xEnviro

### [1.20] April 21st 2023
### Added
- New architecture to accommodate procedural changes.

### Changed
- Sound processor temporary disabled.
- Visual effects temporary disabled.
- Cloud shader revision.
- Shaders moved to HDR rendering.
- More accurate light phase with glory and fogbow.
- Default X-Plane precipitation temporary enabled.
- Aerodrome surface set using X-Plane runway condition.
- UI colors changed to match X-Plane palette.

### Removed
- Sounds settings.
- Realistic aerial perspective.
- Realistic night perspective.
- Control water waves.
- Draw wet aerodrome surface.
- Draw drifting snow.
- Draw snow in mountains.
- Seasonal changes.
- Windshield effects.
- Volumetric aircraft lights effect.
- Lens flares.
- Diffraction spikes.
- Glorious sun.
- Custom rain.
- Custom snow.
- City lights.



### [1.19]
### Added
- None.

### Changed
- Shader code revision.

### Removed
- None.



### [1.18]
### Added
- Historical weather.
- Historical Weather main menu entry.
- Historical Weather window.
- Historical Weather checkbox.
- Historical weather Month slider.
- Historical weather Day slider.
- Historical weather Time UTC slider.
- About window Deactivate button.

### Changed
- Sky misalignment for OpenGL rendering fixed.

### Removed
- None.

Version 1.16 (January 4th 2020)

### Changed
- Scenery lights now appear gradually when breaking out from clouds.

### Fixed
- Vulkan projection matrix bug.

Version 1.15 (December 24th 2020)

### [Known issues]
- Precipitation follows camera
- Snow coverage may appear in the regions where no snowfall encountered recently
- Default X-Plane night triggers lights artifacts
- Cloud edge artifacts
- Low level clouds may be combined



### [1.15]
### Added
- Vulkan Compatible
- Realistic ozone level checkbox.
- Post processing tone mapping added.
- Tone mapping selector slider.

- Tone mapping mixing level slider.
- Vulkan rendering support.
- Light scattering from scenery light sources at night.
- Button or key assignable command to show and hide Settings window.
- Windshield fogging effect.
- Windshield freezing effect.

### Changed
- X-Plane precipitation dataref update suspended for critical phases of flight.
- Rain and snow effect improved.

### Removed
- Maximum ozone level slider.

### Fixed
- Scenery light no more disappear abruptly at night.

Version 1.14 (November 21st 2020)

### [Known issues]
- Precipitation follows camera
- Snow coverage may appear in the regions where no snowfall encountered recently
- Default X-Plane night triggers lights artifacts
- Cloud edge artifacts
- Low level clouds may be combined



### [1.14]
### Added
- Local area airborne visibility.
- Realistic aerial perspective checkbox added.
- Realistic night perspective checkbox added.
- High and medium altitude clouds based on forecast data.
- Clouds static quality slider added.
- Clouds dynamic quality slider added.
- Clouds detail range slider added.
- Clouds blur level slider added.
- Weather search tab.
- Draw drifting snow checkbox added.
- Button or key assignable command to force CAVOK condition.
- Button or key assignable command to show and hide Weather Briefing window.
- Surface snow drift effect.

### Changed
- Illumination and shadows adjusted for low level sun angles.
- Atmosphere and haze constants adjusted to better match reported conditions.
- Heavy and slow atmosphere perspective model replaced with simple and fast calculations.
- Light phase displacement coefficients revised for water droplets and aerosols.
- Light phase displacement coefficients revised for solid particles and pollution.
- Early discard pass implemented for better performance.
- Two stage drawing pass implemented for better performance.
- Filter pass implemented for better performance and appearance.
- Noise mixing law for base shapes.
- Scattering and illumination model adjusted.
- Sector drawing logic changed to remove grid lines.
- Haze blending for clouds has been adjusted.
- Turbulence model adjusted to accurately model disturbances for high lifting index areas.
- Turbulence model adjusted to accurately model disturbances inside clouds.
- Turbulence model adjusted to better model long term forces.
- X-Plane shadow logic adjusted for low sun angles.
- Precipitation model adjusted to calculate the amount of precipitation inside the clouds.
- Precipitation model adjusted to calculate the amount of precipitation falling out of the clouds.
- Wet and damp surface logic adjusted.

