Jul
26
2015

Create Orthographic Screen EdgeColliders2D

An article by mgear Comments

Small snippet for adding EdgeCollider2D along screen edges. (for orthographic camera).
Add script to empty gameobject (at position 0,0,0). *My camera was at 0,0,-10

	// perspective camera, get far clip plane edges in world space (z is set to 0)
	var bottomLeft = (Vector2)cam.ScreenToWorldPoint(new Vector3(0, 0, cam.farClipPlane));
	var topLeft = (Vector2)cam.ScreenToWorldPoint(new Vector3(0, cam.pixelHeight, cam.farClipPlane));
	var topRight = (Vector2)cam.ScreenToWorldPoint(new Vector3(cam.pixelWidth, cam.pixelHeight, cam.farClipPlane));
	var bottomRight = (Vector2)cam.ScreenToWorldPoint(new Vector3(cam.pixelWidth, 0, cam.farClipPlane));

	Debug.DrawLine(bottomLeft, topLeft, Color.red, 33);
	Debug.DrawLine(topLeft, topRight, Color.green, 33);
	Debug.DrawLine(topRight, bottomRight, Color.blue, 33);
	Debug.DrawLine(bottomRight, bottomLeft, Color.magenta, 33);

view raw

ScreenEdge.cs

hosted with ❤ by GitHub

	using UnityEngine;
	using System.Collections;

	public class ScreenEdgeCollider : MonoBehaviour
	{
	void Awake ()
	{
	AddCollider();
	}

	void AddCollider ()
	{
	if (Camera.main==null) {Debug.LogError("Camera.main not found, failed to create edge colliders"); return;}

	var cam = Camera.main;
	if (!cam.orthographic) {Debug.LogError("Camera.main is not Orthographic, failed to create edge colliders"); return;}

	var bottomLeft = (Vector2)cam.ScreenToWorldPoint(new Vector3(0, 0, cam.nearClipPlane));
	var topLeft = (Vector2)cam.ScreenToWorldPoint(new Vector3(0, cam.pixelHeight, cam.nearClipPlane));
	var topRight = (Vector2)cam.ScreenToWorldPoint(new Vector3(cam.pixelWidth, cam.pixelHeight, cam.nearClipPlane));
	var bottomRight = (Vector2)cam.ScreenToWorldPoint(new Vector3(cam.pixelWidth, 0, cam.nearClipPlane));

	// add or use existing EdgeCollider2D
	var edge = GetComponent<EdgeCollider2D>()==null?gameObject.AddComponent<EdgeCollider2D>():GetComponent<EdgeCollider2D>();

	var edgePoints = new [] {bottomLeft,topLeft,topRight,bottomRight, bottomLeft};
	edge.points = edgePoints;
	}
	}