AMjReplayManager

Attribute	Value
Kind	Class
UE Macro	UCLASS
Inherits	AActor

Properties Functions

Properties

Public Properties

Property	Type	Description
MaxRecordDuration	float	Maximum duration of recording in seconds.
bIsRecording	bool
bIsReplaying	bool
bAutoRecord	bool	If true, starts recording automatically on BeginPlay.
PlaybackTime	float	Current playback time (0 to Duration). Updated on physics thread, read on game thread.
bInterpolateFrames	bool	Enable linear interpolation between replay frames for smoother playback.
ActiveSessionName	FString
ArticulationBindings	TArray<FReplayArticulationBinding>	Per-articulation replay bindings.

MaxRecordDuration

Maximum duration of recording in seconds.

• Type: float
• Editor: ✏️ EditAnywhere
• Blueprint: 🔵 ReadWrite
• Category: URLab|Replay

bIsRecording

• Type: bool
• Editor: 👁 VisibleAnywhere
• Blueprint: 🟢 ReadOnly
• Category: URLab|Replay

bIsReplaying

• Type: bool
• Editor: 👁 VisibleAnywhere
• Blueprint: 🟢 ReadOnly
• Category: URLab|Replay

bAutoRecord

If true, starts recording automatically on BeginPlay.

• Type: bool
• Editor: ✏️ EditAnywhere
• Blueprint: 🔵 ReadWrite
• Category: URLab|Replay

PlaybackTime

Current playback time (0 to Duration). Updated on physics thread, read on game thread.

• Type: float
• Editor: 👁 VisibleAnywhere
• Blueprint: 🟢 ReadOnly
• Category: URLab|Replay

bInterpolateFrames

Enable linear interpolation between replay frames for smoother playback.

• Type: bool
• Editor: ✏️ EditAnywhere
• Blueprint: 🔵 ReadWrite
• Category: URLab|Replay

ActiveSessionName

• Type: FString
• Editor: 👁 VisibleAnywhere
• Blueprint: 🟢 ReadOnly
• Category: URLab|Replay

ArticulationBindings

Per-articulation replay bindings.

• Type: TArray<FReplayArticulationBinding>

Private Properties

Property	Type	Description
bFirstReplayFrame	bool	Tracks whether the current replay has emitted its first frame. Reset on StartReplay().
bFirstFrameLogged	bool	One-shot diagnostic flag: logs the first OnPostStep frame after
LastReplayLogTime	double	Throttles periodic replay logging to once per second.

bFirstReplayFrame

Tracks whether the current replay has emitted its first frame. Reset on StartReplay().

• Type: bool

bFirstFrameLogged

One-shot diagnostic flag: logs the first OnPostStep frame after

• Type: bool

LastReplayLogTime

Throttles periodic replay logging to once per second.

• Type: double

Functions

Public Functions

General

Function	Returns	Description
RebuildArticulationBindings()	void	Matches scene articulations against the active session.
GetLiveFrameCount()	int32	Number of frames captured in the live recording buffer.
GetLiveSimDurationS()	double	Wall-clock-aligned sim duration of the live recording in

RebuildArticulationBindings

Matches scene articulations against the active session.

• Signature: RebuildArticulationBindings()

GetLiveFrameCount

Number of frames captured in the live recording buffer.

• Signature: GetLiveFrameCount()
• Returns: int32

GetLiveSimDurationS

Wall-clock-aligned sim duration of the live recording in

• Signature: GetLiveSimDurationS()
• Returns: double

URLab|Replay

Function	Returns	Description
LoadFromCSV()	bool	Load joint trajectory from a CSV file. Header row must contain joint names matching MuJoCo model.
BrowseAndLoadCSV()	bool	Opens a file dialog to browse for a CSV file, then loads it.

LoadFromCSV

Load joint trajectory from a CSV file. Header row must contain joint names matching MuJoCo model.

• Signature: LoadFromCSV(FString FilePath, float Timestep)
• Blueprint: 🔵 Callable 🔧 CallInEditor
• Returns: bool

BrowseAndLoadCSV

Opens a file dialog to browse for a CSV file, then loads it.

• Signature: BrowseAndLoadCSV(float Timestep)
• Blueprint: 🔵 Callable 🔧 CallInEditor
• Returns: bool