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16.90.5.46 - stack (SceneScript element)

 <stack

The  <stack command, or it's synonym  <push, 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,  <stack or  <push 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  <stack (a copy of the current conditions is saved) Modify the initial conditions as extensively as you like Create objects using the modified conditions  <unstack (copy taken off the stack overwrites the changes) Create further objects using initial conditions
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