FOSS gamedev and creative worlds

I want to create something like that :

https://www.youtube.com/watch?v=FRrQSDqU-T4

Problem is, if you use nodeboxes to define a node, if will not tile correctly side by side other blocks, there will be gaps between adjacent nodes.

What i need is conditional rendering : use nodebox-N based on the present or absence of nodes at each cardinal point from the node being rendered...

If your main issue is the tiling, you can just make the node box larger than one block.

This is sort of doable right now, and done. Just register all combinations of nodes you need, and change the nodes on changes of the map.