visualpython-users

[Visualpython-users] trouble compiling visual 5.0

[David R. <ro...@ph...>]

I'm attaching my build.log and config.log as requested (by the message
printed when compiling).  It looks like maybe I need a more recent
boost library or something? If so, the autoconf test should be
tightened, so I get a configure error telling me what's wrong...

For those who don't want to look at long log files, the error message is:

./core/util/render_manager.cpp:4:26: warning: threadpool.hpp: No such
file or directory
./core/util/render_manager.cpp:61:23: warning: no newline at end of file
./core/util/render_manager.cpp: In static member function 'static
double cvisual::render_manager::paint_displays(const
std::vector<cvisual::display*, std::allocator<cvisual::display*> >&,
bool)':
./core/util/render_manager.cpp:14: error: 'boost::threadpool' has not
been declared
./core/util/render_manager.cpp:14: error: expected initializer before '*' token
./core/util/render_manager.cpp:31: error: 'swap_thread_pool' was not
declared in this scope
./core/util/render_manager.cpp:32: error: expected type-specifier
./core/util/render_manager.cpp:32: error: expected `;'
./core/util/render_manager.cpp:37: error: 'swap_thread_pool' was not
declared in this scope
./core/util/render_manager.cpp:37: error: 'bind' is not a member of 'boost'
./core/util/render_manager.cpp:41: error: 'swap_thread_pool' was not
declared in this scope

David

Re: [Visualpython-users] General 3D mouse control, what's the correct strategy ?

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

I can only note that one environment that seems to have good 3D mousing 
is Second Life.

Bruce Sherwood

Stef Mientki wrote:
> hello,
> 
> This is a general question of how to manipulate 3D objects with the 
> mouse on 2D screen ?
> 
> I've a default scene, with the centre in the middle of the screen.
> I've created a room, with the floor in the positive xz-plane.
> now I've objects on the ceiling, that can move and rotate in the xz-plane.
> 
> I project both the mouse position and the objects to the floor,
> and then calculate the angles and move or rotate the object.
> 
> Sometimes this works great, but  sometimes the movement seems to be 
> opposite to where my mouse is going,
> especially the rotation behaves strange.
> For rotating the following strategy works quit well, but seems very 
> unnatural to me:
> - click the object to select it for rotation (around a fixed axis),
> - move the cursor far away, moving in the direction away from the object
> and thus from the axis of ration and from the center of the screen
> - then move the mouse around the rotation point
> 
> Are there better methods ?
> Maybe some websites ?
> 
> thanks,
> Stef Mientki
> 
> 
> 
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Re: [Visualpython-users] V5.0 Tk-Visual

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

Change the three color statements like this:

self.rr = string.atoi(rstr)/100.0 should be self.rr = int(rstr)/100.0

I think this is a Python 2.5 vs Python 2.4 issue.

However, I'll comment that we've removed Tk-Visual.py from the example 
set because we could not figure out a way for this program to work on 
the Mac. With the new native-mode version for the Mac (no X11, no Fink), 
there is a clash between the Mac interact loop and that of Tk.

Bruce Sherwood

Symion wrote:
> running V5.0
> Ran the example program   Tk-Visual.py   and IDLE recorded the following 
> error.
> 
> VPython WARNING: errors in shader program:
> Fragment shader(s) failed to link,  vertex shader(s) linked. r
> Exception in Tkinter callback
> Traceback (most recent call last):
>    File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>      return self.func(*args)
>    File "C:\Python25\Lib\site-packages\visual\examples\Tk-Visual.py", 
> line 64, in <lambda>
>      scalebb = 
> Scale(tkr,orient=VERTICAL,from_=100,to=0,label="B",command=lambda str: 
> pp.set_blue(str))
>    File "C:\Python25\Lib\site-packages\visual\examples\Tk-Visual.py", 
> line 45, in set_blue
>      self.bb = string.atoi(bstr)/100.0
> NameError: global name 'string' is not defined
> 
> This type of error was repeated every time the RGB sliders were used.
> 
> Symion
>