### Removed
- Full clouds coverage checkbox removed.

### Fixed
- Squared sectors of clouds.
- Runway lights range in low visibility conditions.

Version 1.13 (November 11th 2019)

### Changed
- Atmosphere and haze constants adjusted to better match reported conditions.

Version 1.12 (October 28th 2019)

### Added
- Aircraft lights now illuminate clouds.
- Full clouds coverage checkbox.
- Seasons.
- Seasonal changes intensity slider.

### Changed
- Scattering equations for low sun angles.
- Better sector mixing to reduce squared appearance.
- Noise mixing law for base shapes.
- Noise mixing law for cirrus clouds.
- Noise mixing law for stratus clouds.
- Scenery light visibility law adjusted.
- Control water waves now controls water textures too.
- Wet aerodrome surface checkbox affects particles exhaust effect too. 
- Snow application logic changed to remove yellow tint from the default X-Plane sun.
- Rendering Settings renamed to Environment Settings.
- Environment settings presets changed to Simple and Realistic.

### Removed
- Maximum intensity slider for clouds.
- Maximum snow coverage slider.

### Added
- Brightness slider.
- Contrast slider.
- Vibrance slider.
- Gamma slider.
- Button to close the Briefing window.
- Control water waves checkbox.

### Changed
- Noise mixing law for cumulus clouds.
- Noise mixing law for cumulonimbus clouds.
- Coverage procedures adjusted to match new cloud laws.
- Basic volume sampling optimization.
- Cloud Settings changed to Rendering Settings.
- Simple preset changed to Natural.
- Full preset changed to Vivid.
- Settings window controls and elements positions.

### Removed
- In cloud effect checkbox.

### Added
- Maximum ozone level slider.
- Volume rendered clouds.
- Maximum intensity slider.
- Blur level slider.
- Reduce surface crosswind checkbox added.
- New alternative sun glare.
- Checkbox to display or remove diffraction spikes.
- Camera blue filter slider.
- Draw default night sky checkbox.
- Parameters for water waves adjusted to match current weather.
- Dynamic snow coverage in the mountain areas.
- Dynamic surface snow coverage.
- Dark airport surface when wet.
- Maximum snow coverage slider.
- Wet aerodrome surface effect checkbox.
- Draw snow in mountains checkbox.
- Volume shadows for haze.
- Automatic server selection based on response time.

### Changed
- Calculations for scattering, perspective and optical depth have been separated. 
- The entire scene lighting is now calculated dynamically for the key points.
- Scenery albedo now dynamically adjusted for a better environment representation. 
- Low level haze scattering calculation allows variable particle size.
- Turbulence slider now controls the average amount of flow disturbance.
- ALOFT data format has been changed, sampling rate increased, vorticity data added.
- Airport lights range has been adjusted to match the actual visibility range.
- New rain effect.
- New snow effect.
- Rain and snow affected by aircraft lights.
- Volumetric landing and taxi light beams.
- Default surface drifting snow removed at runtime.
- Separate windshield effects for rain and snow conditions.
- Windshield effect now displays reflective raindrops.
- Combined atmosphere shader adjusted to hide the DSF edge.
- Database update has been moved to the separate thread.

### Removed
- Resolution slider has been removed.
- Complexity slider has been removed.
- Reflections range slider has been removed.
- Detailed range slider has been removed.
- Maximum drawing distance slider removed.
- Post processing checkbox removed.
- Remove scenery shadows under overcast checkbox removed.
- Billboard clouds have been completely removed.
- Crepuscular rays temporary removed.
- Draw crepuscular rays checkbox has been removed.
- Camera shift slider removed.

### Fixed
- Assymetric projection matrix applied to the cockpit camera.
- Camera zoom is now correct.
- Early low resolution depth test has been removed to allow full resolution depth test.
- Aircraft is no more in the shadow above the cloud layer.

### [Known issues]
- Precipitation follows camera
- Unnatural cloud formations at high levels or squared sectors of clouds
- Snow coverage may appear in the regions where no snowfall encountered recently
- Default X-Plane night triggers lights artifacts