# Calculating World position of screen's corners?

Discussion in 'Scripting' started by bronxbomber92, Mar 4, 2008.

1. ### bronxbomber92

Joined:
Nov 11, 2006
Posts:
888
Is this the correct way to do this?
To add some context, these positions will be used to place box collider around the screen.

Code (csharp):
1. // Screens coordinate corner location
2.     var upperLeftScreen = Vector3(0, Screen.height, ship.transform.position.y );
3.     var upperRightScreen = Vector3(Screen.width, Screen.height, ship.transform.position.y);
4.     var lowerLeftScreen = Vector3(0, 0, ship.transform.position.y);
5.     var lowerRightScreen = Vector3(Screen.width, 0, ship.transform.position.y);
6.
7.     //Corner locations in world coordinates
8.     var upperLeft = camera.ScreenToWorldPoint(upperLeftScreen);
9.     var upperRight = camera.ScreenToWorldPoint(upperRightScreen);
10.     var lowerLeft = camera.ScreenToWorldPoint(lowerLeftScreen);
11.     var lowerRight = camera.ScreenToWorldPoint(lowerRightScreen);

2. ### CoherentInk

Joined:
Jul 16, 2006
Posts:
216
Looks right to me!

3. ### bronxbomber92

Joined:
Nov 11, 2006
Posts:
888
Hmm, it doesn't work though...

Joined:
Jul 16, 2006
Posts:
216
5. ### bronxbomber92

Joined:
Nov 11, 2006
Posts:
888
Fixed it!

Here's what I did:
Code (csharp):
1. // Screens coordinate corner location
2.     var upperLeftScreen = Vector3(0, Screen.height, depth );
3.     var upperRightScreen = Vector3(Screen.width, Screen.height, depth);
4.     var lowerLeftScreen = Vector3(0, 0, depth);
5.     var lowerRightScreen = Vector3(Screen.width, 0, depth);
6.
7.     //Corner locations in world coordinates
8.     var upperLeft = camera.ScreenToWorldPoint(upperLeftScreen);
9.     var upperRight = camera.ScreenToWorldPoint(upperRightScreen);
10.     var lowerLeft = camera.ScreenToWorldPoint(lowerLeftScreen);
11.     var lowerRight = camera.ScreenToWorldPoint(lowerRightScreen);
12.     upperLeft.y = upperRight.y = lowerLeft.y = lowerRight.y = ship.transform.position.y
where
Code (csharp):
1. depth = (ship.transform.position.y-camera.transform.position.y);

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Posts:
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