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Physics stabilizer plugin for Kerbal Space Program
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README.md

README.md

Kerbal Joint Reinforcement, v3.3.3

Physics stabilizer plugin for Kerbal Space Program

Source available at: https://github.com/ferram4/Kerbal-Joint-Reinforcement


****** INSTALLING KERBAL JOINT REINFORCEMENT ******


Merge the GameData folder with the existing one in your KSP directory. KSP will then load it as an add-on. The source folder simply contains the source code (in C#) for the plugin. If you didn't already know what it was, you don't need to worry about it; don't copy it over.


****** EXCITING FEATURES! ******


-- Physics Easing

- Slowly dials up external forces (gravity, centrifugal, coriolis) when on the surface of a planet, reducing the initial stress during loading
- All parts and joints are strengthened heavily during physics loading (coming off of rails) to prevent Kraken attacks on ships

-- Launch Clamp Easing

- Prevents launch clamps from shifting on load, which could destroy the vehicle on the pad

-- Stiffen interstage connections

- Parts connected to a decoupler will be connected to each other, reducing flex at the connection to reasonable levels

-- Stiffen launch clamp connections

- Less vehicle movement on vessel initialization
- Warning: may cause spontaneous rocket disintegration if rocket is too large and overconstrained (far too many lanuch clamps; their connections will fight each other and give rise to phantom forces)

-- Increase stiffness and strengths of connections

- Larger parts will have stiffer connections to balance their larger masses / sizes
- Sequential parts in a stack will be connected with a stiff, but weak connection to add even more stiffness and counteract wobble

-- Option to make connection strengths weaker to counteract increases in stiffness

-- Joint Stiffness parameters can be tweaked in included config.xml file

- config value documentation:

General Values

Type	Name					Default Value		Action

bool	reinforceAttachNodes			1			--Toggles stiffening of all vessel joints
bool	multiPartAttachNodeReinforcement	1			--Toggles additional stiffening by connecting parts in a stack one part further, but at a weaker strength
bool	reinforceDecouplersFurther		1			--Toggles stiffening of interstage connections
bool	reinforceLaunchClampsFurther		1			--Toggles stiffening of launch clamp connections
bool	useVolumeNotArea			1			--Switches to calculating connection area based on volume, not area; not technically correct, but allows a better approximation of very large rockets
bool	debug					0			--Toggles debug output to log; please activate and provide log if making a bug report
float	massForAdjustment			0.01			--Parts below this mass will not be stiffened
float	stiffeningExtensionMassRatioThreshold	5			--Sets mass ratio needed between parts to extend Decoupler Stiffening one part further than it normally would have gone; essentially, if the code would have stopped at part A, but part B that it is connected to is >5 times as massive as part A, include part B
float	decouplerAndClampJointStrength		-1			--Sets breaking strength for joints involved in decoupler and clamp additional strengthening; -1 makes them unbreakable

Angular "Drive" Values (universally scales angular strength of connections)

Type	Name				Default Value		Action

float	angularDriveSpring		5e12			--Factor used to scale stiffness of angular connections
float	angularDriveDamper		25			--Factor used to scale damping of motion in angular connections
float	angularMaxForceFactor		-1			--Factor used to scale maximum force that can be applied before connection "gives out"; does not control joint strength; -1 makes this value infinite

Joint Strength Values

Type	Name				Default Value		Action

float	breakForceMultiplier		1			--Factor scales the failure strength (for forces) of joint connections; 1 gives stock strength
float	breakTorqueMultiplier		1			--Factor scales the failure strength (for torque) of joint connections; 1 gives stock strength
float	breakStrengthPerArea		1500			--Overrides above values if not equal to 1; joint strength is based on the area of the part and failure strength is equal to this value times connection area
float	breakTorquePerMOI		6000			--Same as above value, but for torques rather than forces and is based on the moment of inertia, not area

Part and Module Exemptions

Type	Name				Default Value		Action

string	exemptPartType0			MuMechToggle		--Part stiffening not applied to this type of "Part"; exemption to avoid interference with Infernal Robotics
string	exemptPartType1			MuMechServo		--Part stiffening not applied to this type of "Part"; exemption to avoid interference with Infernal Robotics

string	exemptModuleType0		WingManipulator		--Part stiffening not applied to parts with this type of PartModule; exemption to prevent problems with pWings
string	exemptModuleType1		SingleGroupMan		--Part stiffening not applied to parts with this type of PartModule; exemption to prevent problems with procedural adapter included with pWings
string	exemptModuleType2		KerbalEVA		--Part stiffening not applied to parts with this type of PartModule; exemption to prevent problems with Kerbals in command seats
string	exemptModuleType3		MuMechToggle		--Part stiffening not applied to parts with this type of PartModule; exemption to prevent problems with Kerbals in command seats
string	exemptModuleType4		WingProcedural		--Part stiffening not applied to parts with this type of PartModule; exemption to prevent problems with Kerbals in command seats

