We're a small team, so it's critical that we find ways to be efficient with every part of production.
We love to find simple yet powerful building blocks that can be reused in different ways. Here's a great concept that Paul came up with - a straightforward way of adding rim-lighting to all our objects in the world.
On top of our base cloud texture there's an additional lit layer. By masking this off based on a blurry light source texture, we can get a lovely effect as the light passes over it. This can potentially be used for everything in the game - the mountains themselves, the clouds as shown below, as well as trees, buildings, and perhaps even characters.