Zooming limit in unity mobile. Perspective Camera - unity3d

Question

I'm trying to limit the zoom value of my game to a minimum and a maximum but i can't get how to do it!
I've been trying by limiting the Y according to the zoom factor but it does not work properly, because when it reaches the limit, it starts flickering, like it hit an obstacle. I found some things that can solve this problem by using the fieldofview, but I need it to work with the Y limitations!
I also want to add a panning limit, so that the player won't be able to see the end of the map but I didn't get there yet.
Anyways, here is the code i'm using and would appreciate if someone could help!
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
class ScrollAndPinch : MonoBehaviour
{
#if UNITY_IOS || UNITY_ANDROID
public Camera Camera;
public bool Rotate;
protected Plane Plane;
public float scrollSpeed;
public float rotateSpeed;
public float zoomSpeed;
public float zoomMinY;
public float zoomMaxY;
public float camsummer;
Vector3 pos;
private Vector3 velocity = Vector3.zero;
private void Awake()
{
if (Camera == null)
Camera = Camera.main;
Rotate = true;
scrollSpeed = 50f;
rotateSpeed = 50f;
zoomSpeed = 1f;
zoomMinY = 50f;
zoomMaxY = 200f;
camsummer = 0.1f;
pos = new Vector3(0f, 0f, 0f);
}
private void Update()
{
//Update Plane
if (Input.touchCount >= 1)
Plane.SetNormalAndPosition(transform.up, transform.position);
var Delta1 = Vector3.zero;
var Delta2 = Vector3.zero;
//Scroll
if (Input.touchCount == 1)
{
Delta1 = PlanePositionDelta(Input.GetTouch(0));
if (Input.GetTouch(0).phase == TouchPhase.Moved)
Camera.transform.Translate(Delta1 * scrollSpeed * Time.deltaTime, Space.World);
}
//Pinch
if (Input.touchCount == 2)
{
var pos1 = PlanePosition(Input.GetTouch(0).position);
var pos2 = PlanePosition(Input.GetTouch(1).position);
var pos1b = PlanePosition(Input.GetTouch(0).position - Input.GetTouch(0).deltaPosition);
var pos2b = PlanePosition(Input.GetTouch(1).position - Input.GetTouch(1).deltaPosition);
//calc zoom to be done relative to the distance moved between the fingers
var zoom = (Vector3.Distance(pos1, pos2) /
Vector3.Distance(pos1b, pos2b));
//edge case (Bad calculation)
if (zoom == 0 || zoom > 10)
return;
//Move cam amount the mid ray. This is where the zoom is applied
// Vector3 pos = Camera.transform.position;
// pos.y = Mathf.Clamp(pos.y, zoomMinY, zoomMaxY);
// Camera.transform.position = Vector3.Lerp(pos1, Camera.transform.position, (1 / zoom));
// Camera.transform.position = pos;
if (Camera.transform.position.y < zoomMinY | Camera.transform.position.y > zoomMaxY)
{
// Camera.transform.position = pos;
Camera.transform.position = Vector3.SmoothDamp(Camera.transform.position, pos, ref velocity, camsummer);
// Camera.transform.position = Vector3.LerpUnclamped(Camera.transform.position, pos, camsummer);
// for (int i = 0; i < 1000; i++)
// {
// }
}
else if (Camera.transform.position.y >= zoomMinY && Camera.transform.position.y <= zoomMaxY)
{
pos = Camera.transform.position;
Camera.transform.position = Vector3.LerpUnclamped(pos1, Camera.transform.position, (1 / zoom));
//This is where the rotation is applied
if (Rotate && pos2b != pos2)
Camera.transform.RotateAround(pos1, Plane.normal,
Vector3.SignedAngle(pos2 - pos1, pos2b - pos1b, Plane.normal) * rotateSpeed * Time.deltaTime);
}
// pos.y = zoomMinY;
}
// if (Camera.transform.position.y > 200)
// {
// zoomMaxY.y = 200;
// Camera.transform.position = zoomMaxY;
// }
// else if (Camera.transform.position.y < 50)
// {
// zoomMinY.y = 50;
// Camera.transform.position = zoomMinY;
// }
// else if (Camera.transform.position.y >= 50 && Camera.transform.position.y <= 200)
// {
// Camera.transform.position = Vector3.LerpUnclamped(pos1, Camera.transform.position, (1 / zoom));
// }
// Vector3 Cam = Mathf.Clamp(Camera.transform.position.y, zoomMinY.y, zoomMaxY.y);
// if (Camera.transform.position.y > zoomMaxY || Camera.transform.position.y < zoomMinY)
// {
// Vector3 camLimit = Camera.transform.position;
// camLimit.y = Mathf.Clamp(Camera.transform.position.y, zoomMinY, zoomMaxY);
// Camera.transform.position = camLimit;
// // Vector3 camLimit = Camera.transform.position;
// // camLimit = (transform.position.);
// // Camera.transform.position = camLimit;
// }
// else if (Camera.transform.position.y >= zoomMinY && Camera.transform.position.y <= zoomMaxY)
// {
// Camera.transform.position = Vector3.LerpUnclamped(pos1, Camera.transform.position, (1 / zoom));
// }
}
protected Vector3 PlanePositionDelta(Touch touch)
{
//not moved
if (touch.phase != TouchPhase.Moved)
return Vector3.zero;
//delta: How far have we moved from A to B by sliding the finger
var rayBefore = Camera.ScreenPointToRay(touch.position - touch.deltaPosition);
var rayNow = Camera.ScreenPointToRay(touch.position);
if (Plane.Raycast(rayBefore, out var enterBefore) && Plane.Raycast(rayNow, out var enterNow))
return rayBefore.GetPoint(enterBefore) - rayNow.GetPoint(enterNow);
//not on plane
return Vector3.zero;
}
protected Vector3 PlanePosition(Vector2 screenPos)
{
//position
var rayNow = Camera.ScreenPointToRay(screenPos);
if (Plane.Raycast(rayNow, out var enterNow))
return rayNow.GetPoint(enterNow);
return Vector3.zero;
}
private void OnDrawGizmos()
{
Gizmos.DrawLine(transform.position, transform.position + transform.up);
}
#endif
}
And to make it easier to see, this is the part I am struggling to make it work.
if (Camera.transform.position.y < zoomMinY | Camera.transform.position.y > zoomMaxY)
{
Camera.transform.position = Vector3.SmoothDamp(Camera.transform.position, pos, ref velocity, camsummer);
}
else if (Camera.transform.position.y >= zoomMinY && Camera.transform.position.y <= zoomMaxY)
{
pos = Camera.transform.position;
Camera.transform.position = Vector3.LerpUnclamped(pos1, Camera.transform.position, (1 / zoom));
//This is where the rotation is applied
if (Rotate && pos2b != pos2)
Camera.transform.RotateAround(pos1, Plane.normal,
Vector3.SignedAngle(pos2 - pos1, pos2b - pos1b, Plane.normal) * rotateSpeed * Time.deltaTime);
}

Answer 1

Does this happen when the camera gets close to an object?
If so change the near clip plane distance on your camera to.near = 0
That should stop it from not showing the gameobject, if ur camera keeps moving it might cause the flickering because it clips in and out of the near clip plane