Re: [Visualpython-users] V5.0 shading error

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

You will see shader errors and/or the inability to display materials 
such as wood if your graphics hardware does not support Pixel Shader 
3.0. The key point is this statement in the Visual 5.0 help (see the 
"What's new" section or the "materials" section):

Materials will work with graphics cards that support Pixel Shader 3.0 
("PS 3.0"). For details, see
http://en.wikipedia.org/wiki/Pixel_shader#Hardware. Some materials may 
work with graphics cards that support PS 2.0, but other materials may 
need to be manually disabled; see instructions in the site-settings.py 
module in the Visual package in your site-packages folder. If the 
graphics hardware does not support pixel shaders, the material property 
is ignored. If you think you should be able to use materials but have 
trouble with their display or performance, we highly recommend upgrading 
your video card drivers to the latest version.

Bruce Sherwood

P.S. It will be of interest to hear from users about what hardware does 
and doesn't work with materials.

Symion wrote:
> running V5.0
> Ran the example program   texture_and_lighting.py   and it seemed to
> work, but IDLE reported the following error.
> 
> VPython WARNING: errors in shader program:
> Fragment shader(s) failed to link,  vertex shader(s) linked. ˜
> VPython WARNING: errors in shader program:
> Fragment shader(s) failed to link,  vertex shader(s) linked. r
> VPython WARNING: errors in shader program:
> Fragment shader(s) failed to link,  vertex shader(s) linked. r
> 
> Something similar happens when running material_test.py.
> 
> Symion

[Visualpython-users] V5.0 Tk-Visual

[Symion <sy...@pr...>]

running V5.0
Ran the example program   Tk-Visual.py   and IDLE recorded the following 
error.

VPython WARNING: errors in shader program:
Fragment shader(s) failed to link,  vertex shader(s) linked. r
Exception in Tkinter callback
Traceback (most recent call last):
   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
     return self.func(*args)
   File "C:\Python25\Lib\site-packages\visual\examples\Tk-Visual.py", 
line 64, in <lambda>
     scalebb = 
Scale(tkr,orient=VERTICAL,from_=100,to=0,label="B",command=lambda str: 
pp.set_blue(str))
   File "C:\Python25\Lib\site-packages\visual\examples\Tk-Visual.py", 
line 45, in set_blue
     self.bb = string.atoi(bstr)/100.0
NameError: global name 'string' is not defined

This type of error was repeated every time the RGB sliders were used.

Symion

[Visualpython-users] V5.0

[Symion <sy...@pr...>]

Just installed Vpython 5.0 on a ASUS Notebook, running Windows Vista 
home edition and Python 2.5.2.
No problems! Very friendly, very easy.

Symion

[Visualpython-users] V5.0 shading error

[Symion <sy...@pr...>]

running V5.0
Ran the example program   texture_and_lighting.py   and it seemed to
work, but IDLE reported the following error.

VPython WARNING: errors in shader program:
Fragment shader(s) failed to link,  vertex shader(s) linked. ˜
VPython WARNING: errors in shader program:
Fragment shader(s) failed to link,  vertex shader(s) linked. r
VPython WARNING: errors in shader program:
Fragment shader(s) failed to link,  vertex shader(s) linked. r

Something similar happens when running material_test.py.

Symion

Re: [Visualpython-users] Visual 5.0 release candidate now available

[<bre...@un...>]

Great to see such a fantastic program being further developed and 
streamlined.  It's already up and running on my Windows XP box.

Much appreciation to Bruce and all the contributors.





