Introduction

All features of EasySky are documented here. Feel free to join Discord if you have any questions or feature requests. You can also Email us at Perfect_StormTD( @ ) hotmail.com.

Cycle Speed

The Cycle Speed determines the speed of the Day Night Cycle. By default, this is set to 3 minutes, meaning it will take 3 minutes to do a 24 hours cycle.
Users can change this to one of these settings:

  • 1 second
  • 10 seconds
  • 30 seconds
  • 1 minute
  • 3 minutes
  • 5 minutes
  • 10 minutes
  • 30 minutes
  • 1 hour
  • 3 hours
  • 6 hours
  • 12 hours
  • 24 hours (Real Time)

Users have the option to exclude the clouds from the cycle speed up, by un-checking the Speed up Clouds checkbox.

Dynamic Clouds

The Dynamic Clouds have lots of settings that can be tweaked. Here is a list of settings that will change the clouds:

  • Clouds Fill
    • This parameter will increase or decrease the amount of clouds. The parameter can be called by other blueprints and changed at run-time. Please note that in this version, editing it at run-time will not work in multiplayer.

  • Far Clouds Fill
    • Just like Clouds Fill, this will increase or decrease the amount of distance clouds. These clouds are barely visible, but add a lot of depth to the sky.

  • Cloud Height (Advanced)
    • The height of the cloud layer.

  • Use Multiple Cloud Layers (Advanced)
    • The user can disable the Far Clouds to save an extra texture lookup and gain some performance, by un-checking this checkbox.

Sky Size

  • This is useful to scale the skybox if desired. Users can choose from a couple of settings:
    • Extra Small
    • Small
    • Medium
    • Large
    • Extra Large
    • Custom
  • If the user chooses the Custom setting, they can use the Custom Sky Size parameter to set the desired scale.

Northern Latitude

  • This property lets you tweak the Northern Latitude. This controls how the sun will progress over the level. A latitude of 0 means that at 12 o’clock, the sun will right above the level. A latitude of 90 or -90 means it will be on the horizon. Please keep in mind that the tilting of the earth is not taken into consideration, so it will always travel the same path.
    • The calculation is an approximation of the Northern Latitude. It should not be used to do lighting visualizations for shadow models, but pure as a cosmetic feature!

Sun Start Time

  • Controls the time on level start in hours. For example: 13 means 1 o’clock PM (13.00 hr), 1 means 1 o’clock AM (01:00 hr).

Sky Light

The sky light controls the ambient lighting in the scene. The directional lights of the sun and moon control the main lighting, but the sky light is important, because it removes black shadows in the scene.
The plugin uses 2 cubemaps. One daytime and one nighttime cubemap. It will blend between them during the transition from day to night or the other way around. The cubemaps are pre-rendered, to make sure that there is no performance drop when entering night time or day time again.
There are several parameters that can influence the ambient lighting of the SkyLight:

  • SkyLight Intensity
    • Controls the general intensity of the SkyLight

  • MinMax SkyLight Intensity
    • Min is a multiplier of the SkyLight Intensity during Night time
      • This could brighten or darken the ambient lighting during Night.
    • Max is a multiplier of the SkyLight Intensity during day time
      • This could brighten or darken the ambient lighting during the day.

Moon

The moon plays a big part during the night. It creates lighting from its directional light, but also has a realistic moon phase.
At the moment, it’s not possible to change the moon texture through blueprint. This will be added in a later update, but can easily be achieved by replacing the moon texture by something else. Keep in mind that the moon uses a diffuse and normal map texture.
The parameters that control the moon are as follows:

  • Moon Size
    • Controls the size of the moon.

  • Moon Flare Intensity
    • The opacity of the glow around the moon.

Sun

The sun can be tweaked by the following settings:

  • Sun Texture
    • The texture of the sun.
  • Sun Texture Opacity
    • The opacity of the sun.

  • Sun Scale
    • Controls the scale of the sun.

Wind

Wind is used for the clouds. It controls the speed and direction of the clouds. The direction and speed are set at initialization, and at this moment, they can’t be changed during run-time.

  • Wind Rotation
    • Controls the wind direction.
  • Wind Strength
    • Controls the wind strength.

Lighting

EasySky uses 2 Directional Lights. One for the sun and one for the moon. Both Directional Lights are always active. This will be updated in a later patch to disable Directional lights that have an intensity of 0, to gain some performance when only 1 Directional Light is visible.
The color of the lighting and sky is all controlled by the blueprint.

Lighting can be tweaked with the following properties:

  • Max Sunlight Intensity
    • The Sun’s Directional Light intensity.
  • Max Moonlight Intensity
    • The Moon’s Directional Light Intensity.

Stars

The stars are visible during night time. They are created by a spherical texture of stars.
If preferred, it can be changed using the following property:

  • Star Texture
    • Controls the texture of the sky at night time.

Post-Process

Post-Processing could really change the outcome of the sky. Because of this, the Blueprint comes with a post-process volume, where all the parameters are tweaked to make the Skybox look good.
However, users might already have a post process volume in their level, with all the settings tweaked specifically for their map. Therefor, the post-process volume could be overwritten by a user defined post-process volume with the following setting:

  • Custom Post-Process Volume
    • If this is not None, it will use the post-process settings from this volume.
    • If this is not filled in (None), it will use it’s pre-defined post-process settings.

Fog

Fog is used to mask the clouds in the background, but also to enhance the atmosphere of the scene. The Blueprint comes with an exponential height fog, and some of the settings can be altered in the blueprint. Keep in mind that the size of the sky can change the outcome of the fog on the sky. A bigger sky will apply more fog on the clouds then a small skybox.

  • Fog Density

  • Fog Height Falloff

  • Fog Max Opacity
  • Fog Start Distance
  • Fog Height