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The program only accepts .vox.   Formats like obj and stl could be any mesh, so there's no way to guarantee that they represent voxel models, or conveniently shaped tiles of any kind.

The program doesn't export maps.  The idea is that Generate Worlds is that walking around experience.  Because it's not a static exported map, you get to seamlessly explore an infinite world that's built around you.

If you're inclined to write software for VR or browser, the algorithm that powers Generate Worlds is public.  I've written it up here, so you could use that to implement it for any platform.  If you have questions about the algorithm, shoot me an email!

Hello!  Generate worlds currently doesn’t export maps.  The idea is to let you explore an infinite world directly.  If it does support some kind of export in the future, what format would you want the exported map to be in?  It also would be great to know any other information about your use case.

I just updated generate worlds to address the two bugs you saw.  You should no longer see CPU usage after closing the application and an error message should appear if you try to load tiles from a folder with no .vox files in it.  Please download it again and give it a shot.  A future update will improve the file browsing window.

The system automatically decides which tiles match by seeing if they match in color along their edges.  If you can put two tiles next to each other and all the cubes that are touching are the same color or empty, then those two tiles can be placed together.

Please tell anyone you talk to who’s using Generate Worlds to feel free to post comments here with questions.  I want to make sure people aren’t getting stuck and to improve things that are giving them trouble.

Thank you so much for downloading and for this feedback!  I don’t have any control over the payment process unfortunately, but I’m glad you got through. I’ll work on the issues you reported and comment again when they’re addressed.