Recent changes to bugs

Mouse status not updating

Jim de Graff — Sun, 04 Sep 2011 22:05:07 -0000

The value of scene.mouse.button never changes. Try running the following:

from visual import *

scene.title = "Test"
status = label(text="test",color=(1,0,0),box=False)

while True:

rate(100)

stat = ("\nevents: %d") % (scene.mouse.events) \ + ("\nclicked: %d") % (scene.mouse.clicked) \ + ("\npos: %d,%d,%d") % (scene.mouse.pos.x,scene.mouse.pos.y,scene.mouse.pos.z)

if scene.mouse.button is None:
stat += "\nbutton: None"
else:
stat += "\nbutton: " + scene.mouse.button

status.text = stat

2D graphics error in WinXP on AMD dual-core

Myungsunn Ryu — Mon, 17 Aug 2009 16:11:59 -0000

I'm using VPython 2.6.2 in Windows XP running on AMD 64bit dual-core processor PC.
When I try to use visual.graphics module I get an error message:

Runtime Error!
Program: C\Python26\pythonw.exe
This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information.

I tried to pinpoint the occurence of this error with the Debugger by tracking into function calls that makes troble.
I ran the example code "graphtest.py" in "C:\Python26\lib\site-packages\visual\examples\".
Here's what I see in the debug control before going another step to get the error:

'bdb'.run(), line 368:exec cmd in globals, locals
'visual.graph',<module>(), line 8: oscillation = gdisplay(xtitle='Time', ytitle='Response')
'visual.graph',__init__(), line 193: self.axisdisplay(axis, axissign)
'visual.graph',axisdisplay(), line 258: font=graphfont, xoffset=tminor, opacity=0, box=0, line=0)
> 'visual.primitives',__init__(), line 69: self.__display.add_renderable(self)

The Local variables at this point were:
_other None
keywords {'box':0, 'opacity':0, 't... 'font': '', 'xoffset':5,0}
self <visual.primitives.label object at 0x0147BF00>

(hundreds of globals I cannot capture or type them out here)

This was as far as I could go.
Can I get some help how to fix the error?
Thanks in advance.

make fails

Anonymous — Thu, 29 May 2008 21:12:15 -0000

make fails for me and says:

In file included from ../include/python/convex.hpp:12,
from ./python/convex.cpp:6:
../include/python/num_util.hpp:68:31: warning: numpy/arrayobject.h: No such file or directory
../include/python/num_util.hpp:68:31: warning: numpy/arrayobject.h: No such file or directory
../include/python/num_util.hpp:90: error: 'npy_intp' was not declared in this scope
../include/python/num_util.hpp:90: error: 'NPY_TYPES' was not declared in this scope
../include/python/num_util.hpp:100: error: 'npy_intp' was not declared in this scope

and prints a lot of other errors. My system is linux and the version is visual-4.beta26. I tracked the issue down to be in the configure script which fails to find the right PYTHON_PREFIX under linux:

if test $PYTHON_PLATFORM = "win32"; then
PYTHON_PREFIX=`$PYTHON -c "from distutils import sysconfig; print sysconfig.PREFIX"`

PYTHON_EXEC_PREFIX=`$PYTHON -c "from distutils import sysconfig; print sysconfig.EXEC_PREFIX"`

else
PYTHON_PREFIX='${prefix}'

PYTHON_EXEC_PREFIX='${exec_prefix}'

changing the first line to
if test $PYTHON_PLATFORM = "win32" -o test $PYTHON_PLATFORM = "win32"; then
works for me. I don't know however why autoconf doesn't do this itself.

Python on Mac OS X Leopard

Anonymous — Sun, 24 Feb 2008 15:05:04 -0000

VPython needs the following LDFLAGS entry for compiling on Leopard:

LDFLAGS="-framework OpenGL -dylib_file /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib:/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib"

This gets around a documented bug-feature in Leopard where the OpenGL libraries are installed in a different place from previous versions.

In the fink info file for visual-py24 this can be achieved by adding an appropriate export LDFLAGS line to the info file.

label distance from camera not quite right

Anonymous — Thu, 22 Feb 2007 01:56:08 -0000

Hi,
I've observed that the z-ind computation of a label's distance from the camera (and subsequently which label appears in front) isn't quite right.
Please see example code (it's work on an interactive tree builder)

Thanks for the really awesome project. Exactly what I needed,
Beracah
beracah@mit.edu

Segfault when when with pylab / matplotlib functions

Anonymous — Wed, 31 Jan 2007 22:42:08 -0000

Version information:
---------------------------
Vpython visual-4.beta14
In [2]: visual.__version__
Out[2]: '1.0.1'
Python 2.4.4, Fedora Core 6 updated.

A segfault is reliably produced when running vpython along with pylab / matplotlib functions:

cut------------------------------------------
from visual import *
from pylab import *

ball = sphere( pos=(0,0,0), color=color.red)
x=arange(0,10,0.1)
y=sin(2*pi*x)
plot(x,y)
cut ------------------------------------------

Remvoving _either_ the visual sphere call _or_ the pylab plot call eliminates the segfault

RuntimeError: boost::bad_weak_ptr when running graphtest.py

Anonymous — Sun, 23 Jul 2006 06:14:37 -0000

Using Ubuntu 6.06 (python2.4) I get the following
traceback :

Traceback (most recent call last):
File "graphtest.py", line 8, in ?
oscillation = gdisplay(xtitle='t', ytitle='Response')
File
"/usr/lib/python2.4/site-packages/visual/graph.py",
line 192, in __init__ currentdisplay.select()
RuntimeError: boost::bad_weak_ptr

Out of curiosity I examined graph.py.

From what I can see the currentdisplay is initialised
from the display from a test sphere which is created
and subsequently destroyed.

test = sphere(visible=0)
currentdisplay = test.display
test = None # discard test sphere

Uncommenting the test = None , "fixes" the failure.

From what I assume is that on discarding the test
sphere, the pointer to the display is also getting hosed.

replacing the code above with :

currentdisplay = display.get_selected()

Also fixes the problem, in a similar way as the
controls.py package.

Now the only reason to get the currentdisplay is to
select afterwards. Since selecting the selected display
seems a bit superfluous, I tried what it would do when
removing all references to currentdisplay : works fine.

grts,

pti(at)telenet.be

Doesn't work with Fedora Linux

Mike Edwards — Sat, 25 Mar 2006 18:49:02 -0000

Later versions of RedHat and other distros seem to be
using gtkglarea2 instead of gtkglarea. Would it be
possible to update the dependencies in the configure
script?

label broken on Linux/Unix

Bruce Sherwood — Wed, 12 Oct 2005 17:33:42 -0000

The label command is currently not working properly on
Linux and Unix (Mac OSX). No matter what height is
specified for the font, you get a small font. I'm not
sure whether this worked in the pre-Boost version.

diff_angle for the same vectors returns non zero

ashot — Tue, 21 Jun 2005 01:32:21 -0000

>v = vector()
>v2 = vector()
Lv.diff_angle(v2)
1.5707963267948966