor_main= cylinder (frame=self.servo_asse,
pos=((self.main_box.x - self.servo_box.lenght/2. + self.servo_box.width/2.
),(self.main_box.y -self.servo_box.height/2 -
self.servo_box.attacw),self.main_box.z ), axis=(0,self.servo_box.attacl,0),
radius =self.servo_box.attacw/2.,
color=(0.9,0.9,0.95),material=materials.plastic)
        self.motor_cylb= cylinder (frame=self.servo_box,
pos=(self.motor_main.x ,self.motor_main.y+ self.servo_box.height+
self.servo_box.heightb+4.5,self.motor_main.z ), axis=(0,2,0), radius
=self.servo_box.motor/2.,color=(0.4,0.4,0.4),material=materials.plastic)

        self.servo_frame =frame(frame=self.servo)
        self.left_circle = cylinder (frame=self.servo_frame, pos =
self.motor_cylb.pos,radius =self.servo_frame.width/2.,
lenght=self.servo_frame.thick,material=materials.rough)
        self.left_box =box(frame=self.servo_frame,
pos=(self.left_circle.x+0.5,self.left_circle.y -(self.servo_frame.width/2.
-1) , self.left_circle.z), height =
self.servo_frame.height-self.servo_frame.width/2., width
=self.servo_frame.width,
lenght=self.servo_frame.thick,material=materials.rough)
        self.right_circle = cylinder (frame=self.servo_frame,
pos=(self.left_circle.x + self.servo_frame.lenght -
self.servo_frame.thick,self.left_circle.y,self.left_circle.z), radius
=self.servo_frame.width/2.,
lenght=self.servo_frame.thick,material=materials.rough)
        self.right_box =box(frame=self.servo_frame,
pos=(self.right_circle.x+0.5,self.right_circle.y-(self.servo_frame.width/2.
-1) , self.right_circle.z), height =
self.servo_frame.height-self.servo_frame.width/2., width
=self.servo_frame.width,
lenght=self.servo_frame.thick,material=materials.rough)

        self.low_box = box(frame=self.servo_frame,
pos=(self.left_circle.x+self.servo_frame.lenght/2.,self.left_circle.y-self.servo_frame.width/2.
- (self.servo_frame.height-self.servo_frame.width) - self.servo_frame.thick
,self.left_circle.z),axis=(self.servo_frame.lenght,0,0),  height = 1, width
=self.servo_frame.width,material=materials.rough)
        self.side_dx = box(frame=self.servo_frame, pos=(self.low_box.x
-self.servo_frame.thick/2.
,self.low_box.y+1,self.low_box.z+self.servo_frame.width/2),axis=(self.servo_frame.lenght-4*self.servo_frame.thick,0,0),
height = 3, width =self.servo_frame.thick,material=materials.rough)
        self.side_sx = box(frame=self.servo_frame, pos=(self.low_box.x
-self.servo_frame.thick/2.
,self.low_box.y+1,self.low_box.z-self.servo_frame.width/2),axis=(self.servo_frame.lenght-4*self.servo_frame.thick,0,0),
height = 3, width =self.servo_frame.thick,material=materials.rough)

[Visualpython-users] help on cvisualmodule.la

[Ramakrishnan <nr...@gm...>]

I am trying to install vpython on a FC11. I am getting the usual
cvisualmodule.lo  and I had forgotten the work around for this.
Please let me know how to get around this. The relevant part
of my make is as follows

Making all in src
make[1]: Entering directory `/usr/local/visual-5.13_release/src'
Compiling ./python/cvisualmodule.cpp ...
make[1]: *** [cvisualmodule.lo] Error 1
make[1]: Leaving directory `/usr/local/visual-5.13_release/src'
make: *** [all-recursive] Error 1


Thanks in advance

Cheers
Ram

-- 
Ramakrishnan N.
Complex Fluids and Biophysics Group
Department of Physics
IIT Madras

Success has thousand fathers while failure is an orphan  :-)

[Visualpython-users] 200,000 point objects

[Symion <kn...@ip...>]

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body bgcolor="#ffffff" text="#000000">
Hi there,<br>
&nbsp;&nbsp;&nbsp; Here is another program dealing with large numbers of objects
(200,000 points)!<br>
<br>
Source: <a href="http://home.iprimus.com.au/knoware/webpage/Shell_2.py">Shell_2.py</a><br>
<br>
This is a Stellar Anatomy type demonstration.<br>
<br>
Symion
</body>
</html>

Re: [Visualpython-users] Vpython on PyPi?

