Why does Input.GetAxis("Mouse X/Y") result in inverted movement?

Questions & Answers
1

I’ve written a script that gets the X and Y movement from the mouse and translates that into rotation in the x & y axis.

if (isMouseLookMode == true)
{
     mouseMovement.x = mouseLookSensitivity * Input.GetAxis ("Mouse X");
     mouseMovement.y = -mouseLookSensitivity * Input.GetAxis ("Mouse Y");
     transform.Rotate (mouseMovement.y, mouseMovement.x, 0);
}

However, I had to swap the x with the y values, and make the y value negative to achieve the same mouse rotation as in Unity (ie. holding down right mouse button rotates the viewport).

Why is this the case?

2

Because that’s what you’d expect…? Moving the mouse right leads to a clockwise rotation about the y-axis, moving the mouse up leads to a anti-clockwise rotation about the x-axis. I’m not sure what the problem is, but it sounds like you don’t understand the parameters to transform.Rotate: Unity - Scripting API: Transform.Rotate