Sky Creator for Unreal Engine 4 & 5
Available on Marketplace
Current version: 1.31

Documentation will be updated and improved over time.

Requirements

Sky Creator requires Niagara to be enabled to display some Weather FX such as rain and snow.

Depending on your needs you also might want to enable “Support Sky Atmosphere Affecting Height Fog” in Project Settings > Rendering. If set to off (by default), the atmosphere won’t affect height fog and it will be colored by Fog Inscattering Color (black by default).

Installing the Plugin

Open Epic Games Launcher, head to Unreal Engine > Marketplace or Library tab and find Sky Creator.
Press “Install to Engine” button and choose the appropriate engine version for you.

Open your project the engine version of which have the plugin already installed on and head to Plugins tab. Find the Sky Creator and set it enabled by checkbox. The engine will prompt to restart itself.

Restart the editor and you will have plugin enabled and ready to work.

Updating the Plugin

When the new update is available, you’ll see an orange dot notification icon in the Unreal Engine > Library tab. Head to the engine version you’re working with and press Installed Plugins under it.

Then click the Update button.

Quickstart

After enabling the plugin go to Place Actors > Lights . Here you will find a new actor “Sky Creator” ready to be drag’n’dropped to your scene.
But before adding it make sure that you have deleted or at least disabled any other Directional Light, Skylight, Volumetric Cloud and Sky Atmosphere in your level.

Now Sky Creator is ready to use. Go to Details Panel and play with settings to your liking.

The most important thing that Sky Creator has is the Weather Preset feature.
Find the Editor Weather Preset variable and try the different weather presets that are included in the package.

Important note: If you don’t see any weather presets then find the little gear icon next to search field in the same tab and enable there Show Engine Content and Show Plugin Content.

To create your own Weather Preset, right click in the Content Browser and select
Add/Import Content > Miscellaneous > Sky Creator Weather Preset. After that select a Sky Creator actor in your scene and drag a new weather preset onto Editor Weather Preset variable, making a new weather preset active. Now open it and try to create the new weather conditions that fits to your scene if you need to.

How to use Material FX

Add MF_SC_WeatherMaterialFX material function to your materials and re-pin Base Color, Roughness and Normal connectors through it. By default, all included effects will be enabled – Wetness, Puddles, Ripples and Snow.

You may optionally enable or disable some of effects using Static Bool node and plugging it into this material function.

How to use Occlusion

Occlusion effect captures a world heightmap to calculate the occlusion on material basis at a certain radius around player camera once at a defined distance step to minimize performance impact. To use Occlusion effect with Weather Material FX, you need to enable this effect by plugging Static Bool node into the Use Occlusion slot of the MF_SC_WeatherMaterialFX material function and set it to true.

Important note: You may notice that Occlusion effect is fading after reaching capture radius. To fix this you can use the included SkyCreator_CaptureDistantOcclusion blueprint. Place it in the middle of your level, adjust the width of this capture and click Capture Heightmap. After this, Distant Occlusion effect will be used on the materials in the area outside of the outer radius of the dynamic Occlusion capture.

Distant Occlusion is enabled by plugging MF_SC_DistantOcclusion material function into the Distant Occlusion pin in MF_SC_WeatherMaterialFX material function.

How to use dynamic Time of Day or Weather

By design in Sky Creator a separate blueprint controller must be used for runtime/dynamic changes. Most of the required blueprint functions are already included such as Realtime Time of Day or Lerp Weather Settings, so you don’t really need to worry about implementing it by yourself.
In the Content Browser head to “SkyCreatorPlugin Content/Blueprints” and find SkyCreator_ControllerExample. Drag it to your scene and adjust some settings such as duration of dynamic time of day or the time interval of the dynamic change of weather.

It’s may seem pretty basic, but you can greatly expand on this depending on the needs of your project.

There are some other examples of a blueprint controllers in “SkyCreatorPlugin Content/Blueprints” which you can freely use in your scenes.

How to use Sky Creator in Sequencer

In a recent plugin versions most art directable settings of Sky Creator can be driven by the Sequencer directly.
For the more complicated stuff such as interpolating between different weather presets a separate blueprint controller must be used. Head to “SkyCreatorPlugin Content/Blueprints” and find there the SkyCreator_CinematicController – it’s an another example of a blueprint controller, but for cinematics.

Important note specifically for UE4: the checkbox Is Used With Sequencer must be enabled in Details Panel in Sky Creator settings when using it with Sequencer.

Troubleshooting

Q: There are no rain or snow particles visible.
A: In Sky Creator settings check the value of the Cutoff World Height inside both Weather FX and Material FX categories. This cuts off both types of effects by the height. This is primarily made for ocean levels etc.

Q: Path Tracing view mode is constantly flickering.
A: Enable the Pause Rain Ripples Solver checkbox located in Material FX > Ripples. This will pause the rain ripples effect, so the scene wouldn’t be invalidated by the constant updating of the solver. This might be improved in future updates.

Sky Creator Actor Settings

Here’s all settings list which is meant to be set once in editor.

General

Use Editor Time of Day	Controls Time of Day by Editor. Disable if using a separate controller to drive Time of Day.
Editor Time of Day	Time of Day in Editor.
Use Editor Weather Settings	Controls Weather Settings by Editor. Disable if using a separate controller to drive Weather Settings.
Editor Weather Type	Whether to use Editor Weather Preset or Editor Weather Settings.
Editor Weather Preset	Current Weather Preset in Editor.
Editor Weather Settings	Current Weather Settings in Editor allowing to direct variable control.
Is Used With Sequencer	Marks if the actor is used by Sequencer in runtime. This is a legacy feature specific only for UE4.
Common Parameter Collection	Common Material Parameter Collection. Essential for most of effects and settings related to materials.
Sky Sphere Radius	Sky Sphere mesh radius in kilometers.
Show Debug Variables	Show or Hide debug variables across all sub-categories of settings.

