Data Assets

WaveDataAsset

UDRW_WaveDataAsset

Purpose: Configures ocean wave physics: spectrum type, wind, damping, amplitude, and WPO.

Used by: GridManager (WaveDataAsset property).

Properties

Property	Type	Default	Range	Description
DisplayName	FText	:	:	Human-readable name.
Description	FText	:	:	Description text.
bEnableFFT	bool	true	:	Enable FFT simulation.
SpectrumType	enum	Phillips	:	Phillips, Pierson-Moskowitz, or JONSWAP.
WindSpeed	float	25.0	1–80	Wind speed (m/s).
WindDirection	FVector2D	(1, 1)	-1 to 1	Wind direction.
WaveAmplitude	FVector4	(4 ×4)	0–64	Wave strength per cascade.
SmallWaveDamping	FVector4	(4, 2, 1, 0)	0–64	Short wave damping per cascade.
LargeWaveDamping	FVector4	(0.25, 2, 4, 6)	0–64	Long wave damping per cascade.
WindInfluence	FVector4	(1 ×4)	0–16	Wind alignment.
OpposingWaveFactor	FVector4	(0.125, 0.25, 0.5, 1)	0–128	Counter-wind wave reduction.
PatchLength	FVector4	(6400 ×4)	0–16384	Cascade patch size.
DomainSize	FVector4	(6, 7, 8, 6)	0–16384	Domain size.
WPOStrength	FVector4	(1 ×4)	0–10	World position offset per cascade.
WPODirection	FVector	(1, 1, 1)	-1 to 1	WPO direction.
NormalStrength	float	40.0	1–128	Surface normal intensity.
DetailNormalStrength	float	0.25	0–128	Detail normal layer.
DetailNormalTiling	float	32.0	0–512	Detail normal UV tiling.
JONSWAP only
Gamma	FVector4	(3.3 ×4)	1–10	Peak enhancement factor.
Alpha	FVector4	(0.076, 0.114, 0.152, 0.228)	0.001–1	Energy scaling.
PeakOmega	FVector4	(0.7, 1.1, 1.6, 2.5)	0.1–10	Peak frequency.
SigmaLow / SigmaHigh	FVector4	0.07 / 0.09	0.01–0.5	Spectral width.
Pierson-Moskowitz only
PMAlpha	FVector4	(0.048, 0.048, 0.064, 0.096)	0.001–1	PM energy scaling.
PMPeakOmega	FVector4	(1, 1.5, 2, 4)	0.1–10	PM peak frequency.

VisualDataAsset

UDRW_VisualDataAsset

Purpose: Configures ocean visual appearance: lighting, color, foam, caustics, depth, underwater effects, and color correction.

Used by: GridManager (VisualDataAsset property).

Properties

Property	Type	Default	Range	Description
Lighting
Roughness	float	0.2	0–1	Surface roughness.
Specular	float	1.0	0–1	Specular intensity.
Anisotropy	float	0.2	0–1	Reflection stretching.
SurfaceSpecular	float	4.0	0–16	Glancing angle specular.
Phase / Phase2	float	0.8 / -0.2	-1 to 1	Scattering phase.
Refraction	float	1.033	1–5	Refraction index.
Color
AbsorptionColor	FLinearColor	(0.193, 0.092, 0.090)	:	Absorption color.
Absorption	float	0.065	0.001–1	Absorption rate.
ScatteringColorStrength	float	3.0	0–4	Scattering color.
BaseColorStrength	float	2.0	0–4	Base color influence.
HueShift	float	-60.0	-180 to 180	Hue rotation.
GeneralStrength	float	64.0	0–64	Ambient / backside.
Foam
FoamAlphaContrast	float	-0.1	-1 to 1	Foam mask contrast.
FoamStrength	float	1.5	0–16	Foam intensity.
FoamColor	FLinearColor	(0.727, 0.816, 1.0)	:	Foam tint.
Caustics
CausticsStrength	float	1.0	0–10	Caustics intensity.
CausticsChromatic	float	0.3	0–1	Chromatic aberration.
Underwater
BlurIntensity	float	1.0	0–10	Underwater blur.
DepthIntensity	float	2000.0	0–100000	Depth fog distance.
DistanceIntensity	float	20000.0	0–100000	Distance fog.
VignetteIntensity	float	1.3	0–10	Vignette strength.
Color correction
Offset / Gain / Brightness / Contrast / Saturation	FLinearColor	identity	:	Post-process color grading.

