Detect scene out of camera.

Hi, I’ve three scenes of resolution 640*960, at click I scroll down one scene and the other comes down on its place, I want to know when my first scene went out of the camera. All scenes don’t have attached any type of renderer with them. I want to detect scene out of camera without any renderer.

I don’t understand what you mean. You can only have one scene loaded at a time.
Scene is the “stage” you have loaded up and running at the time.
Do you mean just a specific region/area you have in your scene?
If so, you can do a raycast from the camera to see if it hits what you want.
If it does, then it’s not out of camera. If it doesn’t, then it’s out of the camera’s view.