Reproduction steps:
1. Open the attached project.
2. Play the 'main' scene in the Editor.
- You should see a sphere in the Game View.
3. Go to File > Build Settings.
4. Change platform to iOS.
5. Play the 'main' scene in the Editor.
- You should see a blank texture in the Game View.

Expected behavior
- Some type of warning about _CameraDepthTexture incompatibility on iOS
or
- Similar behavior between Standalone and iOS.

Reproduced with:
2017.2.0a1, 2017.2.1f1, 2017.3.0f2, 2018.1.0a7
Android, iOS
Different Graphics Emulation modes

Not reproducible with:
WebGL, Standalone (Windows, macOS)

Note:
Screenshots attached