Question Cannot change the main camera's culling mask while blending between two CinemachineVirtualCamera

Hello, I am trying to blend two CinemachineVirtualCameras with an "Ease in" blend and also changing the CullingMask of the main Camera at the same time. But when I'm doing it, the blending stops as soon as the cullingMask changed.

I tried putting the mask modification in a coroutine but nothing changed, the blending freezes if it isn't completed by the time the mask is changed.

Is this a bug or something normal and what should I do ?

Here is the code I use to do all this :

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class MapManager : MonoBehaviour
6. {
7.     [SerializeField] private GameObject freeLookCamera;
8.     [SerializeField] private GameObject mapCamera;
9.     [SerializeField] private LayerMask layerMask;
10.     private Camera cam;
11.     private LayerMask oldMask;
12.  
13.     void Start()
14.     {
15.         cam = Camera.main;
16.     }
17.  
18.     public void OpenMap()
19.     {
20.         oldMask = cam.cullingMask;
21.         cam.cullingMask = layerMask;
22.         freeLookCamera.SetActive(false);
23.         mapCamera.SetActive(true);
24.     }
25.  
26.     public void CloseMap()
27.     {
28.         cam.cullingMask = oldMask;
29.         freeLookCamera.SetActive(true);
30.         mapCamera.SetActive(false);
31.     }
32. }

OpenMap and CloseMap are called when I want to blend freeLookCamera and mapCamera.

Thank you for your answer !

 

Thank you, now it works perfectly !

 

From the provided code, it appears that you're changing the cullingMask property of the main camera immediately after activating or deactivating the cameras. This can cause the blending to stop prematurely because the camera blending is likely happening in the next frame update.

To ensure that the blending completes before changing the cullingMask, you can use a coroutine. However, based on your description, it seems that using a coroutine alone didn't solve the issue. In that case, you can try using a coroutine along with a delay to give enough time for the blending to finish before modifying the cullingMask.

Here's an updated version of your code that incorporates a coroutine and delay to achieve the desired blending and cullingMask modification:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class MapManager : MonoBehaviour
6. {
7.     [SerializeField] private GameObject freeLookCamera;
8.     [SerializeField] private GameObject mapCamera;
9.     [SerializeField] private LayerMask layerMask;
10.     private Camera cam;
11.     private LayerMask oldMask;
12.  
13.     void Start()
14.     {
15.         cam = Camera.main;
16.     }
17.  
18.     public void OpenMap()
19.     {
20.         oldMask = cam.cullingMask;
21.         cam.cullingMask = layerMask;
22.         freeLookCamera.SetActive(false);
23.         mapCamera.SetActive(true);
24.  
25.         StartCoroutine(BlendAndModifyCullingMask());
26.     }
27.  
28.     public void CloseMap()
29.     {
30.         cam.cullingMask = oldMask;
31.         freeLookCamera.SetActive(true);
32.         mapCamera.SetActive(false);
33.     }
34.  
35.     private IEnumerator BlendAndModifyCullingMask()
36.     {
37.         yield return new WaitForSeconds(0.1f); // Adjust the delay as needed
38.  
39.         // Additional delay to ensure the blending is completed
40.         yield return new WaitForSeconds(cam.GetComponent<Cinemachine.CinemachineBrain>().m_DefaultBlend.BlendTime);
41.  
42.         cam.cullingMask = layerMask;
43.     }
44. }
45.  

In the updated code, the BlendAndModifyCullingMask coroutine is called after activating the map camera and deactivating the free look camera. It introduces a short delay (0.1 seconds in this example) before modifying the cullingMask. Additionally, there's an extra delay equal to the blend time of the Cinemachine virtual cameras to ensure the blending is fully completed before modifying the cullingMask.

You can adjust the delay values as per your specific requirements.