Additional categories

Beyond the headline tables above, VisualDataAsset exposes finer-grained tuning categories: sensible defaults are baked in, edit only when you need control:

Color extras: AmbientStrength, BacksideStrength, PeakWaveHeight, PeakWaveStrength, BaseColorStrength.
Foam extras: FoamNormalStrength.
Caustics extras: CausticsInteractionStrength.
Depth extras: DepthNormalStrength, DepthFoamStrength.
Smoothing: NormalSmoothing, RoughnessSmoothing, SpecularSmoothing (soften LOD-transition popping).
LOD Transition: six fields biasing the colour blend across cascade layers.
Underwater extras: CausticsDepthIntensity, CausticHueShiftIntensity, CausticsStrengthIntensity, ColorIntensity, ColorHueShiftIntensity, RefractionIntensity.

These categories don’t exist on WBVisualDataAsset (water bodies have a smaller surface: no LOD cascades).

WBVisualDataAsset

UDRW_WBVisualDataAsset

Purpose: Visual appearance for discrete water bodies (pools, lakes). A flat, calm-water variant of VisualDataAsset.

Used by: WaterBody base class (VisualData property).

Shared with VisualDataAsset (same defaults): Lighting category (Roughness, Specular, Anisotropy, SurfaceSpecular, Phase, Phase2, Refraction); core Color category (AbsorptionColor, Absorption, ScatteringColorStrength, BaseColorStrength, HueShift, GeneralStrength, AmbientStrength, BacksideStrength); core Foam (FoamAlphaContrast, FoamStrength, FoamNormalStrength, FoamColor); core Caustics (bEnableCaustics, CausticsStrength, CausticsChromatic); Color Correction (Offset, Gain, Brightness, Contrast, Saturation); full Underwater set (BlurIntensity, CausticsDepthIntensity, CausticHueShiftIntensity, CausticsStrengthIntensity, ColorIntensity, ColorHueShiftIntensity, DepthIntensity, DistanceIntensity, RefractionIntensity, VignetteIntensity).

Different from VisualDataAsset:

Property	Type	Default	Range	Description
NormalStrength	float	8.0	0–16	Surface normal (much lower than ocean’s 40: water bodies are calmer).
DetailNormalStrength	float	1.0	0–16	Detail normal layer.
DetailNormalTiling	float	1.0	0.01–100	Detail tiling.

Not present on WBVisualDataAsset (these are ocean-only): the wave-driven Color extras (PeakWaveHeight, PeakWaveStrength), CausticsInteractionStrength, the Depth category (DepthNormalStrength, DepthFoamStrength, etc.), the Smoothing category, the LOD Transition category. Pools and lakes don’t have wave cascades, depth-driven shoreline shaping, or LOD transitions, so these tunables don’t apply.

InteractionDataAsset

UDRW_InteractionDataAsset

Purpose: Configures water interaction effects: ripple, wake, splash parameters, decay, and output limits.

Used by: GridManager, WaterBody, InteractionSubsystem.

