Relative camera movement at fixed height

Questions & Answers
1

I’m trying to script a player-controlled free-moving camera of the sort used in modern RTS games, where the camera is rotatable around the X and Y axis while the middle mouse button is held down, translatable along the X and Z axis while the right mouse button is held down, and translatable along the Y axis using the scroll wheel.

I have managed to get the rotation and Y axis translation working, but I don’t know how to get the right mouse button click and drag effect to work. I’d like the camera to move laterally relative to the direction it is currently facing at a fixed height. Presently, it moves along the X axis in exactly the way that I would like due to Z rotation being fixed at 0, but gets closer or further from the ground along the Z axis, depending on the amount of X rotation.

Is there a simple way to make the camera move forward in the direction it is facing without affecting its global Y height?

Here’s what isn’t working for me:

//Adds Mouse X amount of relative force to X and Mouse Y amount of relative force to Z while the right button is held down	
rightButton = Input.GetMouseButton(1);

if(rightButton == true){
	xAmount = Input.GetAxis("Mouse X")*lateralSpeed;
	zAmount = Input.GetAxis("Mouse Y")*lateralSpeed;
	rigidbody.AddRelativeForce(-xAmount,0,-zAmount);
	}

Would love to know where to go from here!

2

Hi, this is what I managed to figure out for a fixed Y value:

void Update ()
{
    SetFixedY(5.0f);
}

void SetFixedY (float n)
{
    transform.position = new Vector3(transform.position.x, n, transform.position.z);
}