visualpython-users

[Visualpython-users] Error with forward and up

[alessandro <bom...@gm...>]

I create 3 icons in my prog.:

Top.view
Front-view
Side-view

I change the forward attribute of my scene (named scena1). I set 
scena1.up = vector (0,0,1) and define 3 func:

def vista_alto(obj):
    global scena1
    scena1.forward = vector(0,0,-1)
   
def vista_fronte(obj):
    global scena1
    scena1.forward = vector(0,-1,0)

def vista_lato(obj):
    global scena1
    scena1.forward = vector(-1,0,0)

but when click on the top-view (1° def) an error appears:

*scena1.forward = vector(-1,0,0)
ValueError: forward may not be colinear with up.*

Reading the documentation I found this requirement but I'm not able to 
solve it. How can I do?

Alessandro Barracco

Re: [Visualpython-users] Error with forward and up

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

If you're willing to use the newer Visual 5, this problem has been fixed. There 
is no way in Visual 3 around this other than never to point the camera exactly 
in the direction of up or -up.

(The fix in Visual 5 is quite technical: It consists of adjusting scene.forward 
whenever it is exactly in the direction of scene.up or -scene.up to point in a 
slightly different direction as far as the view is concerned, and the human 
viewer doesn't notice.)

Bruce Sherwood

alessandro wrote:
> I create 3 icons in my prog.:
> 
> Top.view
> Front-view
> Side-view
> 
> I change the forward attribute of my scene (named scena1). I set 
> scena1.up = vector (0,0,1) and define 3 func:
> 
> def vista_alto(obj):
>     global scena1
>     scena1.forward = vector(0,0,-1)
>    
> def vista_fronte(obj):
>     global scena1
>     scena1.forward = vector(0,-1,0)
> 
> def vista_lato(obj):
>     global scena1
>     scena1.forward = vector(-1,0,0)
> 
> but when click on the top-view (1° def) an error appears:
> 
> *scena1.forward = vector(-1,0,0)
> ValueError: forward may not be colinear with up.*
> 
> Reading the documentation I found this requirement but I'm not able to 
> solve it. How can I do?
> 
> Alessandro Barracco
> 
> 
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Re: [Visualpython-users] Error with forward and up

[alessandro <bom...@gm...>]

OK. So the only way is to use Visual 5? I need some help installing 
Visual 5 on Ubuntu Hardy. I've tried to install the package made by Guy 
K. Kloss here

https://gutefee.massey.ac.nz/moin/Python/3D

but when I use in my prog. it doesn't work. I'm using pygtk and glade building my app. 

I have this func main:


def main():
    global scena1     # my scene
    global griglia
    global nomefile
  
    app.signal_autoconnect(dic)

    gui_main.show()
    gui_main.move(0,0)
    scena1 = disegno.nuovo()         # call to my  drawing -module
   
    disegno.xyz(100)                        # here I draw 3 arrow (my 
xyz axis)
    griglia = 2000                             
    step=100
    disegno.base(-griglia,-griglia,griglia,griglia,step,True)   # here I 
draw a grid (my ground plane)
   
  
    gtk.main()



Running the app must appear 3 wins: my main win, a second win (the 
option) and the Visual win (with the grid and the 3 arrow). But 
everything seems to be "freezed". with Visual 3 it work fine. I think 
there is something wrong with the gtk.main

Alessandro Barracco




Bruce Sherwood ha scritto:
> If you're willing to use the newer Visual 5, this problem has been 
> fixed. There is no way in Visual 3 around this other than never to 
> point the camera exactly in the direction of up or -up.
>
> (The fix in Visual 5 is quite technical: It consists of adjusting 
> scene.forward whenever it is exactly in the direction of scene.up or 
> -scene.up to point in a slightly different direction as far as the 
> view is concerned, and the human viewer doesn't notice.)
>
> Bruce Sherwood

Re: [Visualpython-users] Error with forward and up

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

On Sun, 19 Apr 2009 21:06:07 alessandro wrote:
> OK. So the only way is to use Visual 5? I need some help installing
> Visual 5 on Ubuntu Hardy. I've tried to install the package made by Guy
> K. Kloss here
>
> https://gutefee.massey.ac.nz/moin/Python/3D
>
> but when I use in my prog. it doesn't work.

I must say that I didn't extensively test the package for Hardy, and the 
(former) Hardy box now is running Jaunty. So I can't go back and verify. But 
the packages were installed using checkinstall, therefore no dependencies 
should be listed inside the .deb package, and you're on your own installing 
them.

What I would suggest is this:

* Install the python-visual 3 package (from your distribution) to pull in most
  dependencies
* remove that package again
* install the new python-visual 5 package provided from my wiki (URL above)
* run some samples

See if the samples will work. If not, check the error message(s) you may get 
on the console to figure out what other package might be missing and needs 
installing.

