Need Help adding camera position constraints

Questions & Answers
1

Hi, I am trying to set constraints on how far my camera can move on both the x and y axis. I am primarily a 3D content developer with very minimal coding experience. Here is what I have and it works, just need a way to constraints so the camera is bound to a certain area. THANKS!

using UnityEngine;
using System.Collections;

public class CameraDrag : MonoBehaviour {
	
	Camera cam;
	Vector3 oldPos;
	Vector3 pos;
	Vector3 deltaPos;
	
	// Use this for initialization
	void Start() {
		cam = Camera.main;
		Debug.Log("start");
	}
	
	// Update is called once per frame
	void Update() {
		if (Input.GetMouseButtonDown(2)) {
			Vector3 mousePos = Input.mousePosition;
			mousePos.z = 1;
			
			oldPos = cam.ScreenToWorldPoint(mousePos);
		}
		
		if (Input.GetMouseButton(2)) {
			Vector3 mousePos = Input.mousePosition;
			mousePos.z = 1;
			
			pos = cam.ScreenToWorldPoint(mousePos);
			
			deltaPos = new Vector3(oldPos.x - pos.x, oldPos.y - pos.y, oldPos.z - pos.z);
			cam.transform.position += deltaPos;
		}
		
		if (Input.GetMouseButtonDown(2)) {
			oldPos = pos;
		}
	}
}
2

Yo can try this:

deltaPos = new Vector3(oldPos.x - pos.x, oldPos.y - pos.y, oldPos.z - pos.z);

Vector3 newPos = cam.transform.position + deltaPos;

Vector3 newPosClamped = new Vector3(Mathf.Clamp(newPos.x, minX, maxX), Mathf.Clamp(newPos.y, minY, maxY), Mathf.Clamp(newPos.z, minZ, maxZ)); 

cam.transform.position = newPosClamped;
3

I was able to finally figure it out. Here is my completed script. Thanks so much for the help!

using UnityEngine;
using System.Collections;

public class CameraDrag : MonoBehaviour {
	
	Camera cam;
	Vector3 oldPos;
	Vector3 pos;
	Vector3 deltaPos;
	
	// Use this for initialization
	void Start() {
		cam = Camera.main;
		Debug.Log("start");
	}
	public float minX, maxX, minY, maxY, minZ, maxZ;
	// Update is called once per frame
	void Update() {
		if (Input.GetMouseButtonDown(2)) {
			Vector3 mousePos = Input.mousePosition;
			mousePos.z = 1;
			
			oldPos = cam.ScreenToWorldPoint(mousePos);
		}
		
		if (Input.GetMouseButton(2)) {
			Vector3 mousePos = Input.mousePosition;
			mousePos.z = 1;
			
			pos = cam.ScreenToWorldPoint(mousePos);
			
			deltaPos = new Vector3(oldPos.x - pos.x, oldPos.y - pos.y, oldPos.z - pos.z);
			
			Vector3 newPos = cam.transform.position + deltaPos;
			
			Vector3 newPosClamped = new Vector3(Mathf.Clamp(newPos.x, minX, maxX), Mathf.Clamp(newPos.y, minY, maxY), Mathf.Clamp(newPos.z, minZ, maxZ)); 
			
			cam.transform.position = newPosClamped;
		}
		
		if (Input.GetMouseButtonDown(2)) {
			oldPos = pos;
		}
	}
}