Properties

Property	Type	Default	Range	Description
General
OverallIntensity	float	1.0	0.01–10	Master multiplier.
DisplacementStrength	float	1.0	0–5	Height displacement.
FoamGenerationMultiplier	float	1.0	0–10	Foam across all types.
Ripple
RippleHeightScale	float	0.03	0.001–1	Ripple height impulse.
RippleVelocityScale	float	0.06	0.001–1	Ripple velocity impulse.
MaxRippleRadius	float	200.0	50–1000	Max ripple radius (cm).
RippleStampDuration	float	0.15	0.01–1	Impulse duration (seconds).
RippleLargeObjectReduction	float	0.7	0–1	Intensity reduction for large objects.
Wake
KelvinWakeAngle	float	19.47	5–45	Wake half-angle (degrees). Physical default: 19.47.
WakePatternStrength	float	0.8	0–2	V-pattern displacement.
BowWaveStrength	float	0.5	0–2	Bow wave displacement.
WakeEdgeFoamStrength	float	0.8	0–2	Hull edge foam.
WakeFoamMultiplier	float	1.0	0–5	Wake foam output.
Splash
SplashHeightScale	float	0.04	0.001–1	Impact height impulse.
SplashVelocityScale	float	0.08	0.001–1	Impact velocity impulse.
SplashImpulseDuration	float	0.2	0.01–1	How long an impact splash impulse keeps emitting (seconds).
SplashFoamMultiplier	float	4.0	0–20	Impact foam.
SplashFoamDecayRate	float	1.2	0.1–5	Foam fade rate for splash patches.
ImpactSplashDuration	float	3.0	0.5–10	Total active duration of an impact splash (seconds).
Decay
DecayRate	float	0.2	0.01–5	Effect fade rate.
AdvectionStrength	float	0.5	0–1	Outward propagation.
DiffusionStrength	float	0.5	0–1	Spread / dispersion.
WaveEquationSpeed	float	0.4	0.01–2	Ripple propagation speed (c²).
WaveEquationDamping	float	0.02	0.001–0.5	Viscous damping.
Thresholds
MinSpeedForRipple	float	15.0	1–100	Min speed for ripples (cm/s).
MinSpeedForWake	float	200.0	50–500	Min speed for wakes (cm/s).
MinRadiusForWake	float	100.0	10–500	Min radius for wakes (cm).
MinVerticalSpeedForSplash	float	30.0	10–200	Min vertical speed (cm/s) to trigger an impact splash.
Output
MaxDisplacementHeight	float	2.0	0.5–10	Max height clamp.
MaxFlowStrength	float	2.0	0.5–10	Max flow clamp.
MaxFoam	float	1.0	0.1–5	Max foam clamp.
Wake extras
WakeIntensityMultiplier	float	1.0	0–5	Extra master multiplier on wake outputs.

VesselDataAsset

UDRW_VesselDataAsset

Purpose: Master vessel configuration that aggregates all sub-assets for a complete vessel definition.

Used by: Vessel, VesselPawn (VesselData property).

Properties

Property	Type	Description
Identity
DisplayName	FText	Human-readable name.
Description	FText	Description text.
Icon	Texture2D (soft)	Optional thumbnail.
Tags	Array<FName>	Free-form tags for categorisation.
Configuration
Hull	HullDataAsset	Hull configuration. Required for `IsValid()` to return true.
Hydrodynamics	HydrodynamicsDataAsset	Resistance profile (optional: sensible defaults when null).
Stability	StabilityDataAsset	Stability profile (optional: sensible defaults when null).
PropulsionSources	Array<PropulsionDataAsset>	Engines, sails, jets, etc. Empty array is valid but the vessel won’t move.
ControlSurfaces	Array<ControlSurfaceDataAsset>	Rudders, trim tabs, foils, etc. Empty array is valid but the vessel won’t steer.

Blueprint API

Function	Returns	Description
IsValid()	bool	True when at least the Hull is assigned.
HasEngine()	bool	True if any propulsion source has Type=Engine.
HasSail()	bool	True if any propulsion source has Type=Sail.
GetTotalPowerKW()	float	Sum of `MaxPowerKW` across all engine propulsion sources.
GetTotalSailArea()	float	Sum of `SailArea` across all sail propulsion sources (m²).

