Project Atmosphere 0.9.1 Alpha

Atmospheric Continuity Update

Project Atmosphere 0.9.1 improves weather persistence, seasonal behavior, pressure logic, cyclone formation, cloud simulation, and debug tools.

This update is mostly backend focused, but it builds the foundation for future weather systems.

Persistent Atmosphere

Weather now survives server restarts instead of resetting to forecast defaults.

Persistent systems include:

• Temperature
• Humidity
• Pressure
• Wind
• Cloud water
• Cloud cover
• Rain intensity
• Ocean state
• Cyclone state
• Seasonal drift
• WeatherCells

Weather now continues evolving between play sessions.

Forecasts And Seasons

Forecasts now act as a climate baseline instead of being regenerated during normal season changes.

Forecast regeneration is now limited to missing data, corrupt data recovery, and admin or debug commands.

Season changes now gradually influence the live atmosphere instead of rebuilding it.

Stored forecasts are now season neutral. The current season offset is applied when forecast targets are sampled, so the atmosphere follows the current season instead of stale values.

Season compatibility was also improved through the season delegate system.

Pressure Lifecycle

Pressure behavior was reworked so stale low pressure does not last forever, while real weather systems can still persist.

Pressure now follows a cleaner lifecycle:

• Forecast pressure remains the dynamic target
• Active low pressure systems can persist
• Unsupported stale lows recover slowly
• Pressure gradients remain meaningful
• Pressure is no longer forced back to normal

Unsupported low pressure recovery is capped at 2 hPa per Minecraft day and is resisted by rain, storms, cyclones, ocean influence, wind, humidity, cloud water, and convergence.

Cyclone Seeds

Cyclone formation was reworked so weak low pressure disturbances can form earlier.

The new lifecycle separates weak seed formation, cyclone intensification, and severe storm development.

Cyclone seeds now depend more on low pressure anomaly, humidity, cloud water, convergence, wind organization, and moisture sources.

WeatherCells And Rain Cells

A new WeatherCell layer was added between the persistent atmosphere and future weather effects.

Only Rain Cells are active for now, but this system is planned to support future thunderstorms, supercells, cyclones, and blizzards.

Rain Cells can now:

• Form from atmospheric support
• Move with wind
• Age and decay naturally
• Increase local rainfall
• Consume cloud water
• Persist across restarts

Clouds

Cloud formation now better accounts for humidity, cloud water, temperature, pressure, and wind convergence.

Cloud water consumption and balancing were improved to reduce runaway humidity and excessive cloud growth.

Dedicated Server Stability

Several cloud related client and server issues were fixed.

This includes better dedicated server safety, improved client gating for cloud sync, and removal of client cache references from common server code.

Debug Tools

Debug tools now expose more details about seasonal targets, pressure recovery, cyclone seed eligibility, storm support, ocean influence, wind pressure mixing, and live vs forecast deltas.

New debug commands:

/pa debug cyclone
/pa debug cyclone current
/pa debug cyclone region
/pa debug cyclone nearest
/pa debug cyclone list
/pa debug pressure
/pa debug pressure current
/pa debug pressure region

Summary

Project Atmosphere now treats forecasts as the climate baseline and the persistent atmosphere as the live evolving weather state.

Season changes no longer rebuild the atmosphere.

Pressure, wind, rain, cloud water, cyclones, ocean influence, and seasonal drift now persist and evolve more naturally over time.

Update 0.9.1 Alpha will be released tomorrow night.

I need to head to bed now,

Thanks for your patience.

Project Atmosphere v0.9.0.1-a Changelog

Added

SSP min version 5.1.2

Changed

• Added the local biome temperature to the weather sampler's region data, so that it can be used for more accurate temperature-based effects. This is used by SSP v5.1.2 to provide more natural temperature variation for player-level atmospheric effects based on the local environment, such as biome and elevation.

