So in the MoveForward case pictured above, if you have only W held down the Axis’ value is 1, but if you had both W and S held down then the Axis’ value would be 0. In both C++ and Blueprints, Axis events will fire every frame passing the current value of the Axis while Action events will have the Pressed and Released outputs fire as the key(s) are pressed.Īn Axis’ value is the sum of the values of each key’s state in that frame. In Blueprints you can place an Axis or Action Event node from the Input section of the context menu or palette of any Actor blueprint. InputComponent->BindAction('Fire', IE_Released, this, &ASampleCharacter::OnEndFire) InputComponent->BindAction('Fire', IE_Pressed, this, &ASampleCharacter::OnBeginFire) InputComponent->BindAxis('MoveForward', this, &ASampleCharacter::MoveForward) The bindings are formed by calling BindAction/Axis on the InputComponent. In C++ you will most typically set up your bindings in the Pawn/Character::SetupPlayerInputComponent or PlayerCharacter::SetupInputComponent functions however, anywhere you have an InputComponent is valid. Mappings can be bound to behaviors from both Blueprints and C++. Now that I’ve defined some mappings, how do I use these things? This is particularly useful for creating an axis out of keyboard keys (for example, W can represent pressing up on the gamepad stick while S represents pressing down).

The Scale is a multiplier on the value of the key when summing up the Axis’ value. Instead of specifying any modifier keys, however, you specify a Scale. Axis mappings are also reasonably straightforward. In the Input section of Engine Project Settings you can see the list of existing mappings and create new ones.Īctions are pretty straightforward: give the action a name, add the keys you want mapped to the action, and specify which modifier keys need to be held when the key is pressed. W/S for forward and back in typical FPS controls). gamepad thumbstick axes which have a range of ) as components of an axis (e.g. Finally, using input mappings allows you to interpret input keys that aren’t an axis input (e.g. It also makes remapping which keys are mapped to the behavior easy, both at a project level if you change your mind about default settings, and for a user in a key binding UI. Using input mappings gives you the ability to map multiple keys to the same behavior with a single binding.

Why would I want to use a mapping instead of binding directly to the key? Action Mappings are for key presses and releases, while Axis Mappings allow for inputs that have a continuous range. So what are Action and Axis Mappings?Īction and Axis Mappings provide a mechanism to conveniently map keys and axes to input behaviors by inserting a layer of indirection between the input behavior and the keys that invoke it. While it is certainly valid to bind keys directly to events, I hope I can convince you that using mappings will be the most flexible and convenient way to set up your input. To that end, we created Input Action and Axis Mappings.

In Unreal Engine 4 we wanted to make binding input events as easy as possible.

Unity 5 palette swap single object