Terrain development in Minecraft relies on large, deeply nested JSON structures that quickly become difficult to read and maintain. Rhombus introduces powerful abstractions and a comprehensive Python API, making world generation code cleaner, more modular, and significantly faster to develop.

Rhombus is an eDSL delivered as a Python package that allows worldgen developers to comfortably write expressions resembling the abstract syntax trees of density functions for Minecraft while benefiting from Python's forgiving syntax.

_{This project is pretty similar to misode/gaia-beet, which you might also find useful. Know that I started developing Rhombus before I knew about it, the similarities in concept are quite frightening though. The biggest difference to Misode's gaia-beet is that Rhombus does not see itself as a mere Beet plugin — although we heavily rely on it — but rather as a coherent, mostly separated language and it will be further developed and improved in exactly this sense.}

Key Advantages

• 📦 Object-oriented Design
  Full use of Python’s object model for composing, reusing, and structuring density functions.
• 📝 Native Comments
  Since Python code is in use, comments work naturally without any custom syntax.
• 📖 Integrated Documentation
  Functions and classes provide docstrings describing behavior, parameters, and usage.
• ⚡ Performance Optimization
  Recurring expressions and resource intense operations can be cached automatically.
• 🗄️ Macro Library
  Growing collection of macros for common patterns and complex operations, reducing boilerplate and improving readability.

Impressions

pip install rhombus

from rhombus import *

continent_noise = Noise(-10, [2, 1, 2, 2, 2, 1, 1, 1, 1])
erosion_noise   = Noise(-9, [3.5, 0, 2, 4, 2, 2, 3])

erosion = clamp(noise(erosion_noise, xz_scale=1.3, y_scale=0) - 0.1, min=-1, max=1)

height_map = spline(erosion, [
    (-1,    -1,     0),
    (-0.6,  -0.95,  0),
    (-0.61, -0.6,   0),
    (-0.2,  -0.55,  0),
    (-0.21, -0.2,   0),
    ( 0.05, -0.2,   0),
    ( 0.21,  0.2,   0),
    ( 0.6,   0.3,   0),
    ( 0.61,  0.8,   0),
    ( 1,     0.8,   0)
])

FINAL = maps.extrude_heightmap(height_map, (-1, 0.8), (64, 256))