Fixed

• Fixed a crash because of bad versioning with SSP v0.5.1.1. (It was supposed to be 5.1.1, but I accidentally named it 0.5.1.1)

Removed

Project Atmosphere 0.9.0.0-a Alpha Release

Project Atmosphere 0.9.0.0-a is now available as an alpha release on CurseForge and Modrinth.

This is an early testing build for the upcoming 0.9.0.0 update. Some features are unfinished, unstable, or still being heavily changed. Bugs, visual issues, crashes, and performance problems are expected.

If you test this version, please report bugs and share your thoughts. Feedback from this alpha will help improve the final 0.9.0.0 release.

New Module: Fog

FOG is now part of Project Atmosphere.

It is fully dynamic and does not spawn anything. It appears naturally based on atmospheric conditions.

Dry biome: no fog
Humid biome: light fog
Wet biome or rain: dense fog

Rainbows and Auroras Rework

The whole system has been rebuilt.

The old vanilla based hooks were replaced with a full Project Atmosphere driven system.

A shared client sky state/controller was added.

Effects now use:

humidity
cloud cover
temperature
sky clarity
recent rainfall
sun visibility
time of day

Smoothing and hysteresis were added to prevent flickering.

Duplicated and outdated logic was removed.

Rainbows and auroras now feel more natural and fully integrated into the atmosphere instead of being patched on top.

Local Temperature System

Added local temperature support for Serene Seasons Plus.

Project Atmosphere now separates regional temperature from local temperature.

Regional temperature is used for large scale forecast logic.

Local temperature is used for player level atmospheric conditions.

This allows more natural temperature variation depending on the local environment.

Tornadoes

Tornadoes are currently in alpha state.

They are expected to be buggy, unstable, and heavy on FPS in some situations.

The system is still very new. Unlike mods such as PMWeather or Weather2, which have had years of development and refinement, Project Atmosphere’s tornado system is still at an early stage.

Most of the tornado rendering uses custom GLSL shaders, and I only started learning GLSL around three months ago. The current result is already a big step forward, but there is still a lot of work to do regarding visuals, performance, stability, and Simple Clouds integration.

Please be indulgent with tornado related bugs during this alpha phase.

Current limitations:

The top part does not always connect properly with Simple Clouds
Tornado rendering can be heavy on FPS
Some visual behavior is still experimental
Bugs and instability are expected

New system:

Up to 3 active tornadoes at once
Slot based tornado logic
Slots unlock after 30, 50, and 70 minutes
Each slot has a 60 minute cooldown

Tornadoes can currently damage:

glass
leaves
wood

A new rendering method was also added.

Hurricanes

Hurricanes will not be released in the 0.9.0.0 update.

The base rendering prototype is working, but the feature is not ready for release yet.

Current result is still too experimental and needs more work before being shown or included.

Major Code Cleanup

A huge cleanup was made in the codebase.

Several classes were changed, renamed, merged, or restructured.

Duplicated logic, outdated systems, old hooks, and legacy code paths were removed.

This update gives Project Atmosphere a cleaner foundation for future systems and makes the code easier to maintain.

Looking Ahead

A major update will soon be revealed and will once again overhaul Project Atmosphere.

This upcoming update focuses on pushing atmospheric simulation even further, with significant changes planned across multiple systems.

More details will be shared as development progresses.

Feedback Wanted

Since this is an alpha release, feedback is very important.

Please report:

bugs
crashes
performance issues
visual glitches
weather generation issues
tornado behavior problems
Simple Clouds integration issues
general thoughts and suggestions

Thank you to everyone testing Project Atmosphere 0.9.0.0-a.

