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

[Danny C. <dan...@gm...>]

Sorry to high jack this thread, but this might be a similar question.
Is there a way to specify sizes of things like curves in real space?
Like where the limits of the curve are fractions of the scene size in
pixels?

I'm looking to create axes for HS students that can be drawn across
the scene regardless of the size of the objects in the scene.

Thanks,
Danny

On Wed, Nov 3, 2010 at 4:45 PM, Daπid <dav...@gm...> wrote:
> 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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