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It just means if someone decided to renumber the material IDs or slot numbers for some reason they wouldn't have to examine every 0 or 2 in the code and decide if it needed to change.
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That makes sense. To be honest it took me forever to wrap my head around object oriented thinking. I first coded on my C64 in BASIC and was so used to linear thinking. It wasn't until I started reading others C++ code that it began to sink in.