Project Atmosphere

Changed

• Reworked wind handling across the mod to remove inconsistencies and ensure all systems use the same wind source and direction convention.
• Wind particles now sample wind every tick at their own position and smoothly steer toward it, producing real bending instead of straight trajectories.
• Player wind influence now uses Weather2-style steering applied after input, with a noticeable effect only above 11.1 m/s.
• Non-player living entities use a separate steering path with optional gust blending and higher drift caps.
• Wind direction vectors are now consistent across particles, entity forces, and SimpleClouds cloud drift.
• Cloud regions now apply a stable per-cloud direction bias plus slow wobble and slight speed variance to reduce apparent stacking.
• Temperature clamping now logs a debug warning with context and stack trace to track runaway sources.
• Server commands are now registered under the /pa root (for example /pa temperature and /pa spawnTornado).
• Wind-driven neighbor mixing now clamps its factors and deltas to stop runaway temperature spikes from spreading.
• Added weather snapshot and world-effects hooks, including rain-driven fire/campfire extinguish, cauldron filling, and dense-cloud sunburn suppression.
• Region fallback generation now ensures biome keys are present and regenerates any regions that contain only min/max clamp values.
• Wind steering now ramps near the threshold so low winds no longer slow the player.
• World effects skip sampling when no rain is present and no custom effects are registered, reducing tick load.
• Wind drift now applies as a directional add without reducing existing player speed.
• Player wind now uses intermittent gust impulses (no conveyor steering), with configurable thresholds and caps.
• Wind particle steering now caches region wind samples per tick to reduce client overhead.
• Client cloud culling now uses a single pass per tick to avoid quadratic scans.
• Creative/spectator players are immune to wind gusts, and gust impulses no longer reduce current player speed.
• Sprinting players now ignore gusts unless winds reach extreme thresholds.
• Surface wind now comes from the low-wind layer and no longer treats gust headroom as baseline speed.
• Reduced default wind push scales and player gust caps by ~3x for gentler movement impact.
• Thermometer now syncs the client day-forecast temperature so it no longer shows the 0.5 fallback.
• Instrument readouts now use server-side values in multiplayer instead of showing default client fallbacks.
• Storm sirens now play the severe-storm sound only once per continuous storm event.

Fixed

• Fixed a wind particle crash.
• Fixed wind speed being far too low due to a unit mismatch in the wind equation (hPa vs Pa), which was suppressing the computed wind magnitude.
• Fixed a 90° wind direction offset caused by inconsistent sin/cos mapping between systems.
• Fixed wind fallback behavior and cleaned up wind selection usage to reduce edge-case inconsistencies.
• Wind forces now respect exposure, skipping entities in water or lava, under cover, or colliding horizontally.

Notes

• Storms have been observed spawning again in testing (cumulus clouds and a wall cloud), so storm generation appears to be working correctly.
• Please report any unusual wind behavior, particle issues, or storm spawning problems so I can continue monitoring and tuning.

Project Atmosphere

Changed

• Reworked wind handling across the mod to remove inconsistencies and ensure all systems use the same wind source and direction convention.
• Wind particles now sample wind every tick at their own position and smoothly steer toward it, producing real bending instead of straight trajectories.
• Player wind influence now uses Weather2-style steering applied after input, with a noticeable effect only above 11.1 m/s.
• Non-player living entities use a separate steering path with optional gust blending and higher drift caps.
• Wind direction vectors are now consistent across particles, entity forces, and SimpleClouds cloud drift.
• Cloud regions now apply a stable per-cloud direction bias plus slow wobble and slight speed variance to reduce apparent stacking.
• Temperature clamping now logs a debug warning with context and stack trace to track runaway sources.
• Server commands are now registered under the /pa root (for example /pa temperature and /pa spawnTornado).
• Wind-driven neighbor mixing now clamps its factors and deltas to stop runaway temperature spikes from spreading.
• Added weather snapshot and world-effects hooks, including rain-driven fire/campfire extinguish, cauldron filling, and dense-cloud sunburn suppression.
• Region fallback generation now ensures biome keys are present and regenerates any regions that contain only min/max clamp values.
• Wind steering now ramps near the threshold so low winds no longer slow the player.
• World effects skip sampling when no rain is present and no custom effects are registered, reducing tick load.
• Wind drift now applies as a directional add without reducing existing player speed.
• Player wind now uses intermittent gust impulses (no conveyor steering), with configurable thresholds and caps.
• Wind particle steering now caches region wind samples per tick to reduce client overhead.
• Client cloud culling now uses a single pass per tick to avoid quadratic scans.
• Creative/spectator players are immune to wind gusts, and gust impulses no longer reduce current player speed.
• Sprinting players now ignore gusts unless winds reach extreme thresholds.
• Surface wind now comes from the low-wind layer and no longer treats gust headroom as baseline speed.
• Reduced default wind push scales and player gust caps by ~3x for gentler movement impact.
• Thermometer now syncs the client day-forecast temperature so it no longer shows the 0.5 fallback.
• Instrument readouts now use server-side values in multiplayer instead of showing default client fallbacks.
• Storm sirens now play the severe-storm sound only once per continuous storm event.

