visualpython-users

[Visualpython-users] breathing screen

[Eric H. <eha...@co...>]

Hey all,

    First off I gotta say this is cool stuff !!

    Wrote a quick example (included below), can some on help with the
problme of "breathing" ?  If you run the example you will notice the outer
ring changed size based on the orientation of the other rings.  Is there a
way to stop this auto scaling ?

Cheers
Eric


from visual import *

org=(1,1,1)
o_ring =
ring(pos=org,axis=(0,1,0),radius=2.0,thickness=0.5,color=color.blue)
m_ring = ring(pos=org,axis=(1,0,0),radius=1.0,thickness=0.5,color=color.red)
i_ring =
ring(pos=org,axis=(0,0,1),radius=3.0,thickness=0.5,color=color.green)
f_ring =
ring(pos=org,axis=(0,0,1),radius=4.0,thickness=0.5,color=color.white)

while 1:
    o_ring.rotate(angle=pi/180.,axis=(1,1,0),origin=org)
    m_ring.rotate(angle=pi/180.,axis=(1,0,1),origin=org)
    i_ring.rotate(angle=pi/180.,axis=(0,1,1),origin=org)
    rate(20)

Re: [Visualpython-users] breathing screen

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

Very pretty!

After establishing the basic elements of the scene, execute 
"scene.autoscale = 0". The problem is that VPython attempts to move the 
camera to ensure that all of the scene is visible at all times. The 
algorithm isn't perfect, so you get some "breathing" in some situations.

Bruce Sherwood

At 08:44 PM 02/06/17 -0400, Eric Hagemann wrote:
>Hey all,
>
>     First off I gotta say this is cool stuff !!
>
>     Wrote a quick example (included below), can some on help with the
>problme of "breathing" ?  If you run the example you will notice the outer
>ring changed size based on the orientation of the other rings.  Is there a
>way to stop this auto scaling ?
>
>Cheers
>Eric