Sun & Moon Position

Sun Position Type	Sun Position Type.
Sun Position Data	Sun Position Data.
Moon Position Type	Moon Position Type.
Moon Position Data	Moon Position Data.
Simple Position
Sunrise Time	User-defined Sunrise Time.
Sunset Time	User-defined Sunset Time.
Sun Dawn Offset Time	Sets “Sun Dawn Time” depending on “Sunrise Time”.
Sun Dusk Offset Time	Sets “Sun Dusk Time” depending on “Sunset Time”.
Sun Dawn Time	Sun Dawn Time.
Sun Dusk Time	Sun Dusk Time.
Sun Elevation	Sun Elevation angle in degrees.
Sun Azimuth	Sun Azimuth angle in degrees.
Sun Min Angle At Dawn & Dusk	Minimum Sun angle below horizon at Dawn or Dusk.
Moonrise Time	User-defined Moonrise Time.
Moonset Time	User-defined Moonset Time.
Moon Elevation	Moon Elevation angle in degrees.
Moon Azimuth	Moon Azimuth angle in degrees.
Real Position
Latitude	Latitude for calculating Real Sun & Moon positioning.
Longitude	Longitude for calculating Real Sun & Moon positioning.
Time Zone	Time Zone.
Daylight Saving Time	Enables Daylight Saving Time (DST).
Year	Year.
Month	Month.
Day	Day.
Light Transition
Light Transition	Enables Light Transition feature which optimizes performance and smoothly transitions between Sun Light & Moon Light. Assumes that Sun Light is always the dominant light source and that both light sources are always affecting atmosphere.
Sun Current Elevation	Current Sun Elevation.
Transition Start Sun Angle	The angle of the Sun to start the light transition. From this angle to “Transition Middle Sun Angle” the surface lighting of the Sun linearly fades out.
Transition Middle Sun Angle	The angle to switch the transition. At this angle the Shadow casting feature is switching between Sun & Moon as they’re should not cast shadows simultaneously. From this angle to “Transition End Sun Angle” the surface lighting of the Moon linearly fades in.
Transition End Sun Angle	The angle to end the transition. From this angle to “Transition Middle Sun Angle” the surface lighting of the Moon linearly fades in.
Night Intensity Transition Start Sun Angle	The angle of the Sun to start the transition to Sky Light Night Intensity.
Night Intensity Transition End Sun Angle	The angle of the Sun to end the transition to Sky Light Night Intensity.

Atmosphere

Sky Atmosphere Mobility	Sky Atmosphere Mobility.
Transform Mode	– Planet Top at Absolute World Position places the top ground level of the atmosphere at the world origin coordinates (0,0,0) in the scene. The Sky Atmosphere is not movable when this option is selected. – Planet Top at Component Transform places the top ground level of the atmosphere relative to the component’s transform origin. Moving the transform of the Sky Atmosphere component, or one that it is a child of, moves the atmosphere within the level. – Planet Center at Component Transform places the atmosphere centered to the component’s transform origin. Moving the transform of the Sky Atmosphere component, or one that it is a child of, moves the atmosphere within the level.
Planet Radius	The planet radius (kilometers from the center to the ground level).
Atmosphere Height	Atmosphere Height defines the height of the atmosphere above the planet’s surface (in kilometers).
Aerial Pespective View Distance Scale	Makes the aerial perspective look thicker by scaling distances from view to surfaces (opaque and translucent).
Quality
Trace Sample Count Scale	Scale the atmosphere tracing sample count. Quality level scalability. The sample count is still clamped according to scalability setting to ‘r.SkyAtmosphere.SampleCountMax’ when ‘r.SkyAtmosphere.FastSkyLUT’ is 0. The sample count is still clamped according to scalability setting to ‘r.SkyAtmosphere.FastSkyLUT.SampleCountMax’ when ‘r.SkyAtmosphere.FastSkyLUT’ is 1. The sample count is still clamped for aerial perspective according to ‘r.SkyAtmosphere.AerialPerspectiveLUT.SampleCountMaxPerSlice’.
God Rays Resolution	This value controls Aerial Perspective LUT Width.

Volumetric Clouds

Bottom Altitude	The altitude at which the cloud layer starts (kilometers above the ground).
Max Height	The altitude at which the cloud layer ends (kilometers above the ground).
Tracing Start Max Distance	The maximum distance of the volumetric surface before which we will accept to start tracing (in kilometers).
Tracing Max Distance	The maximum distance that will be traced inside the cloud layer (in kilometers).
Per Sample Atmospheric Light Transmittance	Whether to apply atmosphere transmittance per sample, instead of using the light global transmittance.
Quality
Cinematic Quality	Enables cinematic quality on Volumetric Cloud Render Target. Disables any form of Volumetric Cloud Render Target optimizations.
Render Mode	Default: trace quarter resolution + reconstruct at half resolution + upsample. Quality: trace half resolution + reconstruct full res + upsample. Performance: trace at quarter resolution + reconstruct full resolution (cannot intersect with opaque meshes and forces UpsamplingMode = 2).
High Quality Aerial Perspective	Enable/disable a second pass to trace the aerial perspective per pixel on clouds instead of using the aerial perspective texture. Only usable when r.VolumetricCloud.EnableAerialPerspectiveSampling = 1 and only needed for extra quality when r.VolumetricRenderTarget = 1.
Multi Scattering Approximation Octave Count	How many octave to use for the multiple-scattering approximation. This adds some costs to the tracing. 0 means single scattering only.
Ground Contribution	Sample the shadowed lighting contribution from the ground ontro the medium (single scattering). This adds some costs to the tracing when enabled.
Ray March Volume Shadow	Disable this to use the cloud shadow map instead of secondary raymarching. This is usually enough for clouds viewed from the ground and it result in a performance boost. Shadow now have infinite length but also becomes less accurate and gray scale.
View Sample Count Scale	Scale the tracing sample count in primary views. Quality level scalability CVARs affect the maximum range. The sample count resolution is still clamped according to scalability setting to ‘r.VolumetricCloud.ViewRaySampleCountMax’.
Reflection Sample Count Scale	Scale the tracing sample count in reflection views. Quality level scalability CVARs affect the maximum range. The sample count resolution is still clamped according to scalability setting to ‘r.VolumetricCloud.ReflectionRaySampleMaxCount’.
Shadow View Sample Count Scale	Scale the shadow tracing sample count in primary views, only used with Advanced Output ray marched shadows. Quality level scalability CVARs affect the maximum range. The sample count resolution is still clamped according to scalability setting to ‘r.VolumetricCloud.Shadow.ViewRaySampleMaxCount’.
Shadow Reflection Sample Count Scale	Scale the shadow tracing sample count in reflection views, only used with Advanced Output ray marched shadows. Quality level scalability CVARs affect the maximum range. The sample count resolution is still clamped according to scalability setting to ‘r.VolumetricCloud.Shadow.ReflectionRaySampleMaxCount’.
Shadow Tracing Distance	The shadow tracing distance in kilometers, only used with Advanced Output ray marched shadows.
Cloud Map
Cloud Map Scale	Cloud Map tileable texture scale in kilometers.
Cloud Map Offset	Cloud Map tileable texture UV offset.
Coverage Variation Map Scale	Coverage Variation Map tileable texture scale in kilometers.
Cloud Noise
Noise Shape Resolution	Resolution of a Noise Shape 3D Texture. Can affect performance and memory consumption.
Noise Detail Resolution	Resolution of a Noise Detail 3D Texture. Can affect performance and memory consumption.
Noise Shape Scale	Tileable 3D Noise Shape Scale (in kilometers).
Noise Detail Scale	Tileable 3D Noise Detail Scale (in kilometers).
Turbulence
Turbulence Scale	Tileable Turbulence Scale (in kilometers).

Background Clouds

Background Clouds Contrast	Background Clouds Contrast.
Background Clouds Reflection Scale	Affects the scale of reflection injected to sky light. When set to 0, Background Clouds are not illuminating the world.