Fixed

• Fixed a wind particle crash.
• Fixed wind speed being far too low due to a unit mismatch in the wind equation (hPa vs Pa), which was suppressing the computed wind magnitude.
• Fixed a 90° wind direction offset caused by inconsistent sin/cos mapping between systems.
• Fixed wind fallback behavior and cleaned up wind selection usage to reduce edge-case inconsistencies.
• Wind forces now respect exposure, skipping entities in water or lava, under cover, or colliding horizontally.

Notes

• Storms have been observed spawning again in testing (cumulus clouds and a wall cloud), so storm generation appears to be working correctly.
• Please report any unusual wind behavior, particle issues, or storm spawning problems so I can continue monitoring and tuning.

Project Atmosphere 0.8.0.0

Project Atmosphere 0.8.0.0 continues the large internal refactor of the forecast and runtime systems, focusing on simulation stability, improved diagnostics, and better atmosphere state correctness.

This update stabilizes the new region-first runtime architecture while introducing deeper telemetry tools and improved safeguards for live atmospheric evolution.

Note:
This update is temporarily incompatible with PA x TFC.
A compatibility update is already planned and will restore support soon.

Changes

Forecast and Runtime

• Continued the transition to a region-first forecast runtime architecture.
• Reduced reliance on legacy biome-key runtime systems.
• Forecast baselines have been stabilized as part of the ongoing refactor.

Atmosphere Simulation

• Added humidity budget instrumentation, including ocean and wind integration.
• Completed the cloud-water coupling system for humidity simulation.
• Added pressure restore toward forecast targets with soft deviation guards and anomaly reporting.
• Added temperature restore toward forecast targets with soft deviation guards and anomaly reporting.
• Reworked cyclone and cloud ownership logic so cyclone-driven storm visuals are no longer immediately overwritten by cloud sampling.

Telemetry and Debugging

• Added new telemetry exports for atmosphere coupling, including target vs live values for:
  • Temperature
  • Pressure
  • Humidity
• Added humidity budget diagnostics and improved tracking of cloud-water interactions.
• Added anomaly markers to help diagnose pressure and temperature drift during runtime.

Compatibility

• Dynamic Trees compatibility remains optional, allowing the mod to load normally even if Dynamic Trees is not installed.(This module is a work in progress you should always disable it)

Fixes

• Fixed a telemetry export crash on JDK 17 caused by Gson reflective access to java.time.Instant.
  Explicit serialization for Instant is now used.

Notes

• This release contains no client or HUD changes.
• Build verified successfully on JDK 17.

Ongoing Work

• Forecast generation is now in a stable state.
• Current tuning work focuses on live runtime evolution, particularly temperature and humidity oscillations observed in some active regions.

