Spring RTS Engine

Posted: **16 Feb 2017, 14:38**

Heya, I've a simple custom command set up that issues raw move orders, mostly copied from ZK's https://github.com/ZeroK-RTS/Zero-K/blo ... w_move.lua

The issuing looks like so:

Code: Select all

Spring.SetUnitMoveGoal(unitID, cmdParams[1],cmdParams[2],cmdParams[3],64,nil,true)

And it works. But once the order finishes, the unit starts circling, instead of coming to a full stop.

This is the original ZK code + my modification for the command callins:

Code: Select all

function gadget:UnitCmdDone(unitID, unitDefID, unitTeam, cmdID, cmdTag)

	if (cmdID == CMD_RAW_MOVE) then

		Spring.Echo("Unit cmd done")

        Spring.ClearUnitGoal(unitID)

        spGiveOrderToUnit(unitID, CMD.STOP, {}, {})

    else

        return false

    end

end



function gadget:CommandFallback(unitID, unitDefID, teamID, cmdID, cmdParams, cmdOptions) -- Only calls for custom commands

	if (cmdID ~= CMD_RAW_MOVE) then

		return false

	end



	local x, y, z = spGetUnitPosition(unitID)

	local distSqr = GetDistSqr({x, y, z}, cmdParams)

	if (distSqr > (64)) then

		return true, false -- command was used but don't remove it(unit have not reach destination yet)

	else

        --spGiveOrderToUnit(unitID, CMD.STOP, {}, {})

        Spring.Echo("Removing cmd..")

		return true, true -- command was used, remove it (unit reached destination)

	end

end

UnitCmdDone gets called as appropriate, but the orders issued within it seem to not do much anything.

Ideas for how to stop the unit after SetUnitMoveGoal finishes?

Posted: **16 Feb 2017, 16:12**

I would append that this is not trivial problem if we consider fact, that engine is not 100 % reliable in reporting commands finished. The failure rate based on our experiments is that at least 1 command in 10000 is not reported properly as finished.

If you consider Spring engine as a black box you cannot trust :) there are some ways you can still do as a user of this black box. Here are 7 steps we used for estimating that robots group move was finished. It was used during the NOE AI framework development around 2012 and we returned to this problem few months ago as part of the BETS project:

Next is the evolution of the function of the "group move in formation completed" event on lua scripters side.

1. add tolerance for all members from target positions
2. not all members need to be in position, just pointman
3. not all members need to be in position, just some percent
4. avg distance of all members is smaller than...
5. avg distance smaller than + distance of the most distant member smaller than...
6. logic of iteration 5 + timeout
7. logic of iteration 5 + specific handling of hilly areas and unreachable points

As I stated somewhere, evaluation function around 4-5th level starts to be robust enough for the most of the usecases.

If your problem is really just stopping the unit, do not use SetUnitMoveGoal and use normal CMD.MOVE.

Posted: **16 Feb 2017, 16:22**

For internal reasons, only a new regular move command can stop a unit after using raw movement.

Posted: **16 Feb 2017, 16:27**

PepeAmpere wrote:If your problem is really just stopping the unit, do not use SetUnitMoveGoal and use normal CMD.MOVE.

The thing is that I want to invoke StartMovingRaw, which is called by SetUnitMoveGoal if the last parameter is 'true'. The idea is to skip the whole pathfinder.

And it otherwise works, just that I can't figure out how to bring the unit to a halt once it reaches its goal and the command is removed. :)

Kloot wrote:For internal reasons, only a new regular posting.php?mode=quote&f=23&p=581203move command can stop a unit after using raw movement.

Ah, hm. I'll try what happens if I just tell it to go to its current location..

Posted: **16 Feb 2017, 16:34**

tzaeru wrote:
Kloot wrote:For internal reasons, only a new regular posting.php?mode=quote&f=23&p=581203move command can stop a unit after using raw movement.
Ah, hm. I'll try what happens if I just tell it to go to its current location..

Woo, it works exactly as intented. Thanks, Kloot!

Still a few problems in queuing multiple such commands (it seems to always go for the last goal, but CommandFallback gets 1st goals parameters) but I think those are purely related to how BA itself handles order queues and the like.

Spring RTS Engine

Unit circles idly after SetUnitMoveGoal completes

Unit circles idly after SetUnitMoveGoal completes

Re: Unit circles idly after SetUnitMoveGoal completes

Re: Unit circles idly after SetUnitMoveGoal completes

Re: Unit circles idly after SetUnitMoveGoal completes

Re: Unit circles idly after SetUnitMoveGoal completes