Hi!
I’m trying to figure out how to work with mouse wheel. I have defined this in the project settings:
And this is the code:
The function InputAxis ZoomOut is always triggering with AxisValue = 0.0, and the Mouse Wheel Up triggers only when I move up the wheel.
I’ve done this project to test it before move everything to C++, and I don’t know if there is a function Mouse Wheel Up in C++.
How can I use the mouse wheel up and down?
It makes sense that the axis value is 0 because the scroll wheel acts more like a button (a single movement up or down) after which it rests and does nothing. Unlike a joystick, you can’t “hold” a mousewheel into a direction.
You should add the ZoomIn and ZoomOut as ActionMappings. Every time one of these events executes, you should call DoZoom() with a constant up or down float value, which adds or subtracts from a stored target value you want to zoom towards.
Seda is correct, mouse wheel input is digital, it is treated as a button.
Thanks for your answer.
How can I add a constant value (node) to the blueprint graph? For example, the value 1.0 or -1.0.
I’ve been searching about how to do it but I can’t find anything.
Thanks.
This can be boiled down to a single event, no additional Gates or Tick needed:
How can I a constant value to the blueprint graph? For example, the value 1.0 or -1.0.
Not sure why you’d need this but, to answer literally, you could:
Or:
Or:
But that’d be quite awkward to use unless you’re after some specific behaviour, of course. Who knows.
Thanks, I wrote this part early on the start of my UE journey 
Compare Float node feels promising, will rewrite this piece