Bruce Sherwood <Bru...@nc...> 
09/12/2008 02:22 PM

To
vpusers <vis...@li...>
cc

Subject
[Visualpython-users] Visual 5.0 release candidate now available






At vpython.org there is now available the Visual 5.0 release candidate 
for Windows, Intel Mac 10.5, and Linux. A version for PowerPC Mac is 
forthcoming. The Mac version does not use X11 nor depend on Fink.

This new version has been tested against a sizable suite of existing 
programs, but it is likely that wider use will identify bugs to be 
fixed, so please report problems you may encounter.

There remains a major component to be completed, which David Scherer is 
working on. There are various significant problems with IDLE, with 
particularly serious issues on the Mac (in fact, the MacPython IDLE has 
major mouse handling problems, which you can sometimes overcome by 
clicking in the title bar, and it doesn't even offer a configuration 
menu option for IDLE). If you find problems with IDLE, as you will at 
the very least on the Mac, you need not report them, as this is being 
worked on.

Visual 5.0 was created by David Scherer and Bruce Sherwood. Jonathan 
Brandmeyer provided support in Visual 4beta for opacity, local lighting, 
and textures, and made some important architectural changes, but had to 
stop work on the project before it was completed.  Further development 
has led to API changes which are incompatible with the Visual 4beta 
release, so this release is called version 5 instead of 4.

The late Arthur Siegel implemented dependence on the currently supported 
numpy library in place of Numeric, which is no longer supported. Hugh 
Fisher provided a big start on the native-mode Mac version. Michael 
Temkine fixed some bugs and implemented keyboard handling for Windows.

Previous to Visual 4beta, Jonathan Brandmeyer made several major 
contributions to Visual 3, including changing the connection between 
Python and C++ from CXX, which was no longer supported, to the Boost C++ 
libraries, and implementing auto-configurable installations for Linux.

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[Visualpython-users] Visual 5.0 release candidate now available

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

At vpython.org there is now available the Visual 5.0 release candidate 
for Windows, Intel Mac 10.5, and Linux. A version for PowerPC Mac is 
forthcoming. The Mac version does not use X11 nor depend on Fink.

This new version has been tested against a sizable suite of existing 
programs, but it is likely that wider use will identify bugs to be 
fixed, so please report problems you may encounter.

There remains a major component to be completed, which David Scherer is 
working on. There are various significant problems with IDLE, with 
particularly serious issues on the Mac (in fact, the MacPython IDLE has 
major mouse handling problems, which you can sometimes overcome by 
clicking in the title bar, and it doesn't even offer a configuration 
menu option for IDLE). If you find problems with IDLE, as you will at 
the very least on the Mac, you need not report them, as this is being 
worked on.

Visual 5.0 was created by David Scherer and Bruce Sherwood. Jonathan 
Brandmeyer provided support in Visual 4beta for opacity, local lighting, 
and textures, and made some important architectural changes, but had to 
stop work on the project before it was completed.  Further development 
has led to API changes which are incompatible with the Visual 4beta 
release, so this release is called version 5 instead of 4.

The late Arthur Siegel implemented dependence on the currently supported 
numpy library in place of Numeric, which is no longer supported. Hugh 
Fisher provided a big start on the native-mode Mac version. Michael 
Temkine fixed some bugs and implemented keyboard handling for Windows.

Previous to Visual 4beta, Jonathan Brandmeyer made several major 
contributions to Visual 3, including changing the connection between 
Python and C++ from CXX, which was no longer supported, to the Boost C++ 
libraries, and implementing auto-configurable installations for Linux.

[Visualpython-users] General 3D mouse control, what's the correct strategy ?

[Stef M. <s.m...@ru...>]

hello,

This is a general question of how to manipulate 3D objects with the 
mouse on 2D screen ?

I've a default scene, with the centre in the middle of the screen.
I've created a room, with the floor in the positive xz-plane.
now I've objects on the ceiling, that can move and rotate in the xz-plane.

I project both the mouse position and the objects to the floor,
and then calculate the angles and move or rotate the object.

