visualpython-users

[Visualpython-users] cleaning up

[Ben A. <be...@be...>]

2 questions:

1. is there a way to delete all objects in the scene?  i don't see a 
scene.clear() type of function.

2. is there a way to programatically close the visual python window?

Thanks,
-Ben

Re: [Visualpython-users] cleaning up

[Aaron M. <mav...@gm...>]

On Thu, Aug 25, 2011 at 8:04 AM, Ben Axelrod <be...@be...> wrote:
> 1. is there a way to delete all objects in the scene?  i don't see a
> scene.clear() type of function.

The visual.ui.display object (by default, the active one is
visual.scene) maintains a tuple with references to all visible objects
called (oddly enough) 'objects'. You can clear the scene by making
them all invisible.

for obj in visual.scene.objects:
    obj.visible = False

If there are no external references to the objects, since 'objects'
only refers to *visible* objects, this will also (I think) remove the
last reference and the objects will be GC'd by Python, so this
shouldn't be leaky.

> 2. is there a way to programatically close the visual python window?

The visual.ui.display object has a 'visible' property also; setting
display.visible = False closes the window.

Strangely, however, display.visible.objects continues to refer to all
previously visible objects, yet setting display.visible = True does
not bring them back (and even attempting to manually make them visible
via these references doesn't appear to work). Thus, it is probably
prudent to at least do the above "clearing" if you're going to do
this, as it is evidently leaky otherwise.

-- 
Aaron Mavrinac
www.mavrinac.com

Re: [Visualpython-users] cleaning up

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

I don't understand this description of making a display invisible and
then visible. What I thought would happen is what does happen: Setting
display invisible just makes it invisible, doesn't delete it, and then
later making it visible again makes it visible again, with all of its
objects intact.

Bruce Sherwood

On Mon, Aug 29, 2011 at 1:44 PM, Aaron Mavrinac <mav...@gm...> wrote:
> On Thu, Aug 25, 2011 at 8:04 AM, Ben Axelrod <be...@be...> wrote:
>
>> 2. is there a way to programatically close the visual python window?
>
> The visual.ui.display object has a 'visible' property also; setting
> display.visible = False closes the window.
>
> Strangely, however, display.visible.objects continues to refer to all
> previously visible objects, yet setting display.visible = True does
> not bring them back (and even attempting to manually make them visible
> via these references doesn't appear to work). Thus, it is probably
> prudent to at least do the above "clearing" if you're going to do
> this, as it is evidently leaky otherwise.
>
> --
> Aaron Mavrinac
> www.mavrinac.com
>

Re: [Visualpython-users] cleaning up

[Aaron M. <mav...@gm...>]

On Mon, Aug 29, 2011 at 6:24 PM, Bruce Sherwood <Bru...@nc...> wrote:
> I don't understand this description of making a display invisible and
> then visible. What I thought would happen is what does happen: Setting
> display invisible just makes it invisible, doesn't delete it, and then
> later making it visible again makes it visible again, with all of its
> objects intact.

Oh? Could be a bug specific to my setup then (Gentoo Linux, Python
2.7.1, Visual 5.4)? Maybe something at the OpenGL level?

>>> import visual
>>> visual.sphere()
<vis.primitives.sphere object at 0xf4d0a8>
>>> visual.scene.visible = False
>>> visual.scene.visible = True
>>> visual.scene.objects
(<vis.primitives.sphere object at 0xf4d0a8>,)

When I do the above, I end up with a blank window. As you can see,
visual.scene is not deleted and it still has a reference to the
sphere, but I am definitely not seeing a sphere in the window. :)

Let me know if you need any other information from me.

-- 
Aaron Mavrinac
www.mavrinac.com