Jamming ability should reset when vision of unit is lost

Identify a Problem

A unit with a jammer produces (radar) blips that are fake. These radar blips can be used to trick enemy weaponry. The radar blips disappear when you have vision over the fake radar blips.

At the moment the radar blips do not automatically respawn when you lose vision over the unit. What a lot of people do not know (including me up to a few weeks ago) is that they do respawn when you manually toggle the jamming ability on / off. They also respawn when you lose / gain power.

This is a manual interaction that is unintuitive as it is impossible for you to know whether the blips are gone or not: they are only visible to your opponents.

Showcase the Problem

The current behavior can be sandboxed using a radar, a few scouts and a few sparkies. You can switch between armies using the cheat menu. Once you've scouted the sparkies the blips disappear and they do not come back. If you disable / enable the jamming device then they are back again.

Find a Solution

We can automatically reset the jammer once the unit is out of vision. This has been suggested seven years ago:

• https://github.com/FAForever/fa/issues/968

I'll make sure that this is done such that it is responsive, but that it doesn't impacting the performance of the game.

Justify the Solution

It automates a behavior that is only possible to do manually, without knowing when you should do it.

Jamming is not that useful once you scouted the initial unit which causes blips. Is it also possible to "refresh" the icon of initial unit once the vision is lost on it?

Aka worse stealth: you know that unit is somewhere in area, but don't know where exactly to manually target it.

Is it also possible to "refresh" the icon of initial unit once the vision is lost on it?

I'm looking into this - but that is not going to be part of this suggestion. That would be a separate suggestion once I've confirmed that it is possible .

Maybe instead of having it refresh after disappearing from vision it could basically toggle itself off and on every 5-10s? Sounds like it could be easier to do than making sure unit was out of vision for a certain period of time, though again having 100's of frigates do it every 5-10s sounds like a small tactical attack aimed at performance.

But now that I think about it, it could lead to unwanted behaviour of the main units being targeted while the on/off switch is being performed and alas still making it kinda useless during actual fight as long as main blip remains a target to enemy weaponry due to the off/on loop being performed.

@e33144211332424 said in Jamming ability should reset when vision of unit is lost:

though again having 100's of frigates do it every 5-10s sounds like a small tactical attack aimed at performance.

It is not.

The complexity (with respect to the input) is linear. We denote that as O(n) . Linear algorithms are usually a good candidate when you're on a budget (and we are).

Some of the performance improvements that we've been having is because there were operations implemented using a complexity O(nlg(n)) or O(n^2) while there was an O(n) or even an O(1) implementation possible. To give you an idea of the growth, see these graphs:

See also on desmos

To pick one x coordinate on the graph: if we have 100 (n = 100) units then it takes the algorithm:

• O(n) = 100 steps
• O(nlg(n)) = ~664 steps
• O(n^2) = 10.000 steps

This is by all means a simplification - there's still a constant factor that can make things expensive. But jamming is not one of those.

@jip You just need to enable stealth for a couple ticks once in a while so main unit disappears from radar...