[Visualpython-users] deleting scenes

[Guy K. K. <g....@ma...>]

Hi,

as some may have noticed, I also run VPython with many things in batch mode. 
Unfortunately I've just hit a bump doing so. I introduced another layer for 
batching some computations/visualisations. So I'm wrapping my module and 
calling it repeatedly with changing parameters in a batch. Unfortunately when 
I'm doing that for me VPython "misbehaves". I cannot seem to find a way to 
discard a previous scene to create a new one. Whenever I just do it naively, I 
get this error:

RuntimeError: Cannot change parameters of an active window

As the new scene is being initialised with window title, size, ...

I've already tried to retrieve the current scene with 

    my_scene = visual.display.get_selected()

And then set its visibility to False:

    my_scene.visible = False

In this case the program just stalls and needs to be killed from another 
console. Or I try to delete the scene instance using:

    del my_scene

or

    del visual.scene

Which doesn't do anything as apparently visual.scene is a static module 
variable that cannot be discarded.

Any ideas on how to make use of it in a sensible way without having to 
manually create new processes for each sample just to discard the scene?

Guy

-- 
Guy K. Kloss
Institute of Information and Mathematical Sciences
Te Kura Pūtaiao o Mōhiohio me Pāngarau
Massey University, Albany (North Shore City, Auckland)
473 State Highway 17, Gate 1, Mailroom, Quad B Building
voice: +64 9 414-0800 ext. 9585   fax: +64 9 441-8181
G....@ma... http://www.massey.ac.nz/~gkloss