> If you do chunks and generate the edges first, you could run into a situation where it's impossible to fill the chunk based on it's edges.
Yes, to solve that I generated world in 2 stages - first decided which tiles are solid (using simplex noise so it was consistent), then decided "decorations" (what exact thing is in each solid tile - tree, building part, roof, stairs, etc). Most tiles were empty, tiles with nothing beneath were platforms, tiles with nothing above and something below were roofs or tree tops, etc. Where there were decisions to be made I sampled random number generator in constant order for given chunk. That, combined with seeding the generator basing on chunk coordinates meant it always generated same stuff for a given chunk, no matter which path you took to arrive to this chunk.
The problem was - there were a lot of such rules to specify, and if I only specified the few rules that were needed for consistent world - then the generated worlds were very repetative. When I added more tiles specifying rules for all combinations were too much, so I wanted it to learn rules by itself by analysing handmade maps and then tryign to use that in 2d markov chains, but I never got it to work well, and it was my master's thesis, so I just wanted to be done with it at this point ;)
Yes, to solve that I generated world in 2 stages - first decided which tiles are solid (using simplex noise so it was consistent), then decided "decorations" (what exact thing is in each solid tile - tree, building part, roof, stairs, etc). Most tiles were empty, tiles with nothing beneath were platforms, tiles with nothing above and something below were roofs or tree tops, etc. Where there were decisions to be made I sampled random number generator in constant order for given chunk. That, combined with seeding the generator basing on chunk coordinates meant it always generated same stuff for a given chunk, no matter which path you took to arrive to this chunk.
The problem was - there were a lot of such rules to specify, and if I only specified the few rules that were needed for consistent world - then the generated worlds were very repetative. When I added more tiles specifying rules for all combinations were too much, so I wanted it to learn rules by itself by analysing handmade maps and then tryign to use that in 2d markov chains, but I never got it to work well, and it was my master's thesis, so I just wanted to be done with it at this point ;)