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I'm using multiple videoplanes and need to know what determines which plane goes on top and which one on the bottom.

I will be using five planes, and I need to make sure the designated background plane always goes to the bottom.

I'm using multiple videoplanes and need to know what determines which plane goes on top and which one on the bottom. 

I will be using five planes, and I need to make sure the designated background plane always goes to the bottom. 

Videoplane question