Canalize

Canalize does not reskin vanilla terrain or tweak a few parameters. It swaps the vanilla ChunkGenerator for a separate one, and the core heightmap calculations that the original game offloads are handled inside a C++ noise engine that talks to Java through JNI. The resulting Overworld reaches up to 1744 blocks, with a full build height of 1808 blocks, which is 4.7 times the vanilla limit of 384 blocks.

Ridged fractal Brownian motion, domain warping and Worley cellular noise each shape a different part of the land. Ridged noise lays out the skeleton of mountain ranges, domain warping carves hydraulic erosion gorges and riverbeds, and cellular noise adds rocky texture to the peaks. Biome edges between ocean, plain and mountain use smoothstep interpolation instead of hard boundaries. The noise kernel is written in C++17 and uses AVX2 SIMD instructions to process 8 floats per instruction, and it is stateless and thread-safe. The added height and the extra noise work mean that generating a 1808-block world is noticeably slower than vanilla generation.