Sometimes this works great, but  sometimes the movement seems to be 
opposite to where my mouse is going,
especially the rotation behaves strange.
For rotating the following strategy works quit well, but seems very 
unnatural to me:
- click the object to select it for rotation (around a fixed axis),
- move the cursor far away, moving in the direction away from the object
and thus from the axis of ration and from the center of the screen
- then move the mouse around the rotation point

Are there better methods ?
Maybe some websites ?

thanks,
Stef Mientki

Re: [Visualpython-users] Is it possible to detect key changes during drag ?

[Stef M. <s.m...@ru...>]

Sorry Bruce

Bruce Sherwood wrote:
> I say again that as is documented, and exploited in the routine I 
> posted, scene.mouse.alt etc. CAN be examined during a drag.
>
You're completely right.
The program below is indeed working ok.
My program didn't seem to work,
because I tested too fast and my program (inclusive it's surrounding) is 
much slower,
it looked like it didn't work.
With my slow program, alt-shift-ctrl are detected much slower than the 
normal keys,
so I'll go for something like the z-x-c keys.

thanks,
Stef

Re: [Visualpython-users] Is it possible to detect key changes during drag ?

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

I say again that as is documented, and exploited in the routine I 
posted, scene.mouse.alt etc. CAN be examined during a drag.

Here's a more complex version of the routine, in which you have to hit 
the sphere in order to begin to drag, and during the drag you can change 
the color of the sphere by ctrl, alt, or shift (or press b or g), or 
change the color back to white by releasing the key.

scene.range=10
s = sphere(radius=0.5)
drag = False
while 1:
     rate(100)
     m = scene.mouse
     if m.events:
         mm = scene.mouse.getevent()
         if mm.drag and mm.pick is s:
             drag = True
         elif mm.drop:
             drag = False
     if drag:
         s.pos = m.pos
         if m.alt:
             s.color = color.red
         elif m.ctrl:
             s.color = color.cyan
         elif m.shift:
             s.color = color.yellow
         else:
             s.color = color.white
         if scene.kb.keys:
             k = scene.kb.getkey()
             if k == 'b':
                 s.color = color.blue
             elif k == 'g':
                 s.color = color.green

Why do you say that these keys can't be detected during a drag, when 
this routine and the previous routine I posted show them being detected? 
I'm confused.

It is true that keyboard events do not include pressing ctrl or alt of 
shift by themselves: they are modifiers of other keys.

Bruce Sherwood

Stef Mientki wrote:
> thanks Bruce,
> 
> Bruce Sherwood wrote:
>> Information about crtl, alt, and shift is part of scene.mouse; see the 
>> documentation on handling mouse events.
> But as far as I can see:
> - the status of Ctrl / Alt doesn't change if there's no mouse event, i.e 
> when dragging an object.
> - Ctrl / Alt isn't catched by the keyboard event
>> Also, keyboard events need not block, just as mouse events need not 
>> block. scene.kb.keys is nonzero if there is a keyboard event waiting 
>> to be processed, just as scene.mouse.events is nonzero if there is a 
>> mouse event wating to be processed.
> Thanks, I didn't read that correct .
>> I'm guessing that what you mean by your final question is whether it 
>> is possible to specify a function to be called when an event occurs, 
>> rather than watching for an event in a loop, as in the routine above. 
>> The answer is no; you have to detect events in a loop.
>>
> No, but you gave the answer above,
> 
> cheers,
> Stef
>> Bruce Sherwood
>>
>> Stef Mientki wrote:
>>> hello,
>>>
>>> I would like to detect if one of the special keys,
>>> like Ctrl-Alt-Shift changes during mouse dragging.
>>>
>>> As far as I can see,
>>> this doesn't seem possible,
>>> because
>>> - those keys don't generate a mouse event
>>> - waiting for a key event blocks the dragging
>>> Is this correct ?
>>>
>>> A more general question is:
>>> is it possible to detect key or mouse events,
>>> without waiting to happen ?
>>>
>>> thanks,
>>> Stef
>>>
>>> ------------------------------------------------------------------------------ 
>>>
>>> SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, 
>>> Nevada.
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>>> help
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>>
> 
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Re: [Visualpython-users] Is it possible to detect key changes during drag ?

