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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