Rescales the engines of SSTUlabs (http://forum.kerbalspaceprogram.com/index.php?/topic/117090-wip112-sstulabs-low-part-count-solutions-orbiter-landers-lifters-dev-thread-06-11-16/) to fit the scale of the KScale64 Mod

EngineRescale.cfg

//Manual Configs

KATIA_RESCALECONFIG																		//All names start with KATIA_ to avoid possible conflicts with other mods that might want to change the scale of things...
{
	name = Default
	engineScaleFactor = 1.5																//This factor works well for the F-1 engine. May need more intricate adjustments
}

KATIA_RESCALECONFIG
{
	name = Merlin
	engineScaleFactor = 1.3																//This factor needs to bit smaller to fit 9 engines on a 3.7m stage
	thrustScaleFactor = 1.4																//Also, the engine seems a bit underpowered for its size. Increasing the thrust makes it fit in better
}

//Calculating additional values

@KATIA_RESCALECONFIG[*]
{
	thrustScaleFactor = #$engineScaleFactor$											//creates the value thrustScaleFactor to scale the thrust with the engine's zize. This creates a duplicate thrustScaleFactor if it's defined above. That should not be a problem, as MM always works with the first defined value unless told else.
	@thrustScaleFactor,0 != 2															//squares thrustScaleFactor, so that thrust increases proportionally with nozzle area. Uses the first thrustScaleFactor, just to be sure.
}

//Selecting parts
@PART[*]:HAS[@MODULE[SSTUModularEngineCluster]]:After[SSTU]
{
	KATIA_RESCALER
	{
		engineScaleFactor = #$@KATIA_RESCALECONFIG[Default]/engineScaleFactor$
		thrustScaleFactor = #$@KATIA_RESCALECONFIG[Default]/thrustScaleFactor$			//Takes the engineScaleFactor and thrustScaleFactor defined in the default rescaleconig above and applies them to the matching parts. 
	}
}

@PART[SSTU-SC-ENG-Merlin-*]:HAS[@MODULE[SSTUModularEngineCluster]]:After[SSTU]
{
	%KATIA_RESCALER
	{
		%engineScaleFactor = #$@KATIA_RESCALECONFIG[Merlin]/engineScaleFactor$
		%thrustScaleFactor = #$@KATIA_RESCALECONFIG[Merlin]/thrustScaleFactor$
	}
	
	@tags ^= :$:, merlin:																//For some reason the Merlin engines can't be found through the integrated search. Adding this tag to the part should fix that.
}

//Applying the Patches
@PART[*]:HAS[@KATIA_RESCALER]:FINAL
{
	@description ^= :$: Rescaled to fit the larger solar system scale.:
	
	@MODULE[SSTUModularEngineCluster]
	{
		@engineScale *= #$../KATIA_RESCALER/engineScaleFactor$							//this moves up a node (from MODULE[SSTUModularEngineCluster] to PART) and selects the engineScaleFactor saved in KATIA_RESCALER on the same part. The part's default value should be 1, so multiplying and overwriting should do the same, but multiplying is more flexible. 
	}
	@MODULE[ModuleEnginesFX]
	{
		@maxThrust *= #$../KATIA_RESCALER/thrustScaleFactor$							//Same as with engineScaleFactor, but this time the thrust has to be multiplied , or else it will be absolutely tiny.
	}																					//The engine's mass wil be ignored for now, as SSTU seems to have chosen relatively high but arbitrary values fot that.
}

//Cleanup
@PART[*]:HAS[@KATIA_RESCALER[*]]:FINAL
{
	!KATIA_RESCALER[*] {}																//deletes the nodes containing the rescale after finished work data from the parts to reduce clutter.
}




//Notes

//I split the patches in the way I did to allow for greater flexibility when changing the parts' values. Should I decide I want to tinker with the mass or heat production of some of the engines for example, I can easily add the appropriate patches without having to add tem to every engine.
//Also, should I decide I want to tweak other engines in the future, this can easily achieved by adding the code to the 'applying the patches' section without having to rework the other parts.