How do online pool/billard games have 3D balls? - Newbie & Debugging Questions - JVM Gaming

I know they must have like 50 different angles of the ball for its position but does anybody know EXACTLY how they do it ? im looking to do something similar. Here is an example of what i mean. Its only a 2D game but when the balls are hit they dont just move flat they roll asif they would in real life/3D Thanks!

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