In my project I'm using 2 cameras:

1. the Main Camera for the scene 3D elements;
2. a secondary camera for UI elements, which I need(?*) since I want to render 3D objects inside the UI (I followed

   Orthographic Camera

   Inspector of one of the orthographic cameras:
   

   UI Camera

   Inspector of the UI camera (also orthographic):
   

   Canvas Details

   Inspector of the canvas I'm using for the UI:
   

   I'm trying to make a sort of switch for different orthogonal projections, that makes use of different cameras to change the perspective. Therefore I made a dropdown UI element that seems to work fine: I used the gameobject.SetActive(bool) method to switch camera, even though the

   2. Orthographic Camera

   After switching camera to orthogonal (UI disappeared):

   And that's what I see in the Scene window:

   Update

   Setting the Canvas "Render Mode" to Screen Space - Overlay seems to be solving the problem, but then I'm not able to see the 3D objects in the UI:

   CodePudding user response：

   Turns out it was easier than I thought. Big thanks to

   2. After