I used to use a 3D world program called Bryce. That has a terrain editor which can apply a variety of natural processes to your heightmap, including different types of erosion. Since it uses grayscale files, there's no reason they couldn't be imported into CAW. If you feel like going as far as picking up an extra 3D app, that is Didn't used to be particularly expensive though, dunno about now
there are a number of apps around now that can do various kinds of effects many are either free or have a free version which is typically limited to creating output of smaller sizes, for S3 purposes you couldn't use a larger one anyway. lansderf, Terragen 1 and 2 for eg,
C'est la vie, they say, because they can't change their world, but, we can! That's why we have CAW! :rolleyes:
I used to love Bryce! I'll have to check into the free version to see about exporting the height maps. From what I remember, it was fairly easy - a lot easier than CAW - to create realistic landforms, although its object placement capabilities (at least in the earlier versions - I was using 3.0!) were limited. If you're just using it for heightmaps, though, that's not a problem!