[Visualpython-users] What does 'visible' actually do ..

[Alan L. <al...@li...>]

Hi all,

   Just started looking at VPython and instantly got confused by the
reference manual (!):

In one section I read

"visible If false (0), object is not displayed; e.g. ball.visible = 0
Use ball.visible = 1 to make the ball visible again."

Whereas in another I read

"To delete a Visual object just make it invisible: ball.visible = 0

Technical detail: If you later re-use the name ball, for example by
creating a new object and naming it ball, Python will be free to release
the memory used by the object formerly named ball"

So which is it? I tried a test and created a frame with a number of
objects, walked the objects attribute setting them to invisible. When I
looked at the objects attribute again it was empty - certainly implying
the latter case is correct and once I set something invisible I should
assume it is gone forever.

Is this true? How can I set something to be invisible and then make it
visible again without having to reconstruct the object?

Tnx
Alan

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