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Download OverCloud FREE Unity. 

OverCloud provides a complete, scalable solution for rendering a realistic, volumetric sky from any camera position and angle above the horizon. It is perfect for flight simulators, huge landscapes, or any developer looking for a simple-to-use, dynamic sky.
Unity default rendering pipeline (forward or deferred). Compute shaders (DX11).

Volumetric cloud plane
Accelerated by a unique particle-grid rendering method, which only spends fill rate where there’s actually cloud coverage. Supports advanced effects such as ray-marched, energy-conserving lighting, cloud shadows, cloud ambient occlusion and cloud coverage probing on the CPU.

Physically based atmospheric scattering
OverCloud includes a tried and tested pre-calculated atmospheric scattering solution which is used to render the sky and aerial perspective. It also automatically fades the scene into the skybox based on the far clip plane, so your world always blends smoothly with the atmosphere.

True volumetric height fog
OverCloud supports a global height-based volumetric fog effect, which perfectly blends with the atmospheric scattering. Move the camera into the volume and watch the sky disappear above, or fly above the clouds during heavy weather to catch a glimpse of a clear sky.

Volumetric Lighting
OverCloud generates crepuscular rays which take into account both cloud and world shadows. Additionally, it supports volumetric point and spotlights which mix perfectly with the global fog and clouds.

Physically based time of day
Set year, date, time, latitude and longitude and watch the sky position itself correctly. Sun and moon elements are properly rendered in the skybox with physical sizes, it even supports solar and lunar eclipses.

Fully compatible with scene view
All effects support rendering in the scene camera (via main camera hook) so you can tweak the result without having to run the game.

Preset-based weather system
Tweak a number of parameters for the clouds and sky. Smoothly fade parameters between different presets. Supports adding your own float variables which can be used to drive custom effects.