Sky Light

Sky Light Mobility	Sky Light Mobility.
Real Time Capture	When enabled, the sky will be captured and convolved to achieve dynamic diffuse and specular environment lighting. SkyAtmosphere, VolumetricCloud Components as well as sky domes with Sky materials are taken into account. Should be enabled if using dynamic time of day.
Capture Time Slice	When enabled, the real-time sky light capture and convolutions will by distributed over several frames to lower the per-frame cost.
Lower Hemisphere Is Solid Color	Whether all distant lighting from the lower hemisphere should be set to “LowerHemisphereColor. Enabling this is accurate when lighting a scene on a planet where the ground blocks the sky, however disabling it can be useful to approximate skylight bounce lighting (eg Movable light).
Atmosphere And Cloud
Cloud Ambient Occlusion	Whether the cloud should occlude sky contribution within the atmosphere (progressively fading multiple scattering out) or not.
Cloud Ambient Occlusion Extent	The world space radius of the cloud ambient occlusion map around the camera in kilometers.
Cloud Ambient Occlusion Map Resolution Scale	Scale the cloud ambient occlusion map resolution, base resolution is 512. The resolution is still clamped to ‘r.VolumetricCloud.SkyAO.MaxResolution’.
Cloud Ambient Occlusion Aperture Scale	Controls the cone aperture angle over which the sky occlusion due to volumetric clouds is evaluated. A value of 1 means take into account the entire hemisphere resulting in blurry occlusion, while a value of 0 means take into account a single up occlusion direction up resulting in sharp occlusion.

Sun Light

Sun Light Mobility	Sun Light Mobility.
Control Sun Direction	Whether to control Sun direction by Sky Creator.
Sun Constant Intensity	Whether to control Sun Intensity by a constant value or by a value from a Weather Preset.
Sun Intensity	Sun Constant Intensity.
Use Temperature	Whether to use Color temperature for sun.
Sun Disk Size	Angle subtended by light source in degrees (also known as angular diameter). Realistic value is 0.5357 which is the angle for our sun.
Atmosphere And Cloud
Constant Atmosphere Disk Color Scale	Whether to use constant Atmosphere Disk Color Scale for Sun.
Atmosphere Disk Color Scale	A color multiplied with the sun disk luminance.
Per Pixel Atmosphere Transmittance	Whether to apply atmosphere transmittance per pixel on opaque meshes, instead of using the light global transmittance.
Cloud Shadow Extent	The world space radius of the cloud shadow map around the camera in kilometers.
Cloud Shadow Map Resolution Scale	Scale the cloud shadow map resolution, base resolution is 512. The resolution is still clamped to ‘r.VolumetricCloud.ShadowMap.MaxResolution’.
Cloud Shadow Ray Sample Count Scale	Scale the shadow map tracing sample count. The sample count resolution is still clamped according to scalability setting to ‘r.VolumetricCloud.ShadowMap.RaySampleMaxCount’.

Moon Light

Moon Light Mobility	Moon Light Mobility.
Control Moon Direction	Whether to control Moon direction by Sky Creator.
Moon Constant Intensity	Whether to control Moon Intensity by a constant value or by a value from a Weather Preset.
Moon Intensity	Moon Constant Intensity.
Use Temperature	Whether to use Color temperature for Moon.
Moon Disk Size	Angle subtended by light source in degrees (also known as angular diameter). Realistic value is 0.5357 which is the angle for our sun.
Moon Rotation	Moon Disk Rotation.
Moon Phase
Moon Phase	Moon Disk Phase.
Moon Phase Light Intensity Scale	Whether to scale Moon Light Intensity of the Moon Phase.
Moon Phase Light Intensity Min Scale	Minimum Moon Light Intensity scale of the Moon Phase.
Moon Phase Light Intensity Max Scale	Maximum Moon Light Intensity scale of the Moon Phase.
Atmosphere And Cloud
Constant Atmosphere Disk Color Scale	Whether to use constant Atmosphere Disk Color Scale for Moon.
Atmosphere Disk Color Scale	A color multiplied with the moon disk luminance.
Per Pixel Atmosphere Transmittance	Whether to apply atmosphere transmittance per pixel on opaque meshes, instead of using the light global transmittance.
Cloud Shadow Extent	The world space radius of the cloud shadow map around the camera in kilometers.
Cloud Shadow Map Resolution Scale	Scale the cloud shadow map resolution, base resolution is 512. The resolution is still clamped to ‘r.VolumetricCloud.ShadowMap.MaxResolution’.
Cloud Shadow Ray Sample Count Scale	Scale the shadow map tracing sample count. The sample count resolution is still clamped according to scalability setting to ‘r.VolumetricCloud.ShadowMap.RaySampleMaxCount’.

Exponential Height Fog

Exponential Height Fog Mobility	Exponential Height Fog Mobility.
Enable Exponential Height Fog	Whether to enable Exponential Height Fog.
Volumetric Fog	Whether to enable Volumetric fog. Scalability settings control the resolution of the fog simulation.
Fog Height Offset	Fog height offset, relative to the actor position Z.
Second Fog Height Offset	Second Fog height offset, relative to the actor position Z.

Star Map

Star Map Texture	Star Map Texture
Rotation Type	Star Map Rotation Type
Additional Rotation	Star Map Additional Rotation

Occlusion

Occlusion Capture	Whether to enable realtime Occlusion Capture.
Occlusion Render Target	Occlusion Render Target.
Occlusion Capture Width	Occlusion Capture width. Half of this value is a radius.
Occlusion Capture Height	Occlusion Capture camera height.
Occlusion Capture Realtime Update	Occlusion Capture realtime update. Expensive, so use with caution.
Occlusion Capture Step Distance	Fixed distance step to update Occlusion Capture.
Occlusion Bias	Occlusion Bias works similarly as known ‘Shadow Bias’ technique in shadow mapping. Low values can cause occlusion artifacts.
Occlusion Blur Samples	Sample count of the Occlusion Blur.
Occlusion Blur Distance	Blurring distance of the Occlusion Blur.
Occlusion Mask Fade Hardness	Hardness of fading Occlusion radial mask.

