Get Mouse Acceleration, works only when i press a mouse button

Development Programming & Scripting C++
1

Hi all,

this may be some real simple thing, i just could not find out why it is happening.

I did some AxisInput for MouseX and MouseY. I bound that in my PlayerController using BindAxis. Now, i only get the according input when i press and hold a mouse button, otherwise the input is zero.
I also already tried fiddling around with IgnoreLookInput, but this was not really helping.

Any Ideas on that?

Thanks

2

Is your goal to get the change in mouse movement in x and y axis?

You can obtain that (without any mouse buttons having been pressed) this way:


//Player Controller Function
//Mouse Dx/dy
FVector2D MouseDelta;
GetInputMouseDelta(MouseDelta.X, MouseDelta.Y);
3

Hi ,

thanks for that function, thats a bit simpler than needing to have inputbindings and stuff around it for that.

Though no matter if i do it with InputBindings or GetInputMouseDelta, i only get values other than zero when i press a mouse button for some reason.

To clarify, this is my (reduced) PlayerController:

.h:



#pragma once

#include "GameFramework/Actor.h"
#include "PlayGroundPlayerController.generated.h"

UCLASS()
class APlayGroundPlayerController : public APlayerController {
        GENERATED_UCLASS_BODY()

protected:
        // Begin PlayerController interface
        virtual void PlayerTick(float DeltaTime) OVERRIDE;
        virtual void SetupInputComponent() OVERRIDE;
        // End PlayerController interface

}

.cpp (here only the Tick-Function since this already troubles me):



void APlayGroundPlayerController::PlayerTick(float DeltaTime) {
	Super::PlayerTick(DeltaTime);

	FVector2D MouseDelta;
	GetInputMouseDelta(MouseDelta.X, MouseDelta.Y);
	if (MouseDelta.X != 0 || MouseDelta.Y != 0) {
		aMouseX = MouseDelta.X;
	}

}

When i put a Breakpoint on the line aMouseX = MouseDelta.X; then i only get there when i move the Mouse AND press any button.

Any ideas?

Thanks for your help!

Cheers,

4

I’m gonna look into this in a bit, but in the meantime,

another way to get constant feedback to yourself could be this, onscreen, constantly showing you want is happening, realtime :slight_smile:



FVector2D MouseDelta;
GetInputMouseDelta(MouseDelta.X, MouseDelta.Y);
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("Mouse Input Delta: %s"), *MouseDelta.ToString()));
//
//

That should make things even more obvious :slight_smile:

If you try this, I anticipate it will read all 0s even if you move mouse, until you hold down a button as well?

Can you verify the onscreen version?

Also, not using any conditional statements?

5

Hi ,

thanks for taking the time.

There are no additional conditionals in any way, i already reduced the PlayerTick to what i wrote one post earlier. Of course i already tried logging Debug - Messages, with the same result.

When i got some time again i will try creating a new empty project which just has the logging of the mouse-accel implemented, just to know if its some setting i did (Though i already checked everything, but you can never be really sure :wink: ).

Since it should work for other devs (or otherwise we would have more threads with this topic here), it must be some setting or override anywhere.

Cheers,

6

Well it certainly works for me!

I use Mouse Delta all the time in my game, without any mouse buttons pressed

I think I’ve heard of this issue before though, but I dont know the solution

will poke around and see if I find anything

7

Are you setting bShowMouseCursor to true by any chance? If so, maybe its a mouse capture issue?

8

Hi,

yeah, i almost forgot about that, since this is in my Character - BaseClass :slight_smile:

So i guess this is the HardwareCursor then, and it doesnt forward the acceleration to the engine itself while not clicking?

I guess this is the perfect opportunity to finally start implementing my Game-UI with a custom mouse-cursor; For now i was pushing it back the whole time :wink:

Thanks!

Cheers,