Many thanks for the improvement on this!
I am catching up with the various updates (regarding both TG and Classic Erosion) and enjoy both. Really glad to see the new features implemented here.
Being able to export the maps and to normalize them is a really nice feature, and the river mode is giving me excellent result. General erosion also look really believable! Really well done.
Regarding this, I think I have spotted a bug leading to an inevitable crash: Starting with a fresh instance of TG, adding an erosion node in river mode and saving the .erd file to a disk. If I try to load the same file or reload the scene TG becomes unresponsive and I have to kill it. Look like it is related to the river mode as the default mode is fine. I also find myself having to erode several time my scene before resulting in the expected result. Looks like enabling/disabling the node or restarting the scene results in seed change (despite the seed stating the same in the related input field).
I am running Terragen 4.3.18 with Classic Erosion 1.1.1 on a windows 7 64bit machine.
Also one last note about the normalize maps: at the moment it looks like you are doing this internally inside the node itself. However the saved maps are not normalized. So if you were to save and load the map elsewere, it would look quite different. Also normalizing the map on export would optimize the usage of the file's bit depth
going back to play with it now!