Here's how I go about creating my cracks. Super controllable. Allows you to affect size, slope, balance, variation etc...
I used this in my Cracked Concrete material found here.
You may have to DL the image or zoom in super far to read it. Its big. Its also not the lightest method of doing it, but hey, it works. ;)
Let me know if you like this, or if you'd like to know more!
Link in case image doesn't work.
More thoughts:
- You could mask out islands based off their BBox value, and use the empty space for dirt, and mud.
- You could plug in a more primitive Primary crack to influence the sub cracks along it.
- You could use this to create a cool peeling paint material.
- This looks great when displaced across tiles/bricks!
- Use the cracks to drive a tile sampler to place debris, weeds, rocks etc along the cracks' edges.
Have fun!