RE: [Visualpython-users] Major Problems with Latest Windows Relea se of VPython

VPython Group,

Sorry to raise such a fuss. I forgot that our company is automatically
installing updates for OS fixes now, and after taking Bruce's advice (I had
only reinstalled when the problems first occurred - then, after Bruce's
e-mail, I uninstalled everything and reinstalled), everything worked fine. 

Thanks Bruce and Andy,
Thom

       |-----Original Message-----
       |From: Bruce Sherwood [mailto:bas...@un...]
       |Sent: Wednesday, April 23, 2003 2:45 PM
       |To: IVES,THOM (HP-Boise,ex1); Visual Python Users (E-mail)
       |Subject: Re: [Visualpython-users] Major Problems with 
       |Latest Windows
       |Release of VPython
       |
       |
       |I installed the latest VPython for Windows (prints 
       |2003-03-15 when you run),
       |and I can't reproduce any of these problems. All the 
       |demos and test routines
       |run fine. This is on Windows 2000.
       |
       |At first your very last test showed nothing, but that 
       |was simply because
       |there was a typo in your faces position list:
       |
       |VertexList = [(0,0,0),(1,0,0),(1,0,0)]
       |should be
       |VertexList = [(0,0,0),(1,0,0),(1,1,0)]
       |
       |Unless you've already tried it, the first thing to do 
       |might be to uninstall
       |Visual (and maybe even Python) and reinstall. It sounds 
       |like something is
       |corrupted on your machine, or in the download.
       |
       |Bruce Sherwood
       |
       |----- Original Message -----
       |From: "IVES,THOM (HP-Boise,ex1)" <tho...@hp...>
       |To: "Visual Python Users (E-mail)"
       |<vis...@li...>
       |Sent: Wednesday, April 23, 2003 3:46 PM
       |Subject: [Visualpython-users] Major Problems with 
       |Latest Windows Release of
       |VPython
       |
       |
       |> This is a BUG REPORT. I found these bugs running the 
       |Windows 2000 Pro OS.
       |> Please be patient as you read on.
       |>
       |> I was trying to get rid of some bugs in a new piece 
       |of code I am writing,
       |> which relies heavily on VPython. It was maturing 
       |nicely, but I was running
       |> into some problems with the scene.exit = 0 attributes 
       |of display (see here
       |> http://vpython.org/webdoc/visual/display.html
       |> <http://vpython.org/webdoc/visual/display.html> ), so 
       |I decided to try and
       |> upgrade my VPython, and things stopped working 
       |altogether, introducing
       |> problems that I have never experienced before. 
       |Thinking the problem might
       |be
       |> with me, I went back to some of my simplest 
       |applications and the demo
       |> programs and still noted problems. One of these 
       |aspects can be represented
       |> with the following small program modified from the 
       |cross product.py demo
       |> program below. If you run this code, it should 
       |produce a grid for the
       |plane
       |> that illustrates the visual cross product, but it 
       |does not. Please read
       |> further below this small program.
       |>
       |> ________________________ Test Program 1 - Modification of the
       |> CrossProduct.py Demo________________________
       |> from visual import *
       |> # demonstration of vector cross product
       |>
       |> print """
       |> Vector cross product: Red cross Green = Yellow
       |> Drag to change green vector
       |> Click to toggle fixed angle or fixed length
       |> """
       |>
       |> scene.title="Vector Cross Product"
       |> scene.width=600
       |> scene.height=600
       |> R = 0.15*4
       |> plane = curve(pos=[(0, -10, -10), (0, -10, 10), (0, 
       |10,10), (0, 10, -10),
       |>               (0, -10, -10), (0,-6,-10), (0,-6,10), 
       |(0, -2, 10), (0, -2,
       |> -10),
       |>               (0,2,-10), (0,2,10), (0,6,10), 
       |(0,6,-10),(0,10, -10),
       |>
       |>               (0,10,-6), (0,-10,-6), (0,-10,-2), 
       |(0,10,-2), (0,10,2),
       |>               (0,-10,2), (0,-10,6), (0,10,6)])
       |> ___________________________________End of Test Program
       |> 1__________________________________________
       |>
       |> So, I performed some other tests. This next small 
       |program is a slight
       |> modification of the graphtest.py demo. Try running 
       |it. Note that no axes
       |are
       |> drawn and that you get an error. If you raise the 
       |value of -70 to say
       |about
       |> -50, or lower the 70 to something lower, the errors 
       |will go away, but you
       |> still get a problem with no axes being drawn. In 
       |fact, with regard to the
       |> axes problem, even the simplest program where you try 
       |to use the curve
       |> object will not draw a curve on the screen in 3D.
       |>
       |> _________________________________ Modification of 
       |graphtest.py demo
       |> __________________________________
       |> from visual.graph import *
       |>
       |> # Using a graph-plotting module
       |> oscillation = gdisplay(xtitle='t', ytitle='Response')
       |>
       |> list = []
       |> for t in arange(-70, 70, 1):
       |>     pos=(t, 5.0*cos(-0.2*t)) # )
       |>     list.append(pos)
       |>
       |> funct1 = gcurve(pos = list, color=color.cyan)
       |>
       |> ________________________________ End of Test Program 2
       |> _____________________________________________
       |>
       |> Finally, I tried a simple test with the last feature 
       |I was struggling
       |with.
       |> First, if I try to run the faces_heightfield.py demo, 
       |it will generate an
       |> error and not draw anything. Second, when I run the 
       |faces_cone.py, I do
       |not
       |> get a cone. I get a cube, and the following message...
       |>
       |>
       |> Traceback (innermost last)
       |>   File 
       |"c:\python22\lib\site-packages\visual\demos\faces_cone.py", line
       |13,
       |> in ?
       |>     model = faces( pos = zeros( (N*3,3), Float ), frame = f )
       |> TypeError: Array can not be safely cast to required type
       |>
       |> Third, if I try to run the most simple face possible, 
       |a triangle, I get
       |> nothing drawn at all. Try the program below...
       |>
       |> ________________________________ Simple program to 
       |draw a Triangle Face
       |> _____________________________________
       |> from visual import *
       |>
       |> f = frame()
       |> #scene.background = color.black
       |> VertexList = [(0,0,0),(1,0,0),(1,0,0)]
       |> NormalList = [(0,0,1),(1,0,1),(1,0,1)]
       |>
       |> surface = faces(pos=VertexList, normal=NormalList, 
       |color=color.red)
       |> _________________________________ End of Test Program 3
       |> ____________________________________________________
       |>
       |> I think a download of the previous version of Visual 
       |should be made
       |> available until these problems can be fixed.
       |>
       |> Thom
       |>
       |>
       |>
       |>
       |>
       |>   _____
       |>
       |>
       |>
       |<http://www.hp.com/Redirect/gw/useng_welcome/logo/=http:
       |//welcome.hp.com/cou
       |> ntry/us/eng/welcome.htm> HP logo
       |> Thom Ives, Ph.D.
       |>
       |> R&D Engineering Scientist
       |>
       |> 11413 Chinden Blvd MS 400
       |> Boise, ID.  83714
       |>
       |> 208.396.6880 Phone
       |> 208.396.3587 Fax
       |> tho...@hp...  <mailto:tho...@hp...>
       |>
       |> Home:
       |> 5556 N Columbine Pl
       |> Boise, ID 83713
       |> 208.412.3971 Phone
       |> 413.332.6558 Fax
       |> tw...@ca... <mailto:tw...@ca...>
       |>   _____
       |>
       |>
       |>
       |>
       |