This is a paid asset, but now you can download trueSKY Free.
Detail this asset from Simul: Original Link
Simul TrueSky v4.3
trueSKY™ – The Leading Cloud, Atmosphere and Weather Tool Kit
Unparalleled sky, cloud and weather systems with endless customisation.
Turnkey Solution for Sky & Weather
Install the trueSKY plugin in Unreal Engine 4 or Unity to get started. For seasoned developers, you can include the trueSKY API calls in your rendering pipeline.
Using our Sky Sequencer, you have endless customisation for all of our features, from Clouds to Atmospherics – all editable in real time. When a battle commences, summon a storm. When an achievement is reached, bring out the rainbows. All of our settings can be changed through blueprints, scripts or code.
trueSKY is always aiming to be as efficient as possible when it comes to performance. We aim for 2-4ms per frame at default settings, but provide multiple tools to adjust performance or quality to your specific needs.
We support most major platforms and APIs, and then more if need arises. From PlayStation and Xbox to Linux and Windows – we support it.
We believe virtual reality will be a big part of the gaming industry as technology moves forward. Because of this, we have made sure trueSKY was built with VR in mind. No additional setup is required for VR, simply put your headset on and soar through the clouds!