HullDataAsset

UDRW_HullDataAsset

Purpose: Hull geometry and hydrodynamic form coefficients.

Used by: VesselDataAsset (Hull property).

Properties

Property	Type	Default	Range	Description
HullType	enum	Displacement	:	Displacement, SemiDisplacement, Planing, Hydrofoil, Multihull.
WaterlineLength	float	500.0	10+	Length at waterline (cm).
WaterlineBeam	float	150.0	10+	Beam at waterline (cm).
Draft	float	50.0	1+	Hull draft (cm).
Freeboard	float	100.0	1+	Height above waterline (cm).
BlockCoefficient	float	0.5	0.2–0.95	Volume ratio (Cb).
MidshipCoefficient	float	0.85	0.6–1.0	Midship fullness (Cm).
PrismaticCoefficient	float	0.65	0.5–1.0	Volume distribution (Cp).
WaterplaneCoefficient	float	0.75	0.5–1.0	Waterplane area (Cwp).
DeadriseAngle	float	15.0	0–30	Transom deadrise (degrees).

Blueprint API (pure)

These derive useful values from the hull’s geometry: handy for HUD speedometers, debug overlays, AI decisions.

Function	Returns	Description
GetDisplacementVolume()	float	Approximate underwater volume from form coefficients (m³).
GetWettedSurfaceArea()	float	Approximate wetted surface area (m²).
GetHullSpeed()	float	Theoretical “hull speed”: the displacement-mode efficiency limit (cm/s).
GetFroudeNumber(SpeedCmS)	float	Froude number for a given speed (dimensionless).

HydrodynamicsDataAsset

UDRW_HydrodynamicsDataAsset

Purpose: Resistance model, added mass coefficients, and planing parameters.

Used by: VesselDataAsset (Hydrodynamics property).

Properties

Property	Type	Default	Range	Description
Resistance
FrictionalMultiplier	float	1.0	0.1–3	Viscous resistance. 1.0 = clean hull.
WaveMakingMultiplier	float	1.0	0.1–3	Wave-making resistance.
AppendageFactor	float	1.1	1–1.5	Appendage drag (rudders, shafts).
FormFactor	float	1.15	1–2	3D flow effects (1+k).
LateralDragCoefficient	float	1.5	0.5–5	Sideways resistance.
Added mass
AddedMassLongitudinal	float	0.05	0–0.5	Surge (fore / aft).
AddedMassLateral	float	0.8	0–1.5	Sway (sideways).
AddedMassVertical	float	0.3	0–1	Heave (vertical).
AddedInertiaRoll	float	0.25	0–1	Roll added inertia.
AddedInertiaPitch	float	0.3	0–1	Pitch added inertia.
AddedInertiaYaw	float	1.0	0–2	Yaw added inertia.
Planing
bEnablePlaning	bool	false	:	Enable planing physics.
PlaningThresholdSpeed	float	500.0	100+	Planing onset speed (cm/s).
PlaningLiftCoefficient	float	0.3	0–1	Dynamic lift when planing.
PlaningWettedAreaRatio	float	0.4	0.2–1	Wetted area ratio vs at rest.
DragCurve	CurveFloat (soft)	:	:	Custom drag: Froude → multiplier.

PropulsionDataAsset

UDRW_PropulsionDataAsset

Purpose: Configures a single propulsion source: engine, sail, paddle, oar, or jet.

Used by: VesselDataAsset (PropulsionSources array).