Further part and module exemptions can be added using the same formating and changing the number

Decoupler Stiffening Extension Types

Type	Name					Default Value		Action

string	decouplerStiffeningExtensionType0	ModuleEngines		--Decoupler stiffening will look for parts beyond this part type to add to stiffening
string	decouplerStiffeningExtensionType1	ModuleEnginesFX		--Decoupler stiffening will look for parts beyond this part type to add to stiffening
string	decouplerStiffeningExtensionType2	ModuleHybridEngine	--Decoupler stiffening will look for parts beyond this part type to add to stiffening
string	decouplerStiffeningExtensionType3	ModuleHybridEngines	--Decoupler stiffening will look for parts beyond this part type to add to stiffening
string	decouplerStiffeningExtensionType4	ModuleEngineConfigs	--Decoupler stiffening will look for parts beyond this part type to add to stiffening

These types are currently not used, but removing the a in front of them will cause KJR to make use of them again; their lack should not affect stiffening appreciably but does help reduce overhead and strange stiffening situations

string	adecouplerStiffeningExtensionType5	ModuleDecouple		--Decoupler stiffening will look for parts beyond this part type to add to stiffening
string	adecouplerStiffeningExtensionType6	ModuleAnchoredDecoupler	--Decoupler stiffening will look for parts beyond this part type to add to stiffening
string	adecouplerStiffeningExtensionType7	ProceduralFairingBase	--Decoupler stiffening will look for parts beyond this part type to add to stiffening

****** CHANGELOG ******


v3.3.3
Features
--Recompile against KSP 1.3, ensure CompatChecker compatibility with 1.3

v3.3.2
Bugfixes
--Fix multijoints breaking IR joints and any other exempted parts from moving

v3.3.1
Bugfixes
--Fix a critical bug involving unphysical forces applied to vessels on load / unload of other vessels and SOI switches

v3.3.0
Features
--Recompile to fix for KSP 1.2
--Update method of handling multi-part-joints to ensure compatibility with Konstruction mod
--Removal of old symmetry-based multi-part stabilization due to ineffectiveness in all situations to reduce overhead
--Implementation of new vessel-part-tree leaf-based stabilization for greater stability on space stations and other convoluted shapes

v3.2.0
Features
--Recompile to ensure KSP 1.1.3 compatibility
--Change multi-part-joint system to stabilize space stations and similar vehicles with very large masses connected by very flexy parts

v3.1.7
Features
--Recompile to ensure KSP 1.1.2 compatibility, especially within CompatibilityChecker utility

v3.1.6
Features
--Update to ensure KSP 1.1.1 compatibility
--Minor optimization in joint setups
--Remove B9 pWings from stiffening exemption, as it is unnecessary

v3.1.5
Features
--Updated to be compatible with KSP 1.1
--Very minor efficiency improvements in physics easing and stiffening of joints
--Fully exempt EVAs from all KJR effects
--Update config parameters to function with stock fixing of never-breakable joints bug

v3.1.4
Misc
--Fixed issue with .version file and compatible KSP versions

v3.1.3
Features
--Updated compatibility for KSP 1.0

v3.1.2
Features
--Added code to slightly stiffen connections between symmetrically-connected parts attached to a central part; should reduce some physics weirdness

BugFixes  
--Fixed issue where undocking was impossible.

v3.1.1
BugFixes
--Fixed a serious lock-to-worldspace issue involving multipart joints and physicsless parts

v3.1
Features
--Set multipart joints to account for large mass ratios in choosing which parts to join
--Set Decoupler Stiffenning to require the connection of immediate decoupler children to stiffen things even further

BugFixes  
--Fixed a decoupling issues with multipart joints  
--Fixed multipart joint lock-to-worldspace issues  
--Fixed some issues on loading very large, heavy parts

v3.0.1
BugFixes
--Fix some issues involving multipart joints
--More null checking for situations that shouldn't happen, but might

v3.0
Features
--MultiPart joints: weak, but stiff connections along a stack that will add even more stiffness without making the connection cheatingly strong
--Proper, guaranteed application of stiffened properties, regardless of stock joint parameters
--Updated default config values for greater sanity
--Refactoring of code for sanity

BugFixes
--Longstanding issue with radially-attached parts that were larger than their parent are now fixed  
--Many NREs from bad events or bad states now avoided

v2.4.5 Features --KSP 0.90 compatibility --Include some extra checks to prevent errors from occurring

v2.4.4 Features --KSP 0.25 compatibility
--Update CompatibilityChecker
--Shutdown functionality if CompatibilityChecker returns warnings

v2.4.3 Features --KSP 0.24.2 compatibility

v2.4.2 Features --KSP 0.24.1 compatibility

v2.4.1

Bugfixes:
--Included JsonFx.dll, which is required by ModStats
--Relabeled ModStatistics.dll to allow simple overwriting for ModStats updates

v2.4

Features
--KSP 0.24 compatibility

Bugfixes
--Fixed some interference with infernal robotics

v2.3

Features
--Updated attach node reinforcement to use properties closer to stock joint performance, but stiffer.
--Decoupler and clamp stiffening increased in strength for use in Real Solar System
--Removed unused config values

v2.2

Features
--Updated to function with KSP ARM Patch (KSP 0.23.5)
--Removed inertia tensor fix, as it is now stock
--Main stiffening / strengthening is now disabled by default due to stock joint improvements
--Decoupler stiffening is now disabled by default due to stock joint improvements