Weather FX

Cutoff World Height	Cutoff World Height of the all WeatherFX.
Cutoff Softness	Cutoff Softness of the all WeatherFX.
Precipitation General
Precipitation Spawn Radius	Precipitation spawn radius around the camera.
Enable GPU Precipitation	Whether to enable GPU Precipitation feature. Requires Occlusion Capture to be enabled. This is relatively cheap to use and improves overall precipitation particle density.
Precipitation Spawn Radius GPU	GPU Precipitation spawn radius around the camera.
Precipitation Max View Distance	Max distance at where precipitation particles will be alive.
Precipitation Vertical Check Distance	Distance of vertical linetrace from particle spawn point to check against occlusion.
Precipitation Collision Channel	Collision Channel for precipitation particles to check against.
Precipitation Depth Fade Distance	Depth Fade distance for precipitation particles.
Precipitation Camera Fade Distance	Camera Fade distance for precipitation particles.
Precipitation Camera Fade Offset	Camera Fade Offset distance for precipitation particles.
Rain
Rain Spawn Rate Max (CPU)	Max number of rain particles to spawn per second. Value is multiplied by “Rain Amount” value in weather preset.
Rain Spawn Rate Max (GPU)	Max number of rain particles to spawn per second. Value is multiplied by “Rain Amount” value in weather preset.
Rain Distance Scale Factor	Scale Factor by distance for rain particles (for better visibility).
Rain Camera Motion Alignment Scale	Sets the amount of Camera Motion Alignment effect. Set 0 to turn it off.
Rain Velocity Elongation Scale	Elongation (stretching) scale based on velocity of a rain particle.
Rain Mask Hardness	Mask Hardness for rain particles. Controls how ‘soft’ they look.
Rain Splash
Rain Splash Spawn Rate Max	Max number of rain splash particles to spawn per second. Value is multiplied by “Rain Amount” value in weather preset.
Rain Splash Spawn Rate Max GPU	Max number of rain splash particles to spawn per second. Value is multiplied by “Rain Amount” value in weather preset.
Snow
Snow Spawn Rate Max (CPU)	Max number of snow particles to spawn per second. Value is multiplied by “Snow Amount” value in weather preset.
Snow Spawn Rate Max (GPU)	Max number of snow particles to spawn per second. Value is multiplied by “Snow Amount” value in weather preset.
Snow Distance Scale Factor	Scale Factor by distance for snow particles (for better visibility).
Snow Camera Motion Alignment Scale	Sets the amount of Camera Motion Alignment effect. Set 0 to turn it off.
Snow Velocity Elongation Scale	Elongation (stretching) scale based on velocity of a snow particle.
Snow Mask Hardness	Mask Hardness for snow particles. Controls how ‘soft’ they look.
Lightnings
Sample Cloud Density	Enables sampling Volumetric Clouds to find a Lightning spawn position. Currently is a bit expensive to use.
Lightning Max Samples	Number of samples to find a Lightning spawn position from Volumetric Clouds.
Spawn Inner Radius	Inner radius for a random Lightning spawn.
Spawn Outer Radius	Outer radius for a random Lightning spawn.
Random Degree In Cone Max	Random Degree In Cone Max.
Lightning Bolt Emissive Scale	Lightning Bolt Emissive Scale.
Lightning Flash Fade Update Rate	Update Rate of the Lightning Flash Fade.
Lightning Flash Emissive Scale	Lightning Flash Emissive Scale.
Lightning Flash Emissive Reflection Scale	Affects the scale of reflection injected to sky light. When set to 0, Lightning Flashes are not illuminating the world.
Lightning Flash Radius Scale	Lightning Flash Radius Scale.
Lightning Flash Fade Speed	Lightning Flash Fade Speed.
Rainbow
Rainbow Distance	Camera Fade distance for precipitation particles.
Rainbow Depth Fade Distance	Depth Fade distance for precipitation particles.

Material FX

Cutoff World Height	Cutoff World Height of the all Material FX.
Cutoff Softness	Cutoff Softness of the all Material FX.
Wetness
Wetness Slope Angle	Slope Angle for the Wetness effect.
Wetness Slope Smoothness	Slope Smoothness for the Wetness effect.
Puddles
Puddles Mask Scale	Scale of the Puddles Mask in world units.
Puddles Roughness	Roughness of the Puddles effect.
Puddles Slope Angle	Slope Angle for the Puddles effect.
Puddles Slope Smoothness	Slope Smoothness for the Puddles effect.
Ripples
Pause Rain Ripples Solver	Pause Rain Ripples Solver.
Rain Ripples Update Rate	Update Rate of the Rain Ripples Solver. Higher values increases simulation speed.
Rain Ripples Scale	Scale of the Rain Ripples in world units.
Rain Ripples Max Density	Max density of Rain Ripples when the amount equals “1”.
Wind Ripples Scale	Scale of the Wind Ripples in world units.
Snow
Snow Mask Scale	Scale of the Snow Mask in world units.
Snow Scale	Scale of the Snow Material in world units.
Snow Roughness	Roughness of the Snow Material.
Snow Sparkles Scale	Scale of the Snow Sparkles effect in world units.
Snow Sparkles Roughness	Roughness of the Snow Sparkles effect.
Snow Slope Angle	Slope Angle for the Snow effect.
Snow Slope Smoothness	Slope Smoothness for the Snow effect.

Wind

Enable Wind	Whether to enable Wind. Affects Volumetric Clouds and Weather FX particles.
Independent Wind Control	If set to true, Cloud & Weather FX Wind is controlled by either static values or by separate controller. If set to false, Cloud & Weather FX Wind will read values from Weather Presets.
Volumetric Cloud
Cloud Wind Direction	Wind direction angle of Cloud layer in degrees.
Cloud Wind Speed	Wind speed for Cloud Layer in m/s.
Cloud Noise Shape Wind Direction	Cloud Noise Shape Wind Direction.
Cloud Noise Shape Wind Speed Horizontal	Cloud Noise Shape Wind Speed Horizontal.
Cloud Noise Detail Wind Speed Vertical	Cloud Noise Detail Wind Speed Vertical.
Cloud Wind Skew Amount	Skew clouds towards Low Cloud Wind Direction. Affected by Low Cloud Wind Speed.
Weather FX
Precipitation Wind Direction	Wind direction for Precipitation in angles
Precipitation Wind Speed	Wind speed for Precipitation

Post Process

Use Exposure Settings	Whether to use built-in Exposure Settings.
Exposure Method	Luminance computation method.
Exposure Compensation Curve	Exposure compensation based on the scene EV100. Used to calibrate the final exposure differently depending on the average scene luminance. 0: no adjustment, -1:2x darker, -2:4x darker, 1:2x brighter, 2:4x brighter, …
Exposure Metering Mask	Exposure metering mask. Bright spots on the mask will have high influence on auto-exposure metering and dark spots will have low influence.
Min Brightness	Auto-Exposure minimum adaptation. Eye Adaptation is disabled if Min = Max. Auto-exposure is implemented by choosing an exposure value for which the average luminance generates a pixel brightness equal to the Constant Calibration value. The Min/Max are expressed in pixel luminance (cd/m2).
Max Brightness	Auto-Exposure maximum adaptation. Eye Adaptation is disabled if Min = Max. Auto-exposure is implemented by choosing an exposure value for which the average luminance generates a pixel brightness equal to the Constant Calibration value. The Min/Max are expressed in pixel luminance (cd/m2).
Min EV100	Auto-Exposure minimum adaptation. Eye Adaptation is disabled if Min = Max. Auto-exposure is implemented by choosing an exposure value for which the average luminance generates a pixel brightness equal to the Constant Calibration value. The Min/Max are expressed in EV100 when using ExtendDefaultLuminanceRange (see project settings).
Max EV100	Auto-Exposure maximum adaptation. Eye Adaptation is disabled if Min = Max. Auto-exposure is implemented by choosing an exposure value for which the average luminance generates a pixel brightness equal to the Constant Calibration value. The Min/Max are expressed in EV100 when using ExtendDefaultLuminanceRange (see project settings).
Speed Up	In F-stops per second, should be >0.
Speed Down	In F-stops per second, should be >0.
Low Percent	The eye adaptation will adapt to a value extracted from the luminance histogram of the scene color. The value is defined as having x percent below this brightness. Higher values give bright spots on the screen more priority but can lead to less stable results. Lower values give the medium and darker values more priority but might cause burn out of bright spots. >0, <100, good values are in the range 70 .. 80
High Percent	The eye adaptation will adapt to a value extracted from the luminance histogram of the scene color. The value is defined as having x percent below this brightness. Higher values give bright spots on the screen more priority but can lead to less stable results. Lower values give the medium and darker values more priority but might cause burn out of bright spots. >0, <100, good values are in the range 80 .. 95
Histogram Log Min	Histogram Min value. Expressed in Log2 (Luminance).
Histogram Log Max	Histogram Max value. Expressed in Log2 (Luminance).
Histogram Min EV100	Histogram Min value. Expressed in EV100 when using ExtendDefaultLuminanceRange (see project settings).
Histogram Max EV100	Histogram Max value. Expressed in EV100 when using ExtendDefaultLuminanceRange (see project settings).

