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§ 16.90.5.34 - push (SceneScript element)
<push>The <push> command, or it's synonym <stack> , is used to take a complete copy of the current environment and save it on a stack of such information. The information stack may be up to 1024 deep; if you get over 1024 levels deep, further stacking commands have no effect.
Typically, <push> or <stack> is used to save the current state, unusual and/or extensive changes are made for a particular object or group of objects, and the the <unstack> language element (or it's synonyms, <pop> and <pull> ) are used to restore the previous state.
This is a classic "programming stack", in the sense that the first thing you push onto it will be the last thing pulled off.
Here is the general concept:
Set up initial set of conditions
Create the objects that use those conditions
<push> (a copy of the current conditions is saved)
Modify the initial conditions as extensively as you like
Create objects using the modified conditions
<pull> (copy taken off the stack overwrites the changes)
Create further objects using initial conditions
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