A tutorial on this would be really helpful in my opinion, it would provide a starting point for similar ideas that others and I might have. It's a bit difficult to have a procedural tiled map with realistic and detailed textures : it gets dull or repetitive like feeling, with only some decals here and there to patch things up a little. I've discussed this with others before, and one of the issues of procedural map making is that people don't feel like the map was made with special attention for the player. While it's somewhat true, I want to be able to provide that special attention feeling to it, while keeping the infinite possibilities open. I think substances are capable of that
Thanks for your answers,
Vincent
edit : just thought about it, but maybe fractals could be a possible approach to compute continuous patterns for tiles, with tiles acting like if they were stencil windows on the global "substance"