Properties (Engine)

Property	Type	Default	Range	Description
Type	enum	Engine	:	Engine, Sail, Paddle, Oar, Jet.
LocalPosition	FVector	(-200, 0, -30)	:	Mount position (cm).
bCanSteer	bool	false	:	Steerable (outboard, sterndrive).
MaxSteeringAngle	float	30.0	0–90	Max steering angle (degrees).
MaxPowerKW	float	150.0	1+	Max power (kW = HP × 0.7457).
MaxRPM	float	6000.0	100+	Max RPM.
IdleRPM	float	800.0	100+	Idle RPM.
ThrottleResponse	float	2.0	0.1–10	Throttle response rate.
bCanReverse	bool	true	:	Reverse capability.
ReverseEfficiency	float	0.6	0.3–1	Reverse thrust ratio.
PropDiameter	float	40.0	10+	Propeller diameter (cm).
PropPitch	float	50.0	10+	Propeller pitch (cm/rev).
PropEfficiency	float	0.55	0.3–0.8	Propeller efficiency (η).

Properties (Sail)

Property	Type	Default	Description
SailType	enum	Bermuda	Bermuda, Gaff, Junk, Spinnaker, Headsail.
SailRole	enum	Main	Main, Jib, or Spinnaker. Determines which input action drives this sail. A “main + jib” rig needs one PropulsionDataAsset per role.
SailArea	float	30.0	Sail area (m²).
MastHeight	float	12.0	Centre of effort height above the deck (m).
SailLiftCurve	CurveFloat (soft)	:	Optional: lift coefficient vs apparent-wind angle. Sensible default applied if unset.
SailDragCurve	CurveFloat (soft)	:	Optional: drag coefficient vs apparent-wind angle.

Properties (Paddle / Oar)

Property	Type	Default	Description
MaxHumanPower	float	150.0	Sustainable power output of a human paddler (W). Range: 50–500.
BladeArea	float	800.0	Paddle / oar blade area (cm²).
BladeEfficiency	float	0.65	Fraction of stroke energy converted to thrust. Range: 0.3–0.9.

Use one PropulsionDataAsset per oar / paddle. The driving input action is determined automatically by the propulsion Type.

Properties (Jet)

Property	Type	Default	Description
JetMaxThrust	float	5000.0	Max thrust (Newtons).
JetNozzleDiameter	float	15.0	Nozzle diameter (cm). Range: 5–50.
JetReverseBucketEfficiency	float	0.65	Reverse deflection efficiency. Range: 0.3–0.9.
JetEfficiencyCurve	CurveFloat (soft)	:	Optional: efficiency vs intake speed.

Engine curves

Engines support optional curves on the same data asset that override the default torque / thrust models:

Property	Description
TorqueCurve	Engine output torque vs RPM.
ThrustCurve	Propeller thrust vs vessel speed.
TorqueCurveProp	Propeller load curve vs RPM.

ControlSurfaceDataAsset

UDRW_ControlSurfaceDataAsset

Purpose: Configures a single control surface: rudder, trim tab, hydrofoil, centerboard, keel, or thruster.

Used by: VesselDataAsset (ControlSurfaces array).

Properties (Rudder)

Property	Type	Default	Range	Description
Type	enum	Rudder	:	Rudder, TrimTab, Hydrofoil, Centerboard, Keel, BowThruster, SternThruster.
LocalPosition	FVector	(-250, 0, -40)	:	Mount position (cm).
RudderArea	float	2000.0	100+	Blade area (cm²).
MaxDeflection	float	35.0	5–45	Max angle (degrees).
AspectRatio	float	2.0	0.5–5	Height / chord ratio.
DeflectionRate	float	45.0	5+	Turn rate (deg/s).
MinEffectiveSpeed	float	50.0	:	Min speed for effectiveness (cm/s).
StallAngle	float	18.0	10–25	Stall angle (degrees).

Properties (TrimTab)

Property	Type	Default	Description
TrimTabArea	float	500.0	Tab planform area (cm²).
TrimMaxDeflection	float	20.0	Max deflection angle (degrees).
TrimActivationSpeed	float	300.0	Speed at which trim tabs become effective (cm/s).

