Lock Z Rotation

Unity Engine
1

Hello
I’ve my Main Camera and I’d like to lock its Z rotation. Here is the script:

using UnityEngine;
using System.Collections;

public class RotateCamera : MonoBehaviour 
{
	
	private float mouseX;
	private float mouseY;
	
	private float VerticalRotationMin = 0f;
	private float VerticalRotationMax = 65f;
	
	void LateUpdate () 
	{
		
		HandleMouseRotation();
		
		mouseX = Input.mousePosition.x;
		mouseY = Input.mousePosition.y;
	}
	
	public void HandleMouseRotation()
	{
		var easeFactor = 10f;
		if(Input.GetMouseButton(1))
		{
			if(Input.mousePosition.x != mouseX)
			{
				var cameraRotationY = (Input.mousePosition.x - mouseX) * easeFactor * Time.deltaTime;
				this.transform.Rotate(0, cameraRotationY, 0);
			}
			
			if(Input.mousePosition.y != mouseY)
			{	
				GameObject MainCamera = this.gameObject;
				
				var cameraRotationX = (Input.mousePosition.y - mouseY) * easeFactor * Time.deltaTime;
				var desiredRotationX = MainCamera.transform.eulerAngles.x + cameraRotationX;
				
				if(desiredRotationX >= VerticalRotationMin  desiredRotationX <= VerticalRotationMax)
					MainCamera.transform.Rotate (cameraRotationX, 0, 0);
				
			}					
		}
	}
}

I’d be thankful if someone told me how to do that. Thanks!

2

Attach a rigidibody and tick Lock Z Position

3

In pseudo-code:

void LateUpdate()
{
    float eulerZ = transform.localEulerAngles.z;
    // here is your code
    Vector3 euler = transform.localEuleraAngles.z;
    euler.z = euler.Z;
    transform.localEulerAngles = euler;
}
4

Wouldn’t it make camera feel like real body, so it’ll fall down on the ground?

5

You can disable gravity of a rigidbody :smile:

6

Damn… Yes it work’s… However i’d like my Camera to act like in picture:

800×600 17.8 KB

7

easiest way to achieve that is to steal the idea of a “camera dolly” from cinematography.

You have a “dolly” gameObject which is the parent of the camera, the camera has a relative rotation to the parent “dolly” so it’s pointing at whatever angle you like in the up/down plane. You then move and rotate the dolly in the left/right forward/backwards plane (and yes i get the x, y, z all mixed up :p).

You can probably do something with the scripting but the dolly approach is something I’ve found quite intuitive.

8

I have no idea how to do that =)

9

The trick is to reconstruct the rotation of the camera each frame instead of using the previous transform.

using UnityEngine;
using System.Collections;

public class RotateCamera : MonoBehaviour 
{
	public Vector3 center = new Vector3(0f,0f,0f);
	public float distance = 20f;
	public float rotateX = 40f;
	public float rotateY = 0f;
	public float rotateXMin = 0f;
	public float rotateXMax = 65f;
	public float easeFactor = 10.0f;
	
	private Vector3 startMousePos;
	private float startRotX;
	private float startRotY;
	private float rotateGoalX;
	private float rotateGoalY;
	private bool rotating;

	void Start ()
	{
		rotateGoalX = rotateX;
		rotateGoalY = rotateY;
		rotating = false;
	}

	void Update ()
	{
		if(Input.GetMouseButton (1)) {
			if (!rotating) {
				// Start rotating
				startMousePos = Input.mousePosition;
				startRotX = rotateX;
				startRotY = rotateY;
				rotating = true;
			}
			Vector3 delta = Input.mousePosition - startMousePos;
			rotateGoalX = Mathf.Clamp (startRotX - delta.y, rotateXMin, rotateXMax);
			rotateGoalY = startRotY + delta.x;
		}
		else
		{
			rotating = false;
		}

		float dt = Mathf.Min (Time.deltaTime * easeFactor, 1.0f);
		rotateX += (rotateGoalX - rotateX) * dt;
		rotateY += (rotateGoalY - rotateY) * dt;
	}
		
	void LateUpdate ()
	{
		// Reset transform
		transform.position = Vector3.zero;
		transform.rotation = Quaternion.identity;
		
		// Apply camera movement.
		transform.Translate (center);
		transform.Rotate (0f, rotateY, 0f);
		transform.Rotate (rotateX, 0f, 0f);
		transform.Translate (0f,0f,-distance);
	}
}
10

Wow. I have to say - “It works!”. Thanks a lot =)
However there’s no one little problem. I can not move camera around the map and my starting position of it is 0:0:0 even if inspector positions are correct…

This is RTSCamera script:

var CamSpeed = 1.00;
var GUIsize = 25;
 
function Update () {
var recdown = Rect (0, 0, Screen.width, GUIsize);
var recup = Rect (0, Screen.height-GUIsize, Screen.width, GUIsize);
var recleft = Rect (0, 0, GUIsize, Screen.height);
var recright = Rect (Screen.width-GUIsize, 0, GUIsize, Screen.height);
 
    if (recdown.Contains(Input.mousePosition)) {
    	if (transform.position.z > 0) {
        transform.Translate(0, 0, -CamSpeed, Space.World);
        }
        
       	}
 
    if (recup.Contains(Input.mousePosition)){
  		if (transform.position.z < 400) {
        transform.Translate(0, 0, CamSpeed, Space.World);
        }
        
       	}
 
    if (recleft.Contains(Input.mousePosition)){
    	if (transform.position.x > 0) {
        transform.Translate(-CamSpeed, 0, 0, Space.World);
        }
        
        }
 
    if (recright.Contains(Input.mousePosition)){
 		if (transform.position.x < 400) {
        transform.Translate(CamSpeed, 0, 0, Space.World);   
		}
        
        }
}
11

Anyone know?