Hiding entities when they are not on screen

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Malice
 #1
It depends on what sort of a game, how many entities etc.

Many previous suggestions involve having your game split into areas, where all the entities for an area are parented to a pivot or something. At the change of area, this pivot (and thus all recursive children) is hidden.

Some of the following may help:

http://www.blitzbasic.com/codearcs/codearcs.php?code=1244

http://www.blitzbasic.com/Community/posts.php?topic=41049

http://www.blitzbasic.com/Community/posts.php?topic=41247

plus check out the code archives (maybe search them for 'Occlusion' as this is what you are trying to achieve.