Simplex Terrain Generation Mod 1.16.5, Mechanics & Implementation

The mod operates by intercepting the chunk generation phase. It calculates a 16x16 grid of height values for every chunk.

1. Sampling: The engine samples the configured noise at the X/Z coordinates.
2. Modification: Any active Noise Modifiers are applied to the sample.
3. Post-Processing: The heightmap is passed through erosion or smoothing filters.
4. Block Placement: The engine fills the column from Y=0 to the calculated height. By default, it uses Stone as the filler, Dirt as the sub-surface, and Grass as the top layer, though these are biome-dependent.
5. Decoration: Standard Minecraft features (trees, ores, structures) are then placed on top of the generated surface.