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I thought I was missing something. I barely use switch statements.

By switch structure do you mean:

int testInt = 10;

switch (testInt) {
case 1: system.out.println("int = 1");
case 2: system.out.println("int = 2");
...ETC
}

Trying not to be annoying, but what is an "accelerator structure?"

ok, I will try it

intersects() can also be used for collision detection, right?