[Stef M. <s.m...@ru...>]

thanks Bruce,

Bruce Sherwood wrote:
> Information about crtl, alt, and shift is part of scene.mouse; see the 
> documentation on handling mouse events.
But as far as I can see:
- the status of Ctrl / Alt doesn't change if there's no mouse event, i.e 
when dragging an object.
- Ctrl / Alt isn't catched by the keyboard event
>
> Also, keyboard events need not block, just as mouse events need not 
> block. scene.kb.keys is nonzero if there is a keyboard event waiting 
> to be processed, just as scene.mouse.events is nonzero if there is a 
> mouse event wating to be processed.
Thanks, I didn't read that correct .
>
> I'm guessing that what you mean by your final question is whether it 
> is possible to specify a function to be called when an event occurs, 
> rather than watching for an event in a loop, as in the routine above. 
> The answer is no; you have to detect events in a loop.
>
No, but you gave the answer above,

cheers,
Stef
> Bruce Sherwood
>
> Stef Mientki wrote:
>> hello,
>>
>> I would like to detect if one of the special keys,
>> like Ctrl-Alt-Shift changes during mouse dragging.
>>
>> As far as I can see,
>> this doesn't seem possible,
>> because
>> - those keys don't generate a mouse event
>> - waiting for a key event blocks the dragging
>> Is this correct ?
>>
>> A more general question is:
>> is it possible to detect key or mouse events,
>> without waiting to happen ?
>>
>> thanks,
>> Stef
>>
>> ------------------------------------------------------------------------------ 
>>
>> SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, 
>> Nevada.
>> The future of the web can't happen without you.  Join us at MIX09 to 
>> help
>> pave the way to the Next Web now. Learn more and register at
>> http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ 
>>
>> _______________________________________________
>> Visualpython-users mailing list
>> Vis...@li...
>> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>
>

Re: [Visualpython-users] Why diff_angle calculates only to pi ?

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

I'm not sure I've understood the issues, but two comments that may be 
relevant:

1) There is a math routine (imported by Visual) that returns angles 
between 0 and 2*pi: atan2(y,x).

2) In the documentation for frame there is a routine for converting from 
a position in a frame to world coordinates.

Bruce Sherwood

Stef Mientki wrote:
> hello,
> 
> playing a few days with vpython,
> I'm very satisfied, it's really powerful.
> But I've the idea,
> I'm missing a few convenience procedures (or at least they are hidden).
> 
> When animating our normal 3D world,
> we always have a floor,
> as a beginner I've the the xz-plane.
> 
> Now when moving objects with the mouse around in this environment,
> I found out that the best thing todo is to project the mouse position on 
> the floor.
> Ok there is a method for, so perfect.
> But I also want other vectors to be projected onto the floor,
> so I made a small ( 1 line ;-) routine for that.
> After moving that routine to a general library,
> I discovered that there's also a "proj" routine inside visual.
> So apparently there might be some interesting hidden routines ?
> 
> Back to the angle difference,
> for my case: mouse position and all objects projected to the floor,
> you can unambiguous determine an angle between 0 and 2*pi.
> This makes life so much easier.
> So why isn't there a procedure for calculating such a difference angle ?
> Or am I doing something stupid by projecting everything on the floor ?
> Or does nobody uses these kind mouse interactions ?
> Or ...?
> Anyway here is the small method
> 
> def XZ_Angle ( axis ) :
>   """projects the vector on the XZ-plane and
>   calculates the angle with the X-axis [ 0 .. 2*pi ]"""
>   axis = vector ( axis.x, 0, axis.z )
>   a1 = axis.diff_angle ( X_AXIS )
>   a2 = axis.diff_angle ( Z_AXIS )
>   if a2 < pi/2 :
>     a1 = 2*pi - a1
>   return a1
> 
> Although trivial, a procedure that translates radians into degrees is 
> very handy in debugging.
> And of course the frame to world translation would be a good candidate 
> for the convenience library.
> 
> Just some thoughts of a beginner,
> 
> cheers,
> Stef Mientki
> 
> 
> 
> ------------------------------------------------------------------------------
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Re: [Visualpython-users] Is it possible to detect key changes during drag ?

