Question If I wanted all my calculations to be done in ScreenSpace instead of WorldSpace....

How would I do that?

Example. I want to move a 2d Square but not using the world coords. How could this be done with the result being converted to WorldSpace anyway where movement code will not be?

 

As far as I know there is no way to override all physics or movement code in Unity, but you could use a base class which all of your objects are deriving from. And then instead of setting the position or anything like that directly, you instead call a method that does the conversion automatically from the object.

Code (CSharp):

1.  
2. public abstract class ScreenObject : Monobehaviour
3. {  
4.       public void SetPosition(Vector3 screenPos)
5.       {
6.             Vector3 worldCalculations = Camera.main.ScreenToWorldPoint(screenPos)
7.             transform.position = worldCalculations;
8.       }
9. }
10.  

And then your actual gameObject:

Code (CSharp):

1.  
2. public class Player : ScreenObject
3. {
4.       void Update()
5.       {
6.             Vector3 screenCalculations;
7.  
8.             //Do screen calculations
9.  
10.             SetPosition(screenCalculations)
11.       }
12. }
13.