Properties (Hydrofoil)

Property	Type	Default	Description
FoilArea	float	3000.0	Foil planform area (cm²).
FoilSpan	float	150.0	Foil span (cm).
FoilTakeoffSpeed	float	800.0	Speed at which the foil generates enough lift to fly (cm/s).
TargetFlyingHeight	float	50.0	Target hull-above-water height when fully foiling (cm).
FoilLiftCurve	CurveFloat (soft)	:	Optional lift coefficient vs angle of attack.

Properties (Centerboard / Keel)

Centerboards and keels share the same lateral-fin model: different Type values, same fields.

Property	Type	Default	Description
LateralArea	float	8000.0	Lateral plan area (cm²): controls anti-leeway resistance. Min 1000.
MaxDepth	float	120.0	(Centerboard only) Max retract depth below the hull (cm).
BallastWeight	float	500.0	(Keel only) Ballast mass (kg). Lowers the centre of gravity, raising stability.

Centerboards are driven by the Centerboard input action: 0 retracted, 1 extended. Keels are static: they contribute lateral resistance and ballast continuously.

Properties (Thruster: bow / stern)

Property	Type	Default	Description
ThrusterForce	float	2000.0	Max lateral thrust (Newtons).
ThrusterMaxSpeed	float	200.0	Speed above which the thruster loses authority (cm/s).

Bow and stern thrusters are driven by their respective input actions.

StabilityDataAsset

UDRW_StabilityDataAsset

Purpose: Hull stability, roll damping, and auto-leveling.

Used by: VesselDataAsset (Stability property).

Properties

Property	Type	Default	Range	Description
MetacentricHeight	float	100.0	1+	GM in cm. Higher = stiffer.
VerticalCenterOfGravity	float	0.0	-500 to 500	VCG relative to waterline (cm).
MaxRightingAngle	float	60.0	30–180	Angle of vanishing stability (degrees).
RightingArmCurve	CurveFloat	:	:	GZ curve: heel → righting arm.
NaturalRollPeriod	float	4.0	1–20	Natural roll period (seconds).
RollDamping	float	0.5	0–5	Roll damping coefficient.
PitchDamping	float	0.3	0–5	Pitch damping coefficient.
YawDamping	float	0.2	0–5	Yaw damping coefficient.
BilgeKeelFactor	float	0.0	0–2	Bilge keel effectiveness.
bEnableAutoLevel	bool	false	:	Auto-leveling assist.
AutoLevelStrength	float	0.1	0–1	Auto-level correction strength.
AutoLevelMaxAngle	float	15.0	1–45	Engage angle (degrees).

VesselInputConfig

UDRW_VesselInputConfig

Purpose: Pre-configured input action bindings for vessels.

Used by: VesselInputComponent (when InputSource = CustomConfig).

Properties

Property	Type	Description
MappingContext	InputMappingContext	UE Enhanced Input mapping context.
MappingPriority	int32	Context priority (default: 0).
Primary actions
Throttle	InputAction	-1 (reverse) to 1 (forward).
Steering	InputAction	-1 (port) to 1 (starboard).
Camera actions
CameraLook	InputAction	2D axis (yaw, pitch).
CameraZoom	InputAction	1D axis.
CameraCycleMode	InputAction	Bool.
CameraFirstPerson	InputAction	Bool.
CameraReset	InputAction	Bool.
Trim actions
TrimLeft / TrimRight	InputAction	0 to 1 each.
Sailing actions
MainSheet / JibSheet / Spinnaker	InputAction	0 (eased) to 1 (tight).
Centerboard	InputAction	0 (up) to 1 (down).
Thruster actions
BowThruster / SternThruster	InputAction	-1 (port) to 1 (starboard).
Paddle / oar actions
LeftPaddle / RightPaddle	InputAction	0 to 1.
RowingPower	InputAction	0 to 1 (paired oars).
Foil action
FoilAngle	InputAction	-1 to 1.