HTH,

Guy

-- 
Guy K. Kloss
Institute of Information and Mathematical Sciences
Te Kura Pūtaiao o Mōhiohio me Pāngarau
Room 2.63, Quad Block A Building
Massey University, Auckland, Albany
Private Bag 102 904, North Shore Mail Centre
voice: +64 9 414-0800 ext. 9585   fax: +64 9 441-8181
eMail: G....@ma...  http://iims.massey.ac.nz

Re: [Visualpython-users] Error with forward and up

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

I'm wouldn't think that it's useful to pick up dependencies from Visual 3, which 
for Linux was based on the old GTK, not the current GTK+ on which Visual 5 is based.

But it seemed like he was able to build Visual 5; the problem was that it 
wouldn't run within the larger framework he was trying to use. Evidently he 
wasn't trying simply to run a VPython program (though now that I think of it, it 
would be useful to know whether a simple example program would run).

If the problem is the build itself, the thing to do is to study carefully the 
extensive notes in INSTALL.txt, which is included in the Linux tarball available 
at vpython.org.

Bruce Sherwood

Guy K. Kloss wrote:
> On Sun, 19 Apr 2009 21:06:07 alessandro wrote:
>> OK. So the only way is to use Visual 5? I need some help installing
>> Visual 5 on Ubuntu Hardy. I've tried to install the package made by Guy
>> K. Kloss here
>>
>> https://gutefee.massey.ac.nz/moin/Python/3D
>>
>> but when I use in my prog. it doesn't work.
> 
> I must say that I didn't extensively test the package for Hardy, and the 
> (former) Hardy box now is running Jaunty. So I can't go back and verify. But 
> the packages were installed using checkinstall, therefore no dependencies 
> should be listed inside the .deb package, and you're on your own installing 
> them.
> 
> What I would suggest is this:
> 
> * Install the python-visual 3 package (from your distribution) to pull in most
>   dependencies
> * remove that package again
> * install the new python-visual 5 package provided from my wiki (URL above)
> * run some samples
> 
> See if the samples will work. If not, check the error message(s) you may get 
> on the console to figure out what other package might be missing and needs 
> installing.
> 
> HTH,
> 
> Guy
> 

Re: [Visualpython-users] Error with forward and up

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

My apologies: I shouldn't have said "now that I think of it", as you had already 
said this!

Bruce Sherwood

Bruce Sherwood wrote:
> I'm wouldn't think that it's useful to pick up dependencies from Visual 3, which 
> for Linux was based on the old GTK, not the current GTK+ on which Visual 5 is based.
> 
> But it seemed like he was able to build Visual 5; the problem was that it 
> wouldn't run within the larger framework he was trying to use. Evidently he 
> wasn't trying simply to run a VPython program (though now that I think of it, it 
> would be useful to know whether a simple example program would run).
> 
> If the problem is the build itself, the thing to do is to study carefully the 
> extensive notes in INSTALL.txt, which is included in the Linux tarball available 
> at vpython.org.
> 
> Bruce Sherwood
> 
> Guy K. Kloss wrote:
>> On Sun, 19 Apr 2009 21:06:07 alessandro wrote:
>>> OK. So the only way is to use Visual 5? I need some help installing
>>> Visual 5 on Ubuntu Hardy. I've tried to install the package made by Guy
>>> K. Kloss here
>>>
>>> https://gutefee.massey.ac.nz/moin/Python/3D
>>>
>>> but when I use in my prog. it doesn't work.
>> I must say that I didn't extensively test the package for Hardy, and the 
>> (former) Hardy box now is running Jaunty. So I can't go back and verify. But 
>> the packages were installed using checkinstall, therefore no dependencies 
>> should be listed inside the .deb package, and you're on your own installing 
>> them.
>>
>> What I would suggest is this:
>>
>> * Install the python-visual 3 package (from your distribution) to pull in most
>>   dependencies
>> * remove that package again
>> * install the new python-visual 5 package provided from my wiki (URL above)
>> * run some samples
>>
>> See if the samples will work. If not, check the error message(s) you may get 
>> on the console to figure out what other package might be missing and needs 
>> installing.
>>
>> HTH,
>>
>> Guy
>>
> 
> ------------------------------------------------------------------------------
> Stay on top of everything new and different, both inside and 
> around Java (TM) technology - register by April 22, and save
> $200 on the JavaOne (SM) conference, June 2-5, 2009, San Francisco.
> 300 plus technical and hands-on sessions. Register today. 
> Use priority code J9JMT32. http://p.sf.net/sfu/p
> _______________________________________________
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