How can I proceduraly create the dark lines as seen in white birch (paper birch) bark?
This is the exact type of effect I'm trying to replicate. Random sized "lines" in the bark, yet they all run the same direction.
You can see in this picture, that this variation of birch has a slightly different bark pattern. Here the lines are much longer. (At this point I don't care about the random dark blobs, they are mostly knot holes, but if somebody wants to include that too... :)