Re: [Visualpython-users] Question about frame objects

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

For completeness, I tried this on an old version of VPython (Python 2.3 
plus Visual from October 2003). Both in that old version and the current 
one, when an object is made invisible it is also removed from the 
display.objects and frame.objects lists. This seems like a design flaw, 
since as you point out once the object has been removed from the list 
you can't find it that way. You'd have to keep a copy of the list before 
making anything invisible.

I have a very dim recollection that this was supposed to be a feature, 
not a bug, that if an object was invisible you didn't want to be told 
about it while looking through the list of objects. Does anyone remember 
anything about this? At the moment (admittedly it's late at night, so I 
might be thinking fuzzily) it seems much better to keep the invisible 
objects in the lists so that you can reference them again through the 
list, as you tried to do. Looping through the list you could easily skip 
objects that are invisible, if that's what you want to do.

Bruce Sherwood

Jeremy Sachs wrote:

> The VPython documentation says that the objects in a frame can be  
> made "temporarily invisible" with the following:
>
> for obj in someframe.objects:
>     obj.visible=0
>
> And that works, only not temporarily. For any other object, I can set  
> the "visible" property to 1 and that object will be drawn. I can't  
> get this to work with the contents of a frame. Am I overlooking  
> something? There are three labels in the frame, as well as more  
> typical objects, but I don't suspect them to be the source of the  
> problem. Could someone please offer a suggestion?
>
>     -Jeremy S.
>
>
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