For example if my generated levels look roughly like this:
But once in a while I would like to have the "amplitude" rise say 10 times than the rest of the level, so that it would look something like:
That is, once in a while there are deep "trenches" in the level. Now I know that my terrain's Y values are always between for example 200 and 1000 pixels. I there a way for them to mostly be in that range, but once in a while there is a drop to for example 10000 pixels?