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

Many people who install VPython (with Python, of course) do so only to run 
existing programs, not write new ones. And even many of those who write new 
programs are new to programming, and on Windows or Mac they may never have used 
the command line. Examples include thousands of physics students (and small 
numbers of physics teachers) learning about computational modeling. Moreover, I 
don't know of any difficulties with installation on Windows or Mac.

However, if a distutils version would address some of the difficult dependency 
issues on Linux, I'm all for it and would be pleased to see someone develop a 
distutils package.

Bruce Sherwood

Michele Mattioni wrote:
> My primary target is linux, however this method is cross platform.
> I'm not an expert but I think distutils can take care of the compilation
> 
> http://stackoverflow.com/questions/724664/python-distutils-how-to-get-a-compiler-that-is-going-to-be-used
> 
> It's possible to submit also binary package, so the compilation can be 
> skipped and the binary can be downlaoded. Of course three binary should 
> be available for all the three platform.
> 
> Well if they are installing vpython and try to code something with it, I 
> think an ``easy_install vpython`` should not scare them too much.
> 
> Cheers,
> Michele.
> 
> On Sat, Nov 21, 2009 at 5:59 PM, Bruce Sherwood <Bru...@nc... 
> <mailto:Bru...@nc...>> wrote:
> 
>     You don't specify a platform, but I'm guessing this would be just
>     for Linux? In
>     particular, it's not possible to use distutils for Windows because
>     compilation
>     of C++ is required, and most Windows users don't have a compiler
>     installed. For
>     that matter, most Windows users don't use a command-line interface.
> 
>     I would be interested to hear from knowledgeable people whether this
>     would be a
>     better scheme for Linux, and possibly for the Mac (though again,
>     many Mac users
>     don't use a command-line interface, and there are expectations of
>     what an
>     installer should look like).
> 
>     Bruce Sherwood
> 
>     Michele Mattioni wrote:
>      > Dear all,
>      >
>      > do you think it's a good idea to change the installation of
>     vpython into
>      > a distutils classic one?
>      >
>      > In this way the package can be uploaded on the PYthon Packages
>     Index and
>      > can be listed as one of the dependencies for packages that use it.
>      > More over to install it will be just
>      > easy_install vpython
>      >
>      > Is that possible?
>      >
>      > Cheers,
>      > Michele.
> 
>     ------------------------------------------------------------------------------
>     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...
>     <mailto:Vis...@li...>
>     https://lists.sourceforge.net/lists/listinfo/visualpython-users
> 
> 

Re: [Visualpython-users] Vpython on PyPi?

[Michele M. <mat...@gm...>]

My primary target is linux, however this method is cross platform.
I'm not an expert but I think distutils can take care of the compilation

http://stackoverflow.com/questions/724664/python-distutils-how-to-get-a-compiler-that-is-going-to-be-used

It's possible to submit also binary package, so the compilation can be
skipped and the binary can be downlaoded. Of course three binary should be
available for all the three platform.

Well if they are installing vpython and try to code something with it, I
think an ``easy_install vpython`` should not scare them too much.

Cheers,
Michele.

On Sat, Nov 21, 2009 at 5:59 PM, Bruce Sherwood <Bru...@nc...>wrote:

> You don't specify a platform, but I'm guessing this would be just for
> Linux? In
> particular, it's not possible to use distutils for Windows because
> compilation
> of C++ is required, and most Windows users don't have a compiler installed.
> For
> that matter, most Windows users don't use a command-line interface.
>
> I would be interested to hear from knowledgeable people whether this would
> be a
> better scheme for Linux, and possibly for the Mac (though again, many Mac
> users
> don't use a command-line interface, and there are expectations of what an
> installer should look like).
>
> Bruce Sherwood
>
> Michele Mattioni wrote:
> > Dear all,
> >
> > do you think it's a good idea to change the installation of vpython into
> > a distutils classic one?
> >
> > In this way the package can be uploaded on the PYthon Packages Index and
> > can be listed as one of the dependencies for packages that use it.
> > More over to install it will be just
> > easy_install vpython
> >
> > Is that possible?
> >
> > Cheers,
> > Michele.
>
>
> ------------------------------------------------------------------------------
> 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] Vpython on PyPi?

