Question Smooth zoom for 2D game

Hi there! I'm making a 2D top down game and I just started using CInemachine for the firs time.

I'm trying to get a smooth zoom effect working and I'm having issues.

So, right now I'm using the following code:

Code (CSharp):

1. private void Update()
2.     {
3.         if (active)
4.         {
5.             float horizontalInput = Input.GetAxisRaw("Horizontal");
6.             float verticalInput = Input.GetAxisRaw("Vertical");
7.  
8.             direction.x = horizontalInput;
9.             direction.y = verticalInput;
10.             direction = direction.normalized;
11.          
12.             velocity = direction * camSpeed * 15f;
13.             movement = velocity * Time.deltaTime;
14.  
15.             mapCam.transform.position = new Vector3(mapCam.transform.position.x + movement.x, mapCam.transform.position.y + movement.y, mapCam.transform.position.z);
16.  
17.             float zoom = Input.mouseScrollDelta.y * zoomMagnitude;
18.             mapCam.m_Lens.OrthographicSize = Mathf.Lerp(mapCam.m_Lens.OrthographicSize, mapCam.m_Lens.OrthographicSize + zoom, zoomSpeed * Time.deltaTime);
19.         }
20.     }

The zoom works (though it needs some major work) but it just snaps to the orthographic size and I wanted it to sort of smoothly transition. I have another virtual camera on the scene with a different orthographic size and when going from one camera to the other it zooms smoothly so I'm sure it can be done but I just can't figure it out.

Not sure

 

@gaborkb

Hey, thanks for the reply! Sorry I should have specified what the variables are.

zoomMagnitude

and

zoomSpeed

are just floats meant to control the rate at which each scroll on the mouse wheel zooms. I guess I really don't need both, I changed my code to the following based on your suggestion:

Code (CSharp):

1. private void Update()
2.     {
3.         if (active)
4.         {
5.             float zoom = -Input.mouseScrollDelta.y;
6.             mapCam.m_Lens.OrthographicSize = Mathf.Lerp(mapCam.m_Lens.OrthographicSize, mapCam.m_Lens.OrthographicSize + zoom * zoomMagnitude, Time.deltaTime);
7.             mapCam.m_Lens.OrthographicSize = Mathf.Clamp(mapCam.m_Lens.OrthographicSize, minZoom, maxZoom);
8.         }
9.     }

It's still not smooth except for very small values of

zoomMagnitude

. Also when I look at the Orthographic size in the inspector it seems to be changing imminently and I thought Lerp was supposed to change the value over time.

Maybe it can't be done using this method?