I had just applied the "Bryce Blue-Green" to the terrain with two white spotlights aiming down at the spheres (softened the spotlights edges to about 15), this was all just to see if I could get the basic setup to work. But, I'm not sure what material the author used for the terrain since it almost white in the spotlight and then purplish to black as it approaches the camera. Probably just a slightly reflective off-white, so it would mimick the color of the sky where the spotlights are weakest.

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