Soluna: Dynamic Sky

A day and night sky for URP with a real sun, moon, planets and stars. Set the time of day and you’re done. Warm look out of the box, one prefab, built for Unity 6.

• Atmosphere after Hillaire 2020: transmittance, multiple scattering and sky-view lookup tables rendered on the GPU.
• Sun to about 1 arc minute, planets to a few. Refraction and lunar parallax.
• Stars are one mesh in one draw call, coloured by each star's B-V index.
• Moon is a lit sphere with procedural maria, or your own texture.
• Optional day/night cubemaps with a sun-height crossfade.
• C# API for time of day, moon age, sun and moon direction, moon phase, sunrise and sunset times.
• Menu: Tools > Soluna.
• Unity 6000.6, URP 17.6, shader model 4.5.

Description

Soluna: Dynamic Sky puts a real sun, moon and night sky over your world and sends their light through a real atmosphere. Twilight goes blue, the sun turns red at the horizon, and at night the Milky Way, the planets and 9,090 real stars come out where they belong.

You set the time of day and the sky does the rest. Sun light, moon light, ambient light and fog all follow it, so the scene always matches. Midnight loops round without a jump, and a few sliders take the look from warm storybook to plain physical.

Setup is one step: drag the Soluna Dynamic Sky prefab into your scene.

What’s in it

• A physically based atmosphere. Golden hour, blue hour and a white noon sun come out of the physics, and it costs about what a cubemap does.
• The real sun and moon, with a moon cycle that shows the right phase on the right side. Speed it up so players see every phase, or pin the full moon your scene needs.
• The real night sky: 9,090 naked-eye stars in their own colours, five planets, and a Milky Way with dark dust lanes.
• Height fog that takes its colour from the sky and breaks into light shafts through your scene’s shadows.
• Your own day and night cubemaps if you want them, mood settings, and a day clock you can pause, skip or drive from a script.
• A demo scene with the sky on its own.

Please read before buying

• Needs Unity 6.6 (6000.6) with URP 17.6. Not HDRP, not Built-in.
• Needs shader model 4.5. Not tested on phones or in VR.
• No clouds in this one. Soluna: Dynamic Weather adds volumetric clouds, rain, snow, fog and lightning, or get both in Soluna: Complete Atmosphere.

Good for

Open worlds, survival and farming games, sailing and flight games, and anything with a horizon and a clock.