Parachute - Add failure chance

[JoramD0]

When merged this pull request will:

• Add setting to enable percentage based failing of parachutes (0% chance by default).
• Add config value to ParachuteBase to set the failure delay.
• Add documentation for the config value mentioned above.

This was a request from @DevastatorCM

A small demo

[BrettMayson]

I think it'd be neat if the parachute could be faulty, rather than just get cut

[DevastatorCM]

It would be nice if there were some variables which effects the failure ratio given initialy. For instance

• altitude of opening (or player's dive speed) . Assumption here is HAHO where lets say player opens the chute above 1500-2000m and as air density lets say is low, speed of the dive is high and it can increase the chance of failure
• body position: if player is not stable but diving (via "W") chance to failure increases due to wrong body position
• hit to an object or another player while chute is open: Tangles the chute so failure rate if such hit happens to the chute is 100%

[JoramD0]

@DevastatorCM

• Possible however not worth it since it is a very specific case.
• Can't think of a way to do that without impacting performance for such a small feature.
• Technically not possible as far as I'm aware.

[DevastatorCM]

1- This one is the easy one I think. Simple multiplier of the AGL value when chute is opened
2- This one can be done by checking if move forward key is being pressed when the open chute action kicked in
3- I didnt chek this but if chute is an object, then https://community.bistudio.com/wiki/Arma_3:_Event_Handlers#EpeContact can be used on the chute maybe

[JoramD0]

@DevastatorCM You can always open a PR yourself, I currently don't have the time/want to implement all that (if even possible without a performance impact).

[Drofseh]

I think this should really add some options for a backup chute.

Right now all this seems to do is provide a random chance to ruin a player's experience by killing them at mission start.

[TheCandianVendingMachine]

I think this should really add some options for a backup chute.

Right now all this seems to do is provide a random chance to ruin a player's experience by killing them at mission start.

There is already reserve chutes within ACE, unless if I am misunderstanding you https://github.com/acemod/ACE3/blob/master/addons/parachute/CfgVehicles.hpp

[JoramD0]

@Drofseh
Do you mean adding a backup parachute or the option to only have the primary parachute fail?

[jokoho48]

I think this should really add some options for a backup chute.
Right now all this seems to do is provide a random chance to ruin a player's experience by killing them at mission start.

There is already reserve chutes within ACE, unless if I am misunderstanding you https://github.com/acemod/ACE3/blob/master/addons/parachute/CfgVehicles.hpp

yes there is a backup chute: https://github.com/acemod/ACE3/blob/master/addons/parachute/functions/fnc_handleReserve.sqf
it is very old code though. i think one of the first thing I did for ace3

[Drofseh]

Oh interesting, I didn't even know that existed. If the backup chute is already automatically available then that's great.

[PabstMirror]

Maybe in a future PR we could add a sound effect or some way of communicating to the player that their parachute failed

[commy2]

Lgtm, without having tested this.

One minor gripe I have with this is the function name handleFailureChance. handleX implies to me that there is some kind of event handler involved:
handle<Event> like handleInfoDisplayChanged for ACE_InfoDisplayChanged.

[commy2]

Since you're using getNumber, the token can also be a simple expression string:

        ace_parachute_failureDelay = "1 + random 2";

This will be evaluated every time the getNumber command is used.

[commy2]

(because there is no automatic type conversion in Arma :^)

[JoramD0]

Cool, did not know that was possible. The value however is intentionally set to 2, it's the point air starts getting under the main parachute (which I think could cause a rope to fail due to the force applied on it).