Re: [Visualpython-users] Visibility Bug?

[Dunning, R. <dun...@lo...>]

Theo,

"objects" is list of all *visible* objects in the display. When you loop
over scene.objects, any objects tagged as invisible are automatically
skipped in the loop because they're not part of that list.  I'm not sure I
would call this a bug--it's how the class is coded.

I came up with the following that may do what you need.  (By the way, if you
chose to reinstantiate the non-visible objects, the memory tied up by the
former objects should be released.)


from visual import *

rate(10)

spheres = []

for i in xrange(7):
    spheres.append(sphere(pos=vector(i*3,0,0)))


scene.my_objects = spheres


for i in scene.objects:
    i.visible = 0


print "They're gone!"

print "Bring them back"

for j in scene.objects:
    j.visible = 1  # Doesn't work, as you've discovered.

print "Now try it."



for a in scene.my_objects: # This will work.
    a.visible = 1



# Hope this helps.

--
Rodney Dunning
Assistant Professor of Physics
Longwood University
http://www.longwood.edu/staff/dunningrb
 

> -----Original Message-----
> From: vis...@li... 
> [mailto:vis...@li...] On 
> Behalf Of Theo DuBose
> Sent: Wednesday, May 30, 2007 1:31 PM
> To: vpython
> Subject: [Visualpython-users] Visibility Bug?
> 
> Hello,
> 
>     I have noticed what appears to be a bug when dealing with 
> frames and visibility. If I make all the objects in the frame 
> disappear, with
> 
>              for obj in a.objects:
>                       obj.visible = 0
> 
> and then attempt to make the objects reappear with
>           
> 
>              for obj in a.objects:
>                       obj.visible = 0
> 
> They do not appear. Is this a known, or does anyone have any 
> suggestions? Presently I am overcoming this by 
> reinstantiating the invisible objects, but i would like to be 
> able to reduce the amount of memory this uses.
> 
> Thanks,
>     Theo
> 
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