Nuit 1.0.0-beta.5 for Minecraft 1.21.1

This is the first Nuit beta for Minecraft 1.21.1. It replaces FabricSkyBoxes 0.7.4 on this Minecraft line and completes a backport of the current Nuit feature set.

Migration note: Nuit is the successor to FabricSkyBoxes, not a drop-in update. The mod ID, Java API packages, and native resource-pack format have changed. Existing FabricSkyBoxes, OptiFine, and MCPatcher packs require Nuit Interop.

Added

• Added per-skybox properties.clock sources for fades and uniform rotation.
• Clock sources can use "default", "game_time", or a fixed clock.
• Added synchronization between eligible rotating sun decorations and Minecraft's sunrise, sunset, and atmospheric fog direction.
• Added NeoForge support alongside Fabric through a shared multiloader codebase.
• Added Nuit's schema-based skybox format with overworld, end, monocolor, square-textured, multi-textured, and decorations skybox types.
• Added keyframe-based fades and rotation, configurable fog, layer ordering, animated textures, and biome, dimension, sky type, weather, effect, and coordinate conditions.
• Added optional frame interpolation for multi-textured animations, including an Iris-compatible fallback.
• Added visibleUnderwater so individual skyboxes can opt out of underwater rendering.
• Added a client API for registering custom skybox types and managing reloadable or permanent runtime skyboxes.
• Added German, Hungarian, Malay, and Malay (Jawi) translations.

Changed

• Sun decorations with conflicting clock or rotation settings now fall back to the dimension's normal celestial direction and emit one warning.
• Rotation durations must now be at least one tick, and the schema documentation now explains clock and rotation behavior.
• Reduced per-frame rendering overhead by skipping fully transparent skyboxes and avoiding unused animation work.
• Renamed the project and mod ID from fabricskyboxes to nuit. Native skybox definitions now load from assets/nuit/sky/**/*.json.
• Made fade optional and removed the old alwaysOn field. Empty fade keyframes now mean the layer remains visible while its conditions pass.
• Renamed the conditions field from weathers to weather, expanded weather matching, and made numeric ranges use [min, max) bounds.
• Changed the default rotation axis to Y.
• Updated the logo, metadata, schema documentation, and API guide for the Nuit beta line.

Fixed

• Restored historical rotation behavior: skyboxRotation: false follows Minecraft's celestial angle, skyboxRotation: true uses uniform clock rotation, and speed: 0 disables time-based rotation.
• Prevented moon-only and stars-only decoration layers from controlling sunrise and fog orientation.
• Restored the intended default for multi-textured animations: interpolate is now false unless explicitly enabled.
• Fixed texture and skybox cleanup during reloads, preventing stale resources and memory leaks.
• Fixed resource reloads being applied before asynchronous preparation completed.
• Fixed decoration textures not being registered before rendering.
• Fixed monocolor rendering and cyclical fade interpolation.
• Fixed custom sun, moon, and star layers disappearing during rain or snow and corrected sunrise/sunset alpha handling.
• Fixed dimension and world exclusion checks, blocked-environment conditions, weather conditions, and condition transition behavior.
• Fixed NeoForge debug-screen initialization and improved compatibility with Iris frame interpolation.

Compatibility

• The clock property is optional; the current dimension's normal clock remains the default.
• Minecraft 1.21.1 predates named World Clocks. Named clock identifiers and clock or world_clock objects are rejected; use "default", "game_time", or a fixed clock instead.

Full Changelog: https://github.com/FlashyReese/nuit/compare/mc1.20.5-0.7.4...mc1.21.1-1.0.0-beta.5