mixed-reality

All platforms

The same action and axis mappings in the game’s input project settings can be used from C++.

Create a new C++ Class with File/New C++ Class…

Creating a new C++ class

Create a pawn

Creating a pawn

In the project’s Visual Studio solution, find the new Pawn class and configure it for input.
- First, in the constructor, set AutoPossessPlayer to the first player to route input to the pawn.

AMyPawn::AMyPawn()
{
    PrimaryActorTick.bCanEverTick = true;

    AutoPossessPlayer = EAutoReceiveInput::Player0;
}

Then in SetupPlayerInputComponent, bind actions and axis events to the action names from the project’s input settings.

void AMyPawn::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    Super::SetupPlayerInputComponent(PlayerInputComponent);

    PlayerInputComponent->BindAction("X_Button", IE_Pressed, this, &AMyPawn::XPressed);
    PlayerInputComponent->BindAction("L_GripAxis", this, &AMyPawn::LeftGripAxis);
}

Add the callback functions to the class:

void AMyPawn::XPressed()
{
    UE_LOG(LogTemp, Log, TEXT("X Pressed"));
}

void AMyPawn::LeftGripAxis(float AxisValue)
{
    if(AxisValue != 0.0f) 
    {
        UE_LOG(LogTemp, Log, TEXT("Left Grip Axis Valule: %f"), AxisValue);
    }
}

Update the Pawn’s header with the callback function definitions:

private:
    void XPressed();
    void LeftGripAxis(float AxisValue);

Compile from Visual Studio to launch the editor with the new pawn. Drag and drop the pawn from the content browser into the game and the pawn will now execute the callbacks when input is pressed.

SteamVR

When using thumbstick axis events, the name of the axis event must end in “_X” or “_Y” corresponding to the key used.

Using thumbstick events

Finally, register the actions in the game with SteamVR by using the Regenerate Action Manifest and Regenerate Controller Bindings buttons in Project Settings > Steam VR Input.

Registering actions in project settings

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