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

You don't specify a platform, but I'm guessing this would be just for Linux? In 
particular, it's not possible to use distutils for Windows because compilation 
of C++ is required, and most Windows users don't have a compiler installed. For 
that matter, most Windows users don't use a command-line interface.

I would be interested to hear from knowledgeable people whether this would be a 
better scheme for Linux, and possibly for the Mac (though again, many Mac users 
don't use a command-line interface, and there are expectations of what an 
installer should look like).

Bruce Sherwood

Michele Mattioni wrote:
> Dear all,
> 
> do you think it's a good idea to change the installation of vpython into 
> a distutils classic one?
> 
> In this way the package can be uploaded on the PYthon Packages Index and 
> can be listed as one of the dependencies for packages that use it.
> More over to install it will be just
> easy_install vpython
> 
> Is that possible?
> 
> Cheers,
> Michele.

[Visualpython-users] Vpython on PyPi?

[Michele M. <mat...@gm...>]

Dear all,

do you think it's a good idea to change the installation of vpython into a
distutils classic one?

In this way the package can be uploaded on the PYthon Packages Index and can
be listed as one of the dependencies for packages that use it.
More over to install it will be just
easy_install vpython

Is that possible?

Cheers,
Michele.

Re: [Visualpython-users] Problems with VPython 5.12 on Fedora 11

[Cross, J. <JC...@CS...>]

Seth and I worked on this off list.  He was using an nVidia driver supplied by a 3rd party yum repository instead of the official driver installer from nvidia.com.  Sometimes there are problems with the 3rd party packaged drivers, which seems to be the case in this instance.  Switching to the official driver installer fixed his problem.

Jason

Re: [Visualpython-users] Ubuntu 9.10 (Karmic)

[Guy K. K. <g....@ma...>]

On Thu, 19 Nov 2009 18:29:44 Bruce Sherwood wrote:
> There are no licensing issues with flower128.tga (I took that picture of
>  cactus  flowers myself), and I don't know why it would be missing.

Was just a rough guess anyway. So I guess someone either wasn't sure and 
removed it, or it just got forgotten maybe ...

Guy

-- 
Guy K. Kloss
Institute of Information and Mathematical Sciences
Te Kura Pūtaiao o Mōhiohio me Pāngarau
Massey University, Albany (North Shore City, Auckland)
473 State Highway 17, Gate 1, Mailroom, Quad B Building
voice: +64 9 414-0800 ext. 9585   fax: +64 9 441-8181
G....@ma... http://www.massey.ac.nz/~gkloss

Re: [Visualpython-users] pylab

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

After a bit of googling, the situation seems to be this:

matplotlib (http://matplotlib.sourceforge.net) is a Python 2d plotting library 
which includes a module named pylab. I'm guessing that's what you're looking for.

A confusing factor is that at http://www.scipy.org/PyLab there is a discussion 
that starts out with this:

See the following post for further discussion of the difference between the 
vision for a new PyLab expressed on this page, and the existing pylab package 
which is part of matplotlib:
http://www.nabble.com/pylab-td24910613.html

Incidentally, the www.scipy.org/PyLab discussion makes a case for a new pylab to 
be invoked as "from pylab import *" which would import a bunch of stuff almost 
anyone doing scientific processing will need (including numpy and scipy), rather 
like the current situation with Visual. The essayist then says, foreseeing 
objections, "But there are so many names! Not really. from scipy import * brings 
in about 20 subpackages (i.e. signal such that you still need to do signal.ifft, 
but not scipy.signal.ifft) and only 15 new symbols."