Sky Creator Weather Settings

Here’s all settings list which is meant to be used by weather presets in runtime.

Atmosphere

Rayleigh
Rayleigh Scattering Scale	Rayleigh scattering coefficient scale.
Rayleigh Scattering	The Rayleigh scattering coefficients resulting from molecules in the air at an altitude of 0 kilometer.
Rayleigh Exponential Distribution	The altitude in kilometer at which Rayleigh scattering effect is reduced to 40%.
Mie
Mie Scattering Scale	Mie scattering coefficient scale.
Mie Scattering	The Mie scattering coefficients resulting from particles in the air at an altitude of 0 kilometer. As it becomes higher, light will be scattered more.
Mie Absorption Scale	Mie absorption coefficient scale.
Mie Absorption	The Mie absorption coefficients resulting from particles in the air at an altitude of 0 kilometer. As it becomes higher, light will be absorbed more.
Mie Anisotropy	A value of 0 mean light is uniformly scattered. A value closer to 1 means lights will scatter more forward, resulting in halos around light sources.
Mie Exponential Distribution	The altitude in kilometer at which Mie effects are reduced to 40%.
Absorption
Absorption Scale	Absorption coefficients for another atmosphere layer. Density increase from 0 to 1 between 10 to 25km and decreases from 1 to 0 between 25 to 40km. The default values represents ozone molecules absorption in the Earth atmosphere.
Absorption	Absorption coefficients for another atmosphere layer. Density increase from 0 to 1 between 10 to 25km and decreases from 1 to 0 between 25 to 40km. The default values represents ozone molecules absorption in the Earth atmosphere.
Art Direction
Sky Luminance Factor	Scales the luminance of pixels representing the sky, i.e. not belonging to any surface.
Ground Albedo	The ground albedo that will tint the astmophere when the sun light will bounce on it. Only taken into account when MultiScattering > 0.0
Height Fog Contribution	Scale the sky and atmosphere lights contribution to the height fog when SupportSkyAtmosphereAffectsHeightFog project setting is true.

Volumetric Cloud

Stratus Coverage	Coverage of the Stratus cloud layer.
Stratus Coverage Variation	Coverage variation of the Stratus cloud layer.
Stratus Height Variation	Height variation of the Stratus cloud layer.
Stratocumulus Coverage	Coverage of the Stratocumulus cloud layer.
Stratocumulus Coverage Variation	Coverage variation of the Stratocumulus cloud layer.
Stratocumulus Height Variation	Height variation of the Stratocumulus cloud layer.
Cumulus Coverage	Coverage of the Cumulus cloud layer.
Cumulus Coverage Variation	Coverage variation of the Cumulus cloud layer.
Cumulus Height Variation	Height variation of the Cumulus cloud layer.
Cumulonimbus Coverage	Coverage of the Cumulonimbus cloud layer.
Cumulonimbus Anvil	Anvil factor of the Cumulonimbus cloud layer.
Cumulonimbus Height Variation	Height variation of the Cumulonimbus cloud layer.
Parameters
Density Bottom	Density value of the bottom level of the Volumetric Clouds.
Density Middle	Density value of the middle level of the Volumetric Clouds.
Density Top	Density value of the top level of the Volumetric Clouds.
Lighting
Albedo	Albedo color of Volumetric Clouds.
Ground Albedo	The ground albedo used to light the cloud from below with respect to the sun light and sky atmosphere. This is only used by the cloud material when the Ground Contribution is enabled from the Quality settings of Volumetric Clouds.
Beer’s Powder Intensity	Beer’s Powder Intensity.
Beer’s Powder Depth	Beer’s Powder Depth.
Bottom Occlusion	Bottom Occlusion amount of the volumetric clouds. Affects only Cumulus and Cumulonimbus layers.
Bottom Occlusion Height	Normalized height of the Bottom Occlusion.
Night Emissive	Emissive color of Volumetric Clouds. Better to keep this value low.
Phase G	Phase function describing how much forward (G < 0) of backward (G > 0) light scatter around.
Phase G2	Second phase function describing how much forward (G < 0) of backward (G > 0) light scatter around.
Phase Blend	Lerp factor when blending the two phase functions.
Multi Scattering Contribution	Multi-scattering approximation: represents how much contribution each successive octave will add. Evaluatead per pixel.
Multi Scattering Occlusion	Multi-scattering approximation: represents how much occlussion will be reduced for each successive octave. Evaluatead per pixel.
Multi Scattering Eccentricity	Multi-scattering approximation: represents how much the phase will become isotropic for each successive octave. Evaluatead per pixel.
Noise
Noise Shape Intensity A	Noise Shape Intensity A.
Noise Shape Intensity B	Noise Shape Intensity B.
Noise Shape Intensity C	Noise Shape Intensity C
Noise Shape Intensity D	Noise Shape Intensity D

Background Clouds

Intensity	Overall intensity of Background Clouds.
Color Tint	Color Tint of Background Clouds.
Layer A	Amount of ‘Layer A’ in Background Clouds.
Layer B	Amount of ‘Layer B’ in Background Clouds
Layer C	Amount of ‘Layer C’ in Background Clouds
Lightning Phase	Amount of Lightning Phase in Background Clouds.

Sky Light

Intensity	Total energy that the light emits.
Night Intensity	Energy that the light emits in the nights.
Light Color	Filter color of the light. Note that this can change the light’s effective intensity.
Lower Hemisphere Color	Lower Hemisphere Color.
Cloud Ambient Occlusion Strength	The strength of the ambient occlusion, higher value will block more light.

Sun Light

Intensity	Maximum illumination from the light in lux.
Light Color	Filter color of the light. Note that this can change the light’s effective intensity.
Temperature	Color temperature in Kelvin of the blackbody illuminant. White (D65) is 6500K.
Volumetric Scattering Intensity	Intensity of the volumetric scattering from sun. This scales Intensity and Light Color.
Atmosphere And Cloud
Atmosphere Disk Color Scale	A color multiplied with the sun disk luminance.
Cloud Scattered Luminance Scale	Scales the lights contribution when scattered in cloud participating media.
Cloud Shadow Strength	The overall strength of the cloud shadow, higher value will block more light.
Cloud Shadow on Atmosphere Strength	The strength of the shadow on atmosphere. Disabled when 0.
Cloud Shadow on Surface Strength	The strength of the shadow on opaque and transparent meshes. Disabled when 0.

