I am modeling terrain for 3D printing in Shapeway’s full color sandstone. Starting from the basic shape, I would like to add some displacement and texture, say little pieces of rock and some grass patches.
What is a good source for a displacement map + color texture?
In terms of detail quality in the final model the displacement map will likely not be the limiting factor but the 3D printing method itself. “Full color sandstone” is just a fancy name for a gypsum printer – the samples provided on the Shapeways site should give an idea of the surface /color detail to expect. The two cartoony models in the middle work pretty well, they consist of cleanly separated parts. Smaller detail and more subtle transitions will likely not appear, unless you print at large scale.