Hi. The best(fastest to render) way to use the crack files I uploaded is to link them up in your network between 'compute terrain' and 'base colours'. Take a line from compute terrain, plug it into the leftmost input of the cracks node then, take a line out of the cracks node and plug that into the leftmost input of the base colours node.
If you need a *really* accurate crack calculation to be done on your terrain group to use further down the chain, insert the cracks before the compute terrain node. This will roughly quadruple the render time for them, although, they won't actually be any different visually.
