Hi there, that is fairly simple.
You can start with getting the mouse position in the world with deproject.
LetsSayThis MouseDeprojectLoc
In you character / component / camera where ever you are writing logic;
MousePos = LineTraceSingle ( MouseDeprojectLoc, MouseDeprojectLoc + MouseDeprojectDir * 10000) ->Hit() -> HitLocation Example Tutorial
This is basically true world location under your mouse.
TargetCameraLoc = MousePos
CurrentCameraLoc = SpringArm->WorldLocation;
You can use this to OnMouseWheel-> Set (ZoomFractionLocation)
ZoomFractionLocation = Lerp (CurrentCameraLoc ,TargetCameraLoc , FractionOfZoom)
FractionOfZoom is something like 0.2 since you don’t want to go full zoom on one click or one wheel step. Simply by this you setting a location between your current camera and the mouse world since we want a gradual zoom.
Then you can simply zoom in
OnTick -> SetSpringArmLocation(VInterpTo (CurrentCameraLoc , ZoomFractionLocation, DeltaTime, Speed(5) ))
Recap:
OnMousewheel - > Set (ZoomFractionLocation )
OnTick → MovesCamera with Vinterp over time to ZoomFractionLocation