Cracks

Basic Technique

By using Combine to subtract out the Cracks output, you can cut out the pattern in the main terrain.

Nested Patterns

The default pattern may seem to geometric and simplistic. This is by design so you have broad room to make modifications.

Create 3 different nodes, one with large cracks, one with medium cracks, and one with small and combine them for a more believable effect. As a rule of thumb, you can take the largest size, right-click the Scale slider and select the Halve button. Duplicate the node and halve it again for the next node.

This may still look too simple for most usage scenarios. So you can add distortions to the nodes by using the Displace option in the Post Process Stack. This will create more natural-looking cracks.

Remember to modify the Seed property under the Displacement post process slider to make each node randomized.

When subtracting this pattern out of another terrain, you can get complex, subtle effects.

If you need more elaborate distortions in your patterns, you can add a Warp node to each Cracks node.