Simul trueSKY is now available as a plugin for Unreal Engine 4. It comes in two versions: for professional developers, the full-featured trueSKY comes with full source code on PC, Xbox One and PS4. For independent and amateur developers, trueSKY Alpha comes as a subscription for Windows PC. You can buy a licence for £100. Monthly subscriptions are available at £15 per month, and as with the annual version, are royalty-free.


trueSKY Alpha

  • Unreal Editor Integration
  • Binary

trueSKY Alpha

  • Unreal Editor Integration
  • Binary


  • Unreal Editor Integration
  • Source Code
  • Day-night cycle based on latitude, longitude, time-of-year
  • Dynamic volumetric atmospherics and fog
  • Fully volumetric clouds – no sprites, impostors or billboards
  • Real time weather changes – create keyframed weather sequences
  • Rain and snow – define movable precipitation areas.
  • Full integration: drive Unreal Engine’s lighting from trueSKY


trueSKY works with Unreal Engine 4.8 and above. To build the plugin you must obtain the Unreal Engine source code from Epic, and it is recommended that you are familiar with the process of building UE4 from source, and basic source code editing. If you are unsure, please contact Simul on the support address below.


The instructions for installing trueSKY in the Unreal Engine can be found at


Contact Simul on