Bruce Sherwood

marco bittelli wrote:
> I am trying to install pylab for python 2.6, but I have problem finding 
> the package (even in the main Python website).       
> 
>  
> 
> Could you help me ?
> 
>  
> 
> Marco
> 
>  
> 
> Marco Bittelli, Ph.D.
> 
> Department of Agro-Environmental Science and Technology
> 
> University of Bologna, Italy
> 
> Viale Fanin, 44.
> 
> 40125, Bologna, Italy
> 
> email:mar...@un...
> 
> http://www.dista.unibo.it/~bittelli

[Visualpython-users] pylab

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

I am trying to install pylab for python 2.6, but I have problem finding the
package (even in the main Python website).        

 

Could you help me ?

 

Marco

 

Marco Bittelli, Ph.D.

Department of Agro-Environmental Science and Technology

University of Bologna, Italy

Viale Fanin, 44.

40125, Bologna, Italy

email:mar...@un...

http://www.dista.unibo.it/~bittelli

  _____  

Da: Gary Pajer [mailto:gar...@gm...] 
Inviato: Thursday, November 19, 2009 4:53 AM
A: vpusers
Oggetto: Re: [Visualpython-users] Ubuntu 9.10 (Karmic)
installation/fix:WARNING!!

 

I meant Guy Kloss' instructions.  Sorry, poor proofreading.

On Wed, Nov 18, 2009 at 10:48 PM, Gary Pajer <gar...@gm...> wrote:

I'm running Kubuntu 9.10 and python 2.6.4 on a Thinkpad T41 which sports the
dreaded Radeon Mobility 7500 video set.

I followed            instructions exactly, then began to try example
programs.

doublependulum worked fine.

The next one I tried was stonehenge.  I got an error that visual.text could
not be found.  
Then I tried stars, and got an error that newaxis was not defined.  Uh oh.
Not good.
I also tried gyro and gas.   The visual.text error came up more than once.

Then I noticed that some icons were missing from my system, replaced by
question marks.  I figured I should at least logout/in, perhaps restart X,
perhaps reboot.  So I logout via the KDE menu, and the system drops into a
character terminal login screen ... unusual ... but I can't log in.  Any
user name entered resulted in the login prompt returning.  No password
prompt.  I tried other "terminals"  (alt-f2, etc) same result.  I could get
no useful response doing anything I could think of.  Out of ideas, I powered
down.

On restart, a filesystem check started, but ended in failure: filesystem
could not be mounted.  It did give me a "rescue" terminal session of some
sort, and I was able to run fsck.  A couple dozen errors were found and
repaired.  Things like orphaned inodes, broken chains,  I don't remember
exactly, but I'm sure you get the idea.  I don't know if there is any
permanent "damage".

I wish I could give you more information, but there's not much more to tell.
If you think there might be clues left behind, I'll gladly look for them.

-gary



 

Re: [Visualpython-users] Ubuntu 9.10 (Karmic) installation/fix: WARNING!!

[Gary P. <gar...@gm...>]

On Wed, Nov 18, 2009 at 11:13 PM, Guy K. Kloss <g....@ma...> wrote:

> Hi Gary,
>
> the symptoms you've mentioned indicate that something else went (massively)
> wrong, as I doubt that any "normal" Python process or anything that the
> Visual
> library can do would result in such effects. Maybe it's got to do with your
> graphic card's drivers. Anyway, whatever process *you* start should usually
> *only* be able to affect user space things. But your descriptions go way
> beyond what a graphics based application generally would do.
>
> I have just checked again here, and all demos I've checked worked. Well,
> stonehenge.py did not, but that was only due to the fact that the file
> "flower128.tga" is not present in the samples directory. I don't know,
> maybe
> it was removed due to licensing issues or just forgotten. But also all
> surface
> textures worked here.
>
> It would however be good to track down what your problem is. Maybe not as
> much
> for VPython as for your own system's sake. Have a look at /var/log/messages
> and /var/log/syslog what might have happened and led to the crash. Also
> check
> whether other OpenGL based applications show similar effects.
>

I found some corrupt memory errors in the log that occurred close in time to
my usage of another new application that I had started with sudo.  I'm
tracking down that line also.


>
> Hope these were some hints on tracking down the cause,
>
> Guyt
>
> --
> Guy K. Kloss
> Institute of Information and Mathematical Sciences
> Te Kura Pūtaiao o Mōhiohio me Pāngarau
> Massey University, Albany (North Shore City, Auckland)
> 473 State Highway 17, Gate 1, Mailroom, Quad B Building
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