This is hands down one of the most fun exercises I have worked on during expression session.
All of the changes that happen in this scene, like the blur to simulate focal length of the camera, the tint to simulate the atmospheric perspective, the movement of the clouds etc, are done automatically by calculating the distance between the camera and the mountains/clouds.
The sky also changes its color based on where the sun is located. Check out a little bit of BTS below. :)
Camera's movement controlled using a slider which inturn controls everything else.
Clouds moving on x-axis based on the camera movement
Changing the focal plane using the slider which controls the blur that we see on screen.
Changing tint amount to reduce or increase the sense of atmospheric perspective.
Thank you for reading this :)