by Physical Addons·Rendering
Images © Physical Addons. Used for product review; image policy.
Physical Starlight and Atmosphere - Sky ranks 11 in the superhive library. Created by Martins Upitis over 10 years of development and maintained by the Physical Addons team, it reports over 16,200 users and a 5-star rating from 146 reviews. A demo video is available.
Physical Starlight and Atmosphere - Sky is a Blender addon that renders sky and atmosphere in real time using a physics-based approach. It combines photometric measurements for sun and sky luminance with analytic air mass volume calculations, producing atmospheric scattering that works in both the Eevee and Cycles engines. Light transmission through the atmospheric volume drives sky color, sun appearance, and star visibility from real photometric measurements.
The sun disk is calculated from physical temperature in Kelvins, overall energy emission in W/m²sr, and a limb darkening factor, with atmospheric scattering adding realistic color temperature shifts. A binary sun system supports alien world creation, and procedural or texture-based stars and clouds add scattering and dynamic lighting. A ground plane with altitude control and 10 ready-to-use presets round out the toolset, with the addon at 600KB and presets under 1MB each.
Every parameter supports keyframe animation, from sun position and atmospheric density to cloud coverage and star visibility, with real-time preview in the Eevee viewport. It replaces traditional HDRI-based sky lighting and works alongside Blender's Sun Position addon. Compatible with Blender 2.81 through 4.5.
Physical Starlight And Atmosphere - Sky is best for artists in entertainment, film and animation, automotive visualization, aerospace atmosphere rendering, and architectural visualization who need physics-based sky and atmosphere in Blender.
Physical Starlight And Atmosphere - Sky is completely free to download and use.
Physical Starlight and Atmosphere - Sky lists compatibility with Blender versions 2.81 through 4.5, so it covers a wide span of releases including current 4.x builds. The addon renders in real time in both the Eevee and Cycles engines, using photometric measurements for sun and sky luminance along with analytic air mass volume calculations. It also works alongside Blender's Sun Position addon for real-world sun placement based on geography and time. For exact behaviour on your specific Blender build, the developer's page is the best reference.
Physical Starlight and Atmosphere runs in real time in both the Eevee and Cycles render engines. Its physics-based approach uses photometric measurements for sun and sky luminance combined with analytic air mass volume calculations, producing atmospheric scattering in real time. Light transmission through the atmospheric volume drives sky color, sun appearance, and star visibility from real photometric measurements. Because every parameter supports keyframe animation, real-time preview shows animation results directly in the Eevee viewport as you adjust settings.
Physical Starlight and Atmosphere uses a GPL license for commercial use, so it can be used in commercial projects. In this catalog it is listed as free; for current licensing terms and any conditions, check the developer's page. The addon is credited to Martins Upitis, developed over 10 years, with continuous updates and support from the Physical Addons team. It reports over 16,200 users and a 5-star rating from 146 reviews.
Physical Starlight and Atmosphere works with Blender's Sun Position addon for accurate real-world sun placement based on geography and time. On its own it calculates the sun disk appearance from physical temperature in Kelvins, overall energy emission in W/m²sr, and a limb darkening factor, with atmospheric scattering adding realistic color temperature shifts. It also includes a binary sun system for alien world creation, plus procedural and texture-based stars and clouds. See the developer's page for setup details.
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