Camera Controls

I came across some simple camera control code on Unity Answers and wanted to have a go and expand upon it.

To begin with, i wanted to rotate the camera around a point and be able to zoom in and out.

The easiest way that i have figured out to rotate an object around a point, is to have the object you want to rotate inside another gameobject and rotate that gameobject.

To start with:

private var to : Quaternion;

private var ToX:float;
private var ToY:float;

public var TheCamera:GameObject;

function Start ()
{
  to = Quaternion.Euler(0,0,0);
  ToX = 0;
  ToY = 0;
}

function Update ()
{
  //this turns a vector3 into a Quaternion.
  to = Quaternion.Euler(ToY,ToX,0);
  //this uses the Quaternion and lerps its current position to it.
  transform.rotation = Quaternion.Lerp(transform.rotation, to, Time.time * 0.05);
}
 
From Unity Answers, i found out how to trace if the mouse had moved. But only when the left mouse button was pressed.

if(Input.GetAxis("Mouse X")<-0)
{
  ToX -= 2;
}

if(Input.GetAxis("Mouse X")>0)
{
  ToX += 2;
}

if(Input.GetAxis("Mouse Y")<-0)
{
  ToY += 1;
}
if(Input.GetAxis("Mouse Y")>0)
{
  ToY -= 1;
}

This changes what rotation X and rotation Y the camera needs to lerp to.

Tracing the mouse wheel is the same as tracing X and Y movement, but i wanted to limit how far the camera could zoom in and out.

if(Input.GetAxis("Mouse ScrollWheel")<0)
{
  if(TheCamera.camera.fieldOfView < 100)
  {
   TheCamera.camera.fieldOfView += 4;
  }
}

if(Input.GetAxis("Mouse ScrollWheel")>0)
{
  if(TheCamera.camera.fieldOfView > 10)
  {
  TheCamera.camera.fieldOfView -= 4;
  }
}

I then placed this all inside a if(Input.GetMouseButton(1)) so it was only being traced when the left button was being pressed.

Lastly i looked up a way of locking the cursor to the screen and hiding it. This stops you from accidentally clicking outside of the screen. It is as simple as:
Screen.showCursor = true/false;
Screen.lockCursor = true/false;

Next i placed one of my models in the center to test the code out. Initially i used a lerp to animate the ship hovering, but it was too sharp on the start points. So i wrote a little code that works like a pendulum:

private var MoveUp : float = 0.001;

function Update ()
{
  transform.position += Vector3(0,MoveUp,0);

  if(transform.position.y < -0.002)
  {
   if(MoveUp < 0.001)
   {
   MoveUp += 0.000005;
   }
  }else if(transform.position.y > 0.002){
   if(MoveUp > -0.001)
   {
    MoveUp -= 0.000005;
   }
  }
}

End Result:
Camera Test