Game Logic Positional Information

[chris330 0]

I've just posted this at OFPEC, but thought i'd try here too

Dear all,

I have a question. This is a script I have been writing which works fine on single player but has not been tested on multiplayer. There's no need to get bogged down in the script too much all I need to know is because game logic units are always local to the server, does this mean that their positions are always defined on the server and broadcast to the clients? Or, do I have to instruct the client machine(s) to change the postions of the game logics too, or can I just get away with altering their positions on the server?

The following script has been made assuming that the client machine(s) do not have to update the positions of the game logics. Rather it has been made assuming that the positions of the game logics in the mission are determined and broadcast globally by the server. Have a look at it. I have annotated the bits I need some clarification on (they are only small parts of the script).

Please note it is a camera script which utilises two game logic units. One named cameraeffect1 and one named cameraeffect2.

//I think this bit is now okay as I understand that camcreate

//must be executed on the client machines too.

_camoffx = _this select 0

_camoffy = _this select 1

_helo = _this select 2

_cam1 = "camera" camcreate [0,0,0]

_cam1 cameraeffect ["internal", "back"]

_cam1 camsettarget cameraeffect1

_cam1 camsetrelpos [0,0,0]

_cam1 camcommit 0

#start

//If this is not the server machine then goto the loop that

//waits for the server to finish the maths.

?not local server : goto "checkserverready"

_BankPitch = _helo call GetBankPitch

_Pitch = _BankPitch select 1

_sinangle = sin(_Pitch)

_cosangle = cos(_Pitch)

;evaluate where camsetrelpos command should set the camera to for _camoffy

e = (_sinangle) * (_camoffy)

a = (_cosangle) * (_camoffy)

//broadcast the camsetrelpos variables to the client(s).

publicvariable "a"

publicvariable "e"

;get heading of helicopter and evaluate x and y offsets for the game logics for _camoffx

_heading = getdir _helo

_angle = 360 - _heading

_xa = (cos (_angle)) * _camoffx

_ya = (sin (_angle)) * _camoffx

;Get position co-ordinates of helicopter

_xh = getpos _helo select 0

_yh = getpos _helo select 1

//The interesting bit. Will this automatically update the

//game logics' positions on the client?

;Position the game logics

cameraeffect2 setpos [(_xh + _xa),(_yh + _ya),0]

_dist = _helo distance cameraeffect2

_height = sqrt ((_dist^2)-(_camoffx^2))

cameraeffect1 setpos [(_xh + _xa),(_yh + _ya),_height]

cameraeffect1 setdir _heading

logiccomplete = true

//Client waits for server to finish then camsetrelpos variables

//are issued.

#checkserverready

?logiccomplete : goto "camerapositioning"

goto "checkserverready"

#camerapositioning

_cam1 camsetrelpos [0,a,e]

_cam1 camcommit 0

~0.001

logiccomplete = false

?camend : goto "finish"

goto "start"

#finish

_cam1 CameraEffect ["TERMINATE", "BACK"]

CamDestroy _cam1

exit

[killswitch 19]

There's no need to get bogged down in the script too much all I need to know is because game logic units are always local to the server, does this mean that their positions are always defined on the server and broadcast to the clients? Or, do I have to instruct the client machine(s) to change the postions of the game logics too, or can I just get away with altering their positions on the server?

The latter - you only change the position of an entity on the machine said entity is local to. In your case it means - alter the positions only on the server.

[chris330 0]

Quality

Then that means my script should work (says that knowing really that it won't for some reason)