Re: [Visualpython-users] Fwd: Vpython -> define perspective.

[Daπid <dav...@gm...>]

Another option, deppending on what do you exactly want, work in your
SR but give all the coordinates to VPython in its own system. Create a
function that convers from your CS to VP's one and the opposite one,
and use them everywhere.

That would be, nevertheless, messy and propense to bugs.


On Wed, Nov 3, 2010 at 9:38 PM, Bruce Sherwood <bas...@nc...> wrote:
> It can't be done. VPython insists on the coordinate system being a
> right-handed coordinate system. What you can do is have y to the
> right, z up, and x coming toward you, as in the following example:
>
> from visual import *
> x = curve(pos=[(0,0,0), (1,0,0)], color=color.red)
> y = curve(pos=[(0,0,0), (0,1,0)], color=color.green)
> z = curve(pos=[(0,0,0), (0,0,1)], color=color.blue)
> label(pos=x.pos[1], text='x')
> label(pos=y.pos[1], text='y')
> label(pos=z.pos[1], text='z')
> scene.up = (0,0,1)
> scene.forward = (-1,0,0)
>
> Bruce Sherwood
>
> 2010/11/3 Virgílio Bento <vir...@gm...>:
>> Dear all,
>>
>> I'm trying to define a scene with the following axis (see attachment).
>>
>>
>> How should i define the scene.up and the scene.forward to achieve this
>> perspective?
>> Tried several combinations but still haven't found the one.
>>
>> Thanks for your answer.
>>
>> Regards, Virgilio Bento
>>
>>
>>
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