Samples

A tiny procedural Minecraft-inspired voxel dreamscape written in Rust with Bevy and wgpu.

The current vertical slice includes:

• Streamed seeded terrain: meadows, cherry groves, rocky highlands, snowy peaks, river valleys and beaches
• Underground caves, deep strata and clustered ores down to Y=-24
• Exposed-face meshes in 16×16 chunks; edits rebuild only affected chunks
• Pink-lavender distance fog, bloom, SSAO, and candy-colored lighting for depth without overloading the GPU
• GPU-animated translucent water with ripple normals and a Fresnel sky sheen (not real-time reflections)
• Shared stepped voxel canopies with real leaf gaps, inset foliage layers, pink shading, and subtle sway
• Ten-minute day/night cycle with a moving shadow-casting sun, moonlight, warm twilight, and matching sky/fog
• First-person creative flight and mouse look
• Right-click block placement with four palette materials; left-click mining
• Compact settings panel for time presets, cycle pause/resume, and fog distance
• Procedural day/night sky with sun, moon, stars, and drifting clouds
• TAA, temporal shadow filtering, and 4096-pixel directional shadow maps

Run it with:

cargo run

Every launch picks a random seed, shown in the startup log. Use MC_SEED=12345 cargo run to revisit a reproducible world. Terrain uses warped, multi-octave noise; trees have biome-dependent density and varying trunk heights. Fog presets (64/96/128 blocks) also select the chunk loading radius; chunks unload one chunk beyond it, including water and foliage. Terrain generation is budgeted to one chunk per frame; rapid travel may briefly outpace loading. There is no fixed horizontal boundary (very distant coordinates remain subject to float precision). Block edits survive unloading/reloading during this session, but are not saved to disk. The seed regenerates terrain, not previous edits.

Use MC_DAY_SECONDS=120 cargo run for a two-minute cycle (default 600 seconds).

Click the world to capture the mouse; Escape or Tab opens settings and releases it. The Settings button also opens the panel. Choose Dawn, Noon, Sunset, or Night, pause/resume the cycle, or increase fog distance (which loads more terrain). WASD moves, Shift sprints, Space flies up, and left Ctrl flies down. Left-click mines and right-click places within seven blocks. 1–4 selects a block; Q/E cycles the palette. This is creative flight, without survival gravity or collision.

Dependencies are optimized in development builds; the first build takes longer. On NixOS use nix develop first, or the supplied direnv environment.

Run cargo test for geometry/world tests. MC_CAPTURE=/tmp/prism.png cargo run saves a runtime screenshot, logs smoothed FPS after warmup, and exits automatically.

CPU meshing benchmark (fixed seed, 180 meshes): cargo test benchmark_chunk_meshing -- --ignored --nocapture.