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

Information about crtl, alt, and shift is part of scene.mouse; see the 
documentation on handling mouse events.

Also, keyboard events need not block, just as mouse events need not 
block. scene.kb.keys is nonzero if there is a keyboard event waiting to 
be processed, just as scene.mouse.events is nonzero if there is a mouse 
event wating to be processed.

Here is an example:

scene.range=10
s = sphere(radius=0.5)
while 1:
     rate(100)
     m = scene.mouse # dragging with mouse buttons up
     s.pos = m.pos
     if m.alt:
         s.color = color.red
     elif m.ctrl:
         s.color = color.cyan
     elif m.shift:
         s.color = color.yellow
     if scene.kb.keys:
         k = scene.kb.getkey()
         if k == 'b':
             s.color = color.blue
         elif k == 'g':
             s.color = color.green

I'm guessing that what you mean by your final question is whether it is 
possible to specify a function to be called when an event occurs, rather 
than watching for an event in a loop, as in the routine above. The 
answer is no; you have to detect events in a loop.

Bruce Sherwood

Stef Mientki wrote:
> hello,
> 
> I would like to detect if one of the special keys,
> like Ctrl-Alt-Shift changes during mouse dragging.
> 
> As far as I can see,
> this doesn't seem possible,
> because
> - those keys don't generate a mouse event
> - waiting for a key event blocks the dragging
> Is this correct ?
> 
> A more general question is:
> is it possible to detect key or mouse events,
> without waiting to happen ?
> 
> thanks,
> Stef
> 
> ------------------------------------------------------------------------------
> SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada.
> The future of the web can't happen without you.  Join us at MIX09 to help
> pave the way to the Next Web now. Learn more and register at
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> _______________________________________________
> Visualpython-users mailing list
> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users

[Visualpython-users] Why diff_angle calculates only to pi ?

[Stef M. <s.m...@ru...>]

hello,

playing a few days with vpython,
I'm very satisfied, it's really powerful.
But I've the idea,
I'm missing a few convenience procedures (or at least they are hidden).

When animating our normal 3D world,
we always have a floor,
as a beginner I've the the xz-plane.

Now when moving objects with the mouse around in this environment,
I found out that the best thing todo is to project the mouse position on 
the floor.
Ok there is a method for, so perfect.
But I also want other vectors to be projected onto the floor,
so I made a small ( 1 line ;-) routine for that.
After moving that routine to a general library,
I discovered that there's also a "proj" routine inside visual.
So apparently there might be some interesting hidden routines ?

Back to the angle difference,
for my case: mouse position and all objects projected to the floor,
you can unambiguous determine an angle between 0 and 2*pi.
This makes life so much easier.
So why isn't there a procedure for calculating such a difference angle ?
Or am I doing something stupid by projecting everything on the floor ?
Or does nobody uses these kind mouse interactions ?
Or ...?
Anyway here is the small method

def XZ_Angle ( axis ) :
  """projects the vector on the XZ-plane and
  calculates the angle with the X-axis [ 0 .. 2*pi ]"""
  axis = vector ( axis.x, 0, axis.z )
  a1 = axis.diff_angle ( X_AXIS )
  a2 = axis.diff_angle ( Z_AXIS )
  if a2 < pi/2 :
    a1 = 2*pi - a1
  return a1

Although trivial, a procedure that translates radians into degrees is 
very handy in debugging.
And of course the frame to world translation would be a good candidate 
for the convenience library.

