AMjImpulseLauncher¶

Applies a one-shot MuJoCo force impulse to a target MjBody.

Place in level, set TargetBody reference and ImpulseStrength. Fire via Blueprint (FireImpulse), input action, or auto-fire on BeginPlay. The impulse direction is taken from the actor's forward vector, so aim the actor at the target. For the teaser video perturbation shot: attach a static mesh (crate) as a Quick Convert body, then use this actor to launch it at the robot.

Attribute	Value
Kind	`Class`
UE Macro	`UCLASS`
Inherits	`AActor`

Properties Functions

Properties¶

Public Properties¶

Property	Type	Description
`TargetActor`	`AActor*`	The target actor to apply the impulse to. Must be an MjArticulation or have an MjQuickConvertComponent.
`TargetBodyName`	`FName`	Optional: name of a specific MjBody component on the target actor. If empty, uses the first MjBody found.
`LaunchSpeed`	`float`	Launch speed in m/s. Sets the body's velocity directly (like throwing it).
`DirectionOverride`	`FVector`	Direction override. If zero, uses the actor's forward vector. In Unreal world space.
`LaunchTarget`	`AActor*`	Optional: an actor to launch AT. Overrides direction — computes a ballistic arc toward this target.
`ArcHeight`	`float`	Arc height as a fraction of the distance to target. 0 = flat, 0.5 = high lob. Only used with LaunchTarget.
`bAutoFire`	`bool`	If true, fires automatically on BeginPlay after the delay.
`AutoFireDelay`	`float`	Delay in seconds before auto-fire (only used if bAutoFire is true).
`bResetAndFire`	`bool`	Tick this in the editor Details panel during PIE to reset + fire. Auto-clears.

TargetActor¶

The target actor to apply the impulse to. Must be an MjArticulation or have an MjQuickConvertComponent.

Type: AActor*
Editor: ✏️ EditAnywhere
Blueprint: 🔵 ReadWrite
Category: MuJoCo|Impulse

TargetBodyName¶

Optional: name of a specific MjBody component on the target actor. If empty, uses the first MjBody found.

Type: FName
Editor: ✏️ EditAnywhere
Blueprint: 🔵 ReadWrite
Category: MuJoCo|Impulse

LaunchSpeed¶

Launch speed in m/s. Sets the body's velocity directly (like throwing it).

Type: float
Editor: ✏️ EditAnywhere
Blueprint: 🔵 ReadWrite
Category: MuJoCo|Impulse

DirectionOverride¶

Direction override. If zero, uses the actor's forward vector. In Unreal world space.

Type: FVector
Editor: ✏️ EditAnywhere
Blueprint: 🔵 ReadWrite
Category: MuJoCo|Impulse

LaunchTarget¶

Optional: an actor to launch AT. Overrides direction — computes a ballistic arc toward this target.

Type: AActor*
Editor: ✏️ EditAnywhere
Blueprint: 🔵 ReadWrite
Category: MuJoCo|Impulse

ArcHeight¶

Arc height as a fraction of the distance to target. 0 = flat, 0.5 = high lob. Only used with LaunchTarget.

Type: float
Editor: ✏️ EditAnywhere
Blueprint: 🔵 ReadWrite
Category: MuJoCo|Impulse
Notes: Override-enabled (LaunchTarget)

bAutoFire¶

If true, fires automatically on BeginPlay after the delay.

Type: bool
Editor: ✏️ EditAnywhere
Blueprint: 🔵 ReadWrite
Category: MuJoCo|Impulse

AutoFireDelay¶

Delay in seconds before auto-fire (only used if bAutoFire is true).

Type: float
Editor: ✏️ EditAnywhere
Blueprint: 🔵 ReadWrite
Category: MuJoCo|Impulse
Notes: Override-enabled (bAutoFire)

bResetAndFire¶

Tick this in the editor Details panel during PIE to reset + fire. Auto-clears.

Type: bool
Editor: ✏️ EditAnywhere
Blueprint: 🔵 ReadWrite
Category: MuJoCo|Impulse

Protected Properties¶

Property	Type	Description
`DirectionArrow`	`UArrowComponent*`

DirectionArrow¶

Type: UArrowComponent*
Editor: 👁 VisibleAnywhere
Blueprint: 🟢 ReadOnly
Category: MuJoCo|Impulse

Functions¶

Public Functions¶

MuJoCo|Impulse¶

Function	Returns	Description
`FireImpulse()`	void	Fire the impulse. Can be called from Blueprint, input binding, or Sequencer event track.
`ResetAndFire()`	void	Teleport the projectile back to the launcher's position and fire.

FireImpulse¶

Fire the impulse. Can be called from Blueprint, input binding, or Sequencer event track.

Signature: FireImpulse()
Blueprint: 🔵 Callable

ResetAndFire¶

Teleport the projectile back to the launcher's position and fire.

Signature: ResetAndFire()
Blueprint: 🔵 Callable

Private Functions¶

General¶

Function	Returns	Description
`ResolveTargetBody()`	UMjBody*	Resolve TargetActor into an MjBody pointer. Called once on first fire.

ResolveTargetBody¶

Resolve TargetActor into an MjBody pointer. Called once on first fire.

Signature: ResolveTargetBody()
Returns: UMjBody*