[Necip]

How can I check if the player is looking down? What is the exact position for it?

[-Prodigy-]

Why not play with the function? Use OnPlayerUpdate and print debug messages to obtain the "exact" position.

[Necip]

I just want to know the full down looking position, I know it's the Z but what's the exact position...

[BullseyeHawk]

Just take the full size of the player model and decrease the Z.

I remember that Z-0.3 is the start of the legs. Play with it and try Z-0.8 or Z-1.0
That should be the complete ground of the player.