Moon Light

Intensity	Maximum illumination from the light in lux.
Light Color	Filter color of the light. Note that this can change the light’s effective intensity.
Temperature	Color temperature in Kelvin of the blackbody illuminant. White (D65) is 6500K.
Volumetric Scattering Intensity	Intensity of the volumetric scattering from moon. This scales Intensity and Light Color.
Atmosphere And Cloud
Atmosphere Disk Color Scale	A color multiplied with the moon disk luminance.
Cloud Scattered Luminance Scale	Scales the lights contribution when scattered in cloud participating media.
Cloud Shadow Strength	The overall strength of the cloud shadow, higher value will block more light.
Cloud Shadow on Atmosphere Strength	The strength of the shadow on atmosphere. Disabled when 0.
Cloud Shadow on Surface Strength	The strength of the shadow on opaque and transparent meshes. Disabled when 0.

Height Fog

Fog
Fog Density	Global density factor of fog.
Fog Height Falloff	Height density factor, controls how the density increases as height decreases. Smaller values make the visible transition larger.
Fog Inscattering Color	Fog Inscattering Color.
Fog Start Distance	Distance from the camera that the fog will start.
Second Fog
Second Fog Density	Global density factor of secondary fog.
Second Fog Height Falloff	Height density factor, controls how the density increases as height decreases. Smaller values make the visible transition larger.
Directional Inscattering
Directional Inscattering Exponent	Controls the size of the directional inscattering cone, which is used to approximate inscattering from a directional light. Note: there must be a directional light with bUsedAsAtmosphereSunLight enabled for DirectionalInscattering to be used.
Directional Inscattering Start Distance	Controls the start distance from the viewer of the directional inscattering, which is used to approximate inscattering from a directional light. Note: there must be a directional light with bUsedAsAtmosphereSunLight enabled for DirectionalInscattering to be used.
Directional Inscattering Color	Controls the color of the directional inscattering, which is used to approximate inscattering from a directional light. Note: there must be a directional light with bUsedAsAtmosphereSunLight enabled for DirectionalInscattering to be used.
Volumetric Fog
Volumetric Fog Scattering Distribution	Controls the scattering phase function – how much incoming light scatters in various directions. A distribution value of 0 scatters equally in all directions, while .9 scatters predominantly in the light direction. In order to have visible volumetric fog light shafts from the side, the distribution will need to be closer to 0.
Volumetric Fog Albedo	The height fog particle reflectiveness used by volumetric fog. Water particles in air have an albedo near white, while dust has slightly darker value.
Volumetric Fog Emissive	Light emitted by height fog. This is a density so more light is emitted the further you are looking through the fog. In most cases skylight is a better choice, however right now volumetric fog does not support precomputed lighting, so stationary skylights are unshadowed and static skylights don’t affect volumetric fog at all.
Volumetric Fog Extinction Scale	Scales the height fog particle extinction amount used by volumetric fog. Values larger than 1 cause fog particles everywhere absorb more light.

Star Map

Star Map Brightness	Overall brightness of the Star Map.
Star Map Color Tint	Overall color tint of the Star Map.
Star Map Twinkle Intensity	Intensity of twinkling stars.
Star Map Twinkle Saturation	Saturation of twinkling stars.
Star Map Twinkle Speed	Twinkle speed of stars.
Star Map Horizon Threshold	Indicates how strong the star map can be faded into horizon. Lower values cause more stars appear at horizon.
Star Map Atmosphere Threshold	Indicates how strong the star map can be faded into atmosphere. Lower values cause more stars appear at brighter points in atmosphere, e.g. at daytime.
Night Horizon Color	Color tint of the horizon.
Night Zenith Color	Color tint of the zenith.

Weather FX

Rain
Rain Amount	Rain Amount.
Rain Color	Rain Color.
Rain Gravity	Gravity of a biggest sized raindrop.
Rain Lifetime Min	Minimum lifetime of a single raindrop. Can affect the performance.
Rain Lifetime Max	Maximum lifetime of a single raindrop. Can affect the performance.
Rain Size Min	Minimum size of a single raindrop.
Rain Size Max	Maximum size of a single raindrop.
Rain Splash
Rain Splash Lifetime Min	Minimum lifetime of a single rain splash. Can affect the performance.
Rain Splash Lifetime Max	Maximum lifetime of a single rain splash. Can affect the performance.
Rain Splash Size Min	Minimum size of a rain splash.
Rain Splash Size Max	Maximum size of a rain splash.
Snow
Snow Amount	Snow Amount.
Snow Color	Snow Color.
Snow Gravity	Gravity of a biggest sized snowflake.
Snow Turbulence	Snow turbulence.
Snow Lifetime Min	Minimum lifetime of a single snowflake. Can affect the performance.
Snow Lifetime Max	Maximum lifetime of a single snowflake. Can affect the performance.
Snow Size Min	Minimum size of a single snowflake.
Snow Size Max	Maximum size of a single snowflake.
Lightnings
Enable Lightnings	Whether to enable Lightnings.
Lightning Spawn Interval Min	Minimum interval to randomly spawn Lightning in seconds.
Lightning Spawn Interval Max	Maximum interval to randomly spawn Lightning in seconds.
Lightning Color Min	Minimum Lightning color.
Lightning Color Max	Maximum Lightning color.
Lightning Lifetime	Lightning lifetime in seconds.
Lightning Bolt
Lightning Bolt Spawn Chance	Chance of spawning a Lightning Bolt when spawning a Lightning.
Lightning Bolt Width Min	Minimum width of a Lightning Bolt.
Lightning Bolt Width Max	Maximum width of a Lightning Bolt.
Lightning Bolt Length Min	Minimum length of a Lightning Bolt (in kilometers).
Lightning Bolt Length Max	Maximum length of a Lightning Bolt (in kilometers).
Lightning Bolt Curve Frequency	Frequency of a Lightning Bolt curvature.
Lightning Bolt Curve Strength Min	Minimum strength of a Lightning Bolt curvature.
Lightning Bolt Curve Strength Max	Maximum strength of a Lightning Bolt curvature.
Lightning Bolt Jitter Strength	Jitter strength of a Lightning Bolt.
Lightning Branches
Lightning Branch Spawn Chance	Chance of spawning a Lightning Branch when spawning a Lightning Bolt.
Lightning Branch Scale Min	Minimum scale of a Lightning Branch.
Lightning Branch Scale Max	Maximum scale of a Lightning Branch.
Rainbow
Rainbow Amount	Rainbow Amount.
Rainbow Color	Rainbow Tint Color.
Rainbow Radius	Radius of the Rainbow.
Rainbow Thickness	Thickness of the Rainbow.
Secondary Rainbow Color	Secondary Rainbow Tint Color.
Secondary Rainbow Radius	Radius of the Secondary Rainbow.
Secondary Rainbow Thickness	Thickness of the Secondary Rainbow.

