native Float:get_user_aiming(index, &id, &body, dist = 9999);
Client index to trace aim from
Variable to store hit client index (if applicable)
Variable to store hit client body part (if applicable)
Maximum distance of the trace
Traces the client's current aim vector to see if it hits something.
If the trace does not hit a client, id and body will be set to 0.
If the trace hits nothing within the specified distance, 0 is returned.
Distance between the trace start and end point
If the client index is not within the range of 1 to
MaxClients, an error will be thrown.