Project Atmosphere

Changed

• Reworked wind handling across the mod to remove inconsistencies and ensure all systems use the same wind source and direction convention.
• Wind particles now sample wind every tick at their own position and smoothly steer toward it, producing real bending instead of straight trajectories.
• Player wind influence now uses Weather2-style steering applied after input, with a noticeable effect only above 11.1 m/s.
• Non-player living entities use a separate steering path with optional gust blending and higher drift caps.
• Wind direction vectors are now consistent across particles, entity forces, and SimpleClouds cloud drift.
• Cloud regions now apply a stable per-cloud direction bias plus slow wobble and slight speed variance to reduce apparent stacking.
• Temperature clamping now logs a debug warning with context and stack trace to track runaway sources.
• Server commands are now registered under the /pa root (for example /pa temperature and /pa spawnTornado).
• Wind-driven neighbor mixing now clamps its factors and deltas to stop runaway temperature spikes from spreading.
• Added weather snapshot and world-effects hooks, including rain-driven fire/campfire extinguish, cauldron filling, and dense-cloud sunburn suppression.
• Region fallback generation now ensures biome keys are present and regenerates any regions that contain only min/max clamp values.
• Wind steering now ramps near the threshold so low winds no longer slow the player.
• World effects skip sampling when no rain is present and no custom effects are registered, reducing tick load.
• Wind drift now applies as a directional add without reducing existing player speed.
• Player wind now uses intermittent gust impulses (no conveyor steering), with configurable thresholds and caps.
• Wind particle steering now caches region wind samples per tick to reduce client overhead.
• Client cloud culling now uses a single pass per tick to avoid quadratic scans.
• Creative/spectator players are immune to wind gusts, and gust impulses no longer reduce current player speed.
• Sprinting players now ignore gusts unless winds reach extreme thresholds.
• Surface wind now comes from the low-wind layer and no longer treats gust headroom as baseline speed.
• Reduced default wind push scales and player gust caps by ~3x for gentler movement impact.
• Thermometer now syncs the client day-forecast temperature so it no longer shows the 0.5 fallback.
• Instrument readouts now use server-side values in multiplayer instead of showing default client fallbacks.
• Storm sirens now play the severe-storm sound only once per continuous storm event.

Fixed

• Fixed a wind particle crash.
• Fixed wind speed being far too low due to a unit mismatch in the wind equation (hPa vs Pa), which was suppressing the computed wind magnitude.
• Fixed a 90° wind direction offset caused by inconsistent sin/cos mapping between systems.
• Fixed wind fallback behavior and cleaned up wind selection usage to reduce edge-case inconsistencies.
• Wind forces now respect exposure, skipping entities in water or lava, under cover, or colliding horizontally.

Notes

• Storms have been observed spawning again in testing (cumulus clouds and a wall cloud), so storm generation appears to be working correctly.
• Please report any unusual wind behavior, particle issues, or storm spawning problems so I can continue monitoring and tuning.

Project Atmosphere

Added

• TFC canyons, TFC salt marshes biomes support.
• Crafting recipes for dust and sand layers.
• Wind bending for realistic particles (smoke, ash, dust, snowflakes).
• Telemetry logging for cloud history and periodic region forecast/state samples.

Changed

• Default constructor to support older versions of Forge
• Pressure/temperature limits tuned for more realistic values.
• Sunlight curve/seasonal tilt updated for stronger midday and deeper winter dimming.
• Forecast data now persists across world reloads instead of regenerating every time.
• Missing-forecast warnings now log once per biome to reduce spam.
• Storm siren behavior updated for severity 7 storm warnings and tornado proximity alerts.

Fixed

• Avoided loading client-only Aurora/Rainbows classes on servers by switching mixins to string targets.
• Prevented client-only mixins from loading on dedicated servers.
• Thermometer recipe output corrected.
• Cloud telemetry logging aligned with updated signatures.
• Fixed wind-bent particle mixin compatibility by replacing the switch expression with explicit checks.

Notes

AS ALWAYS UPDATING TO THIS VERSION REQUIRES DELETING YOUR OVERWORLD FOLDER (created by Project Atmosphere) TO AVOID ISSUES WITH THE NEW REGION SYSTEM.

• Go to your worlds folder and delete the "overworld" folder to allow the new region system to generate fresh regions.
• Note that this will reset the current forecast and could introduce desynced weather effects if the forecast isn't regenerated properly. (/temperature regenerate)