Material FX

Wetness
Wetness Amount	Wetness Amount.
Wetness Color	Wetness Color.
Puddles
Puddles Amount	Puddles Amount.
Puddles Color	Puddles Color.
Ripples
Rain Ripples Amount	Rain Ripples Amount.
Rain Ripples Intensity	Rain Ripples normap map intensity.
Rain Ripples Force Min Radius	Min Force Radius to write by the Rain Ripples Solver.
Rain Ripples Force Max Radius	Max Force Radius to write by the Rain Ripples Solver.
Rain Ripples Rings Number	Number of Rain Ripples Rings to propagate by a single raindrop.
Rain Ripples Rings Delay	Delay of Rain Ripples Rings propagation. Number represents Rain Ripples Solver frames to skip.
Rain Ripples Damping	Damping of Rain Ripples. Higher values are fading Rain Ripples faster.
Wind Ripples Intensity	Wind Ripples normap map intensity.
Wind Ripples Speed	Speed of the Wind Ripples.
Snow
Snow Amount	Snow Coverage Amount.
Snow Color	Snow Coverage Color.
Snow Intensity	Snow normap map intensity.
Snow Sparkles Threshold	Snow Sparkles Threshold. Lower values exposes more sparkles.

Wind

Volumetric Cloud
Cloud Wind Direction	Wind direction angle of Low Cloud layer in degrees.
Cloud Wind Speed	Wind speed of Low Cloud layer in m/s.
Cloud Noise Shape Wind Direction	Wind direction angle of Cloud Noise in degrees.
Cloud Noise Shape Wind Speed Horizontal	Horizontal wind speed of Cloud Noise Shape in m/s.
Cloud Noise Detail Wind Speed Vertical	Vertical wind speed of Cloud Noise Detail in m/s.
Weather FX
Precipitation Wind Direction	Wind direction angle of precipitation particles in degrees.
Precipitation Wind Speed	Wind speed of precipitation particles.

Post Process

Bloom Intensity	Multiplier for all bloom contributions >=0: off, 1(default), >1 brighter.
Bloom Threshold	Minimum brightness the bloom starts having effect. -1: all pixels affect bloom equally (physically correct, faster as a threshold pass is omitted), 0: all pixels affect bloom brights more, 1 (default), > 1 brighter
Exposure Compensation	Logarithmic adjustment for the exposure. Only used if a tonemapper is specified. 0: no adjustment, -1:2x darker, -2:4x darker, 1:2x brighter, 2:4x brighter, …

To be updated.

Supported Plugin Versions

Here’s a table of latest supported Plugin version for each Engine Version.

Engine Version	4.26	4.27	5.0	5.1
Latest supported Plugin version	1.30	1.31	1.31	1.31

Changelog

V1.00

• Initial release

V1.01

• Deleted two legacy unused functions which were triggering an error “Explicit Category is required …” when packaging a build
• Moved Rain & Snow particle emitters from GPU to CPU, which fixes an error “Assertion failed: OnRequestDefaultDataInterface.IsBound() …”. This is probably an engine bug, deserves a further investigation. This can be just a temporary solution for now
• Default values to Rain & Snow particle count are reduced because CPU emitters are usually more expensive
• Fixed wrong material link in static mesh “SM_SC_SkySphere”
• Moved “Volumetric Cloud MID” variable in “Debug” Category
• Reverted to false default “Per Pixel Atmosphere Transmittance” boolean values to Sun and Moon (can cause “shadow zones” if surface is below Planet Top of Sky Atmosphere)

V1.02

• Fixed Moon disk direction when Sky Creator actor is rotated
• Fixed visual bug with long Cloud Wind Skew when editing clouds in editor
• Fixed Second Fog control in Exponential Height Fog
• Lowered default value for Cloud Shadow Extent from 50 to 25 in Sun & Moon (better cloud shadows with same performance)

V1.03

• Changed Volumetric Cloud material shading model to “Default Lit” instead of “Unlit” (makes no difference in UE4 4.26, but it does in UE5)
• Added engine major version verification when initializing FPlaceableItem in editor module (that struct is a bit different between UE4 and UE5)

V1.04

• Fixed Moon Disk sorting priority in sky material – stars are properly occluded now
• Fixed Moon Mask aliasing
• Fixed “Auto Scale” for Volumetric Cloud Noise
• Fixed “Cloud Wind Skew”
• Added “SkyCreator_CinematicController” blueprint specifically for Sequencer
• Added Moon Disk Rotation
• Added ability to choose between “Editor Weather Preset” and “Editor Weather Settings” – second option is for direct variable control
• Added two new quality options for Volumetric Cloud – “Ground Contribution” and “Multi Scattering Approximation Octave Count”
• Renamed “Sample Count Scale” subcategory to “Quality” in Volumetric Cloud options
• Renamed “Sync With Low Cloud Map Scale” variable to “Auto Scale” in Volumetric Cloud options

V1.05

• Fixed “Explicit Category is required …” in a Volumetric Cloud Materials struct when packaging a build

V1.10

• Enhanced Rain & Snow including many improvements
• New Rain Splashes effect
• Expanded Exposure settings supporting “Extended Luminance Range”
• Lower Hemisphere Color for Sky Light (useful for night lighting)
• Sun Light Intensity in Weather Settings is now “40.0”
• Moon Light Intensity in Weather Settings is now “0.02”
• Min Brightness for Exposure is now “0.02”
• Speed Up and Speed Down for Exposure are now “4.0”
• Fixed a typo in “Bottom Altitude” variable

V1.11

• New Cloud settings for Sun Light & Moon Light
• New Star Map Threshold settings
• New Star Map Twinkle settings
• Added “Use Editor Time of Day” & “Use Editor Weather Settings”
• Commented all visible variables
• Unclamped variables where it was unnecessary
• Added missing line “Super::GetLifetimeReplicatedProps(OutLifetimeProps)” to the replication function

V1.12

• Displaying debug variables now can be turned off by a checkbox “Show Debug Variables”
• Changed default “Fog Inscattering Color” from black to dark blue color (improves lighting at nights)
• Modified ConstructorStatics calls in SkyCreatorActor.cpp
• Added missing “Lower Hemisphere Color” parameter in the “Lerp Sky Light Settings” function
• Fixed empty reference in “MI_SC_SkySphere”
• Fixed empty reference in “MI_Demo_01”
• Fixed “ObjectProperty is not initialized properly” warnings
• Fixed casting static shadows from Compass mesh