Just some thoughts of a beginner,

cheers,
Stef Mientki

[Visualpython-users] Is it possible to detect key changes during drag ?

[Stef M. <s.m...@ru...>]

hello,

I would like to detect if one of the special keys,
like Ctrl-Alt-Shift changes during mouse dragging.

As far as I can see,
this doesn't seem possible,
because
- those keys don't generate a mouse event
- waiting for a key event blocks the dragging
Is this correct ?

A more general question is:
is it possible to detect key or mouse events,
without waiting to happen ?

thanks,
Stef

[Visualpython-users] Rotating wheels

[Symion <sy...@pr...>]

I have been reading the Vpython message lists and it seems there is some 
confusion over Rotating objects and Spinning around the the scene under 
User control.

Here is a simple routine that demonstrates both.

http://home.primusonline.com.au/knoware/python/Wheel-2.py

Click into the scene with left mouse key and the Centre position of the 
User spin is changed.
Press Enter key to try again.

Re: [Visualpython-users] No way to determine the angle ob a box ?

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

If by "rotate" you mean that you used the mouse to rotate the camera 
around the scene, then scene.forward points from the camera to scene.center.

If by "rotate" you mean that you rotated the box by a program statement 
through an angle of 0.5*pi, the simple way to know what angle it was 
rotated through would be to save that angle. But notice that if you 
rotated around the axis of the box, the box's up vector will have changed.

Bruce Sherwood

Stef Mientki wrote:
> hello,
> 
> I wonder,
> if I rotate a box around it's axis,
> how can I determine the rotation angle afterwards ?
> 
> I don't see any property indicating the angle.
> It should be kept somewhere ?
> 
> thanks,
> Stef Mientki
> 
> 
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[Visualpython-users] No way to determine the angle ob a box ?

[Stef M. <s.m...@ru...>]

hello,

I wonder,
if I rotate a box around it's axis,
how can I determine the rotation angle afterwards ?

I don't see any property indicating the angle.
It should be kept somewhere ?

thanks,
Stef Mientki

Re: [Visualpython-users] Label color (and line) problem

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

No clue. With visual 3.2.11 on Python 2.5.2 on Vista, the text is red, 
and setting line=0 has no effect. The only thing I can think to do is to 
reinstall Visual.

Bruce

Gary Strangman wrote:
> Hi all,
> 
> The following minimal example on my machine produces a /white/ label in 
> the center of the screen. Doesn't matter what I use for the color keyword: 
> color=visual.color.red or color=(1,0,0) or color=(1.0,0.0,0.0), I always 
> get a white label. Any guesses as to what's going on?
> 
> C:\testdir\ python
> Enthought Python Distribution (2.5.2001) -- http://code.enthought.com
> 
> Python 2.5.2 |EPD 2.5.2001| (release25-maint:60919M, Feb 21 2008, 
> 10:31:43) [MSC
>   v.1310 32 bit (Intel)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import visual
>>>> print visual.version
> (3, 2, 11)
>>>> a = visual.label(text='test',color=(1,0,0))
>>>>
> 
> This is on WinXP (32bit) ...
> 
> Un(?)related, I'm also getting the surprising (to me) effect that if I set 
> the label keyword line=0, the label disappears entirely, regardless of 
> visibility, which doesn't appear to be the documented behavior.
> 
> I'm coming back to VPython after a long hiatus (from v2.something_small), 
> so I'm probably missing something silly here.
> 
> -best
> Gary
> 
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> The future of the web can't happen without you.  Join us at MIX09 to help
> pave the way to the Next Web now. Learn more and register at
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Re: [Visualpython-users] Preview of Visual 5

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

We are very much committed to Visual 3 programs running in Visual 5.

