DATA-ORIENTED DESIGN The hardware will thank you.
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This post on the UNIX philosophy talks about how effective decoupling the stages of a pipeline can be, how it adds flexibility, modularity, and testability.
What is not mentioned is that this way of processing data applies at all levels, even down to your logic code that drives your render calls. Games are databases with highly complex query functions, and investing time in understanding how to drive a complex query through combinations of transforms and intermediate results such as this art pipeline example, can lead to more flexible, modular, and testable game code.