Bugfixes:
--Vessels can no longer become permanently indestructible

v2.1

Features
--Reduced extent of decoupler stiffening joint creation; this should reduce physics overhead
--Code refactoring for additional performance gains
--Removed physics easing effect on inertia tensors; was unnecessary and added more overhead
--Workaround for the stock "Launch Clamps shift on the pad and overstress your ship" bug that is particularly noticeable with RSS
--Clamp connections are stiffer; now allowed by above workaround

Bugfixes
--KAS struts no longer break on load

v2.0

Features
--Full release of proper inertia tensors!  Massive parts will feel more massive.
--Full release of greater physics easing!  Landed and pre-launch crafts will have gravitational, centrifugal and coriolis forces slowly added to them, reducing the initial physics jerk tremendously
--Launch clamps are now much stiffer when connected to more-massive-than-stock mod parts
--Tightened up default joint settings more
--Decoupler Stiffening Extension will now extend one part further if it's final part is much less massive than its parent / child part
--Added Majiir's CompatibilityChecker; this will simply warn the user if they are not using a compatible version of KSP

Bugfixes
--Joints during physics easing strengthened

v2.0x2

Features
--Elaborated physics easing: joints' flexion range is initially great and decreases, and gravitational + rotating ref frame forces are cancelled out to resolve internal joint stresses ere loading the rocket
--Greatly tightened default joint settings

Bugfixes
--Non-zero angular limits no longer wrongly reorient parts.

v2.0x1

Features
--Fixed part inertia tensors: heavy, large objects should now "feel" more massive, and their connections should better behave. Thanks to a.g. for finding this one.
--Slightly stiffened Launch Clamps
--Removed v1.7's improper stiffening for stretchy tanks, which the ability to stretch stretchy tanks makes unnecessary

Bugfixes
--Non-zero angular limits no longer wrongly reorient parts.

v1.7

Features
--Connection area can be from volume instead of connection area calculated; for very, very large vehicles that the standard settings cannot handle
--Default joint parameters stiffened
--Stretchy tanks stiffened--a better solution is being developed while this one helps RSS

Bugfixes
--Decoupling no longer further stiffens joints being deleted from non-staged decouplers during decoupling / partial crashing

v1.6

Features
--BreakStrengthPerUnitArea will not override large breakForces, easing I-beams and structural elements' use

Bugfixes
--Fixed decoupler-dockingport combination parts from causing strange disassembly when undocking

v1.5

Features
--Updated to KSP 0.23
--Joint breaking strength can be set to increase with connection area so that large part connections can have realistically large strength; on by default
--Vessels are further strengthened for the first 30 physics frames after coming off rails or loading, reducing initialization jitters.

Bugfixes:
--Launch clamps after staging remain clamped to the ground.
--Kraken no longer throws launchpads at orbiting craft

v1.4.2

Bugfixes
--Wobble reduced
--General tweaks to reduce wobbling further

v1.4.1

Bugfixes
--Maximum joint forces correctly calculated
--Docking no longer causes exceptions to be thrown and cause lag

v1.4

Features
--Increased calculation of surface-attached connection area's accuracy

Bugfixes
--Wobble between stack-attached parts of very different sizes greatly reduced

v1.3

Features
--Better solution for failure to apply decoupler ejection forces
--Will not stiffen parts below a given mass, which can be changed in config
--Properly updates on docking

Bugfixes
--Launch clamps no longer to the surface lock ships

v1.2

Features
--Workaround for stock KSP bug where struts would prevent decoupler ejection forces from being applied

Tweaks
--Reduced default maxForceFactors to be more reasonable levels

BugFixes
--Struts properly disconnect
--Decouplers properly function

v1.1

Features
--Stiffness of joint no longer erroneously dependent on breakForce / breakTorque
--Decoupler stiffening function made more comprehensive

BugFixes
--Further decoupler stiffening affects radial decouplers
--Decoupler further stiffening no longer causes Nulls to be thrown when attached to physics-disabled parts
--Procedural fairings no longer locked to rockets
--Infernal Robotics parts function
--Temporary stopgap measure: stiffening not applied to pWings to prevent ultra-flexy wings

Known Issues
--Decouplers exert no detach force with extra decoupler stiffening enabled
Same issues as strut attachment bug

v1.0

Release
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