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

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

Not absolutely sure I understand the question, but if you can make the
window (say) 600 by 600, and specify scene.range = 300, and then your
coordinates are effectively pixel coordinates.

Bruce Sherwood

On Wed, Nov 3, 2010 at 5:54 PM, Danny Caballero
<dan...@gm...> wrote:
> 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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