V1.20

• Added dynamic Occlusion Capture
• Added new Weather Material FX – Wetness
• Added new Weather Material FX – Puddles
• Added new Weather Material FX – Ripples (including built-in Ripples Solver)
• Added new Weather Material FX – Snow
• Added new blueprint “SkyCreator_CaptureDistantOcclusion”
• Added new blueprint “SkyCreator_DebugOcclusion”
• Debug category is now deprecated – now all debug variables are placed at corresponding categories. They are still not visible by default, but can be turned on by “Show Debug Variables” checkbox
• Updated “SkyCreator_ControllerExample” – now it has Accumulation/Dry timers for the new Weather Material FX
• Updated Demo map
• Updated default Weather Settings to be slightly more pleasing to the eye
• Updated all Weather Presets and added a few more
• Updated Rain material to be slightly more soft looking

V1.21

• Added Real Sun & Moon Positioning
• Moved all Sun & Moon position settings into new single category “Sun & Moon Position”
• Reworked “Light Transition” hardcoded feature. Transitions between Sun & Moon are noticeably smoother now
• Direction of the North has changed from Y- to X+ to match Unreal’s yaw angle rotation
• Disabled Cloud Shadows of MoonLight component by default
• Fixed wrong color conversion with Volumetric Fog Albedo in Weather Settings
• Minor changes to code to have UE 5.0 Preview compatibility

V1.22

• Added Camera Velocity Alignment effect for Rain FX
• Added Moon Phase Light Intensity Scale
• Moon Disk color (or “Atmosphere Disk Color Scale”) is now independent of Moon Intensity and Moon Light Color
• Precipitation FX is now rendered before DOF
• Increased default Rain Splash amount x2
• Fixed crash when trying to change Sun or Moon Position Type variable of a blueprint child of Sky Creator
• Fixed Rain Splash fading

V1.23

• Added GPU Precipitation Particles feature
• Added Motion-based Alignment & Elongation for Precipitation particles
• Added Unified Gravity settings for Precipitation particles
• Added Constant Sun & Moon Intensity
• Redesigned Rain, Rain Splash and Snow materials (better blending with a scene and better visibility)
• Deleted “Distant Precipitation” feature (replaced by GPU Precipitation)
• Deleted “Index of Refraction” settings
• Deleted “Rain Length Min” and “Rain Length Max” variables are obsolete now
• Replaced “Gravity Min” and “Gravity Max” with a single “Gravity” variable
• Renamed “Camera Velocity Alignment” to “Camera Motion Alignment”
• Changed “Snow Spawn Rate Max” default value to 1000
• Changed some minor default weather preset settings
• Declared some functions as virtual
• Fixed Occlusion Capture not happening at the level load
• Fixed “Niagara Shader Module Delegate Never Set” crash in packaged builds

V1.30

• Added the new Multi-Layered Volumetric Cloud Material. Includes new cloud layers such as – Stratus, Stratocumulus, Cumulus and Cumulonimbus. The new “Coverage Variation” setting can break up cloud coverage in the sky per cloud layer.
• Added a new Weather FX – Lightnings. They supports lightning flashes inside the clouds and they can sample the cloud density to be able to spawn only inside the cloud. Also very customizable in weather presets.
• Added the new Background Clouds
• Added more Quality settings for Volumetric Clouds
• Added the new Night Intensity variable for Sky Light (adjustable in Weather Presets)
• Added Atmosphere and Cloud settings for Sun & Moon (adjustable in Weather Presets)
• Added Ground Albedo for Atmosphere (adjustable in Weather Presets)
• Added Ground Albedo for Volumetric Clouds (adjustable in Weather Presets)
• Added a new Blueprint function “Get Cloud Density At Position”
• Added a few more Weather Presets, such as Storm types and a Dark Fantasy types
• Renamed “Sky Atmosphere” to “Atmosphere”
• Renamed “Weather Material FX” to “Material FX”
• Renamed “Sky Creator Parameter Collection” to “Common Parameter Collection”
• Renamed all “Low Cloud …” type of variables to “Cloud …” (due to new Volumetric Cloud material)
• Renamed “Angular Diameter” to “Disk Size” for Sun & Moon
• Renamed Exposure to Post Process
• Replaced lots of variables in “Volumetric Clouds” categories in weather settings/presets and actor. This will reset to default values most of the custom cloud settings unfortunately
• Removed all “High Cloud” variables (due to new Volumetric Cloud material). These are fully replaced by the new “Background Clouds” feature
• Removed “Auto Scale” bool
• Changed variables in Volumetric Cloud materials to be controlled by MPC instead of MID
• Changed 2D & 3D textures related to Volumetric Cloud materials
• Changed the way Sun & Moon are fading in transition
• Changed the way tick functions are executed – from custom timers to Timer Handles
• Changed Built-in Exposure settings to be much less aggressive
• Changed code base to be more clean
• Fixed wrong Longitude variable clamping for Real Positioning
• Fixed excessively big Bounds Scale of WeatherFX component
• Fixed “Star Twikle” effect capturing by the Sky Light
• Fixed Volumetric Fog flickering behaviour
• Fixed performance slowdowns in editor when in was in background
• Fixed Cloud Wind working even if the Editor is working in background
• Fixed Rain Ripples freezing when disabling Rain Ripples Solver, now it just clears away
• Fixed “Moon Phase Light Intensity Scale” not depending on the “Moon Constant Intensity”
• Fixed the Occlusion Capture capturing volumetric clouds which led to performance issues when flying inside the clouds
• Fixed some components not updating in realtime in certain conditions
• Fixed absence for a valid check for a weather preset (which could let to a error when packaging)
• Hotfix: Fixed wrong shader directory detection
• Hotfix: Stars becoming invisible in PIE
• Hotfix: Added missing parameter “Coverage Variation Map Scale”
• Hotfix: Added missing parameters inside the “Lerp Weather FX function”
• Hotfix: Fixed wrong bits when “Light Transition” was off

V1.31

• Added advanced Sequencer support: most of art-directed settings of Sky Creator now can be controlled directly in Sequencer
• Added a new Weather FX – Rainbows
• Added Cutoff for Weather FX & Material FX
• Added Color Tint for Background Clouds (Weather Settings)
• Added new blueprint functions: Set Sun Simple Position Settings, Set Moon Simple Position Settings, Set Real Position Settings
• Added new variable “Pause Rain Ripples Solver” located in Material FX > Ripples. Can be useful when viewing the scene with Path Tracing, so the solver couldn’t invalidate the scene by constant updating (should be checked manually when using Path Tracing!)
• Fixed Path Tracing being updated each frame with Sky Creator on a scene
• Fixed typo in “EVolumetricCloudNoiseDetailResolution” variable
• Fixed the absence of “const” in functions and variables where it was needed
• Hotfix: Fixed the Skylight recapturing when it is not set to realtime
• Hotfix: Added new variable “Is Used by Sequencer” which lets the actor to update in runtime by Sequencer (UE4 only)
• Hotfix: Fixed the cloud wind working only on dedicated servers
• Hotfix: Fixed the Moon Direction in the sky material
• Hotfix: Fixed the “Forward Shading Priority” variable change by Sunlight and Moonlight (introduced in UE 5.1)
• Hotfix: Lowered down the default values of “Shadow View Sample Count Scale” and “Shadow Reflection Sample Count Scale” (the way it rendered has changed in UE5)