Hi! Excuse the delay to answer you. Well, the sky will function normally because it works directly as a skybox. The fog scattering effect will only affect objects in the scene that draw to the depth buffer, the operating mode of the fog scattering is similar to the "Global Fog" image effect that comes with Unity. Often developers make their plugins to draw to the depth buffer. So the only requirement for the fog works properly is this. I've had the opportunity of testing World Composer with azure[Sky] and it worked perfectly, so I think it also works with Terrain Composer. Horizon[On] I never tested it, but I intend to buy it today and I will do the test. If it works I will create a Web Player demo.