We've tested against a large suite of programs to make sure that there 
is compatibility between Visual 3 and Visual 5. Of course someone may 
find an incompatibility that we've missed, in which case we'll try to 
fix the problem.

In a few very rare cases we've broken something. One arcane example I 
can think of is that if you gave negative numbers in specifying the size 
of a box, Visual 3 didn't object but went ahead and did something. 
Visual 5 initially didn't object but went ahead and did something, 
something else. So now Visual 5 gives a program error if you try to 
specify a negative number for length, height, or width.

There are a few minor things not yet implemented, and that are unlikely 
to get implemented for the release of Visual 5.00: scene.cursor.visible 
is not implemented, nor scene.stereodepth, nor mouse events involving 
the right or middle mouse button.

On the other hand, as we've been warning since last March, we have NOT 
preserved compatibility with some features that were new to Visual 4beta.

Bruce Sherwood

Gary Pajer wrote:
> Will programs written for version 3 run on version 5?
> 
> In particular, I have visual.version = (3, 2, 11)
> 
> Sorry if this has been asked and answered.  I couldn't find a
> reference to this question.
> 
> -gary
> 
> On Tue, Dec 2, 2008 at 8:14 PM, Bruce Sherwood <Bru...@nc...> wrote:
>> Visual 5 is not quite ready for release, but it's very close.
>>
>> A preview is now available at vpython.org. Click on the link at the top
>> of the page for what will be the new web site, including screen shots
>> and full documentation. In the documentation section there is a page
>> describing the new features.
>>
>> Bruce Sherwood

[Visualpython-users] What's the best way to get a projection of a vector ?

[Stef M. <s.m...@ru...>]

hello,

looks like a silly question,
but simply setting the y-value to zero,
for a projection on the xz plane,
has terrible side effects.

blok = box ( pos = ( 5,4,6))
print blok.pos
a = blok.pos
a.y = 0
print blok.pos

gives me:
<5, 4, 6>
<5, 0, 6>

help the blok is moved !

inserting copy or deepcopy
import copy
a = copy.copy ( blok.pos )

gives me
ArgumentError: Python argument types in
    None.None(Vector, int)
did not match C++ signature:
    None(visual::shared_vector {lvalue}, d)

I can hardly believe that it has to be done in this way:
a = vector ( blok.pos.x, 0, blok.pos.z )


thanks,
Stef

[Visualpython-users] Label color (and line) problem

[Gary S. <st...@nm...>]

Hi all,

The following minimal example on my machine produces a /white/ label in 
the center of the screen. Doesn't matter what I use for the color keyword: 
color=visual.color.red or color=(1,0,0) or color=(1.0,0.0,0.0), I always 
get a white label. Any guesses as to what's going on?

C:\testdir\ python
Enthought Python Distribution (2.5.2001) -- http://code.enthought.com

Python 2.5.2 |EPD 2.5.2001| (release25-maint:60919M, Feb 21 2008, 
10:31:43) [MSC
  v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import visual
>>> print visual.version
(3, 2, 11)
>>> a = visual.label(text='test',color=(1,0,0))
>>>

This is on WinXP (32bit) ...

Un(?)related, I'm also getting the surprising (to me) effect that if I set 
the label keyword line=0, the label disappears entirely, regardless of 
visibility, which doesn't appear to be the documented behavior.

I'm coming back to VPython after a long hiatus (from v2.something_small), 
so I'm probably missing something silly here.

-best
Gary

Re: [Visualpython-users] Where are the libraries present?

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

k roy wrote:
> I have got a small doubt which is definitely stupid, but I need to
> know that when we write
> "from visual import *"
> where is the visual directory present from which the modules are extracted.
> Is it /usr/lib/python2.5/site-packages/visual or somewhere else???
Easiest answer to this is:

     import visual
     print visual.__file__

--Scott David Daniels
Scott David Da...@Ac...