I want to mix 3D and 2D scenes in my game, so one scene might have a top down view with entirely pixel art, but when the player is in a different scene it's at a different angle and has 3D elements. However, when I run my 3D scene it just shows a grey screen. I've added a camera and the preview works fine. I've also tried doing the same thing in a project that only has one 3D scene and the game works perfectly. So I think what's happening is that the 3D scene is running as a 2D scene, though I might be wrong about that. This is my first time using Godot 3D so I don't really know much about it.
EDIT: I've checked to see if it works if I start a project with a 3D scene and then add a 2D scene, and it works fine. But most of my game will likely be in 2D, so this doesn't really fix my problem.
