Question how to find pointers?

[Cur$3d_0n3]

i cant understand how people do it i looked into gunz (on a privat server) and i cant find how everyone finds pointers. addresses i can find, i can do alot by myself but i cant figure this out like getdirection

float *GetDirection(unsigned long ZCharacter) { return (float*)(ZCharacter + 0x3A); }

i looked everywhere and tried everything like adding the hex numbers together but nothing works.