REX 5 - Environment Force for P3D v4.4+

Environment Force breaks the paradigm, with its full dynamic, real-time (on-the-fly) living environment and real-time (on-the-fly) advanced shader processor, allowing instant visual feedback. Environment Force allows a new and different approach to the environment, atmospheric and shader-related effect factors that cannot be accomplished any other way.

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This product is currently not compatible with Lockheed Martin's Prepar3D v5 and is ONLY compatible with Prepar3D v4.4, v4.5.

Manage, Adjust or Automate – Everything!

Real-Time (on-the-fly) Dynamic Living Environment
Real-Time (on-the-fly) Advanced Shader Processor
Compatible with all other add-ons!
Optimized for REX 5 - Sky Force 3D




On The Fly Dynamic Living Environment and Atmospheric Utility

Includes live cloud and sky texture sync technology and our new real-time advanced shader processor and in-sim interface for live tweaking and saving capabilities.

Real-Time Environment Simulation Automation and Tweaking Flexibility

Enjoy instant, on the fly visual feedback, whether you are tweaking the sim to your liking or allowing Environment Force to automatically adjust the environment for you... all while the simulator is running.

Live in-sim environment shader tweaking. 

– A convenient and powerful in-sim shader tweaking utility is also provided with the ability to save your creations.

– You can even use your other shader tools without the need to re-open your sim, as Environment Force recompiles shaders on the fly.

– User-controlled cloud formation and dissipation control, cloud coloring, visibility and fog control, scene and cloud lighting, terrain shading, water appearance control, water and terrain coloring, 3D clouds / cirrus clouds / sky texture sync.

Living dynamic weather and smooth environment changes for all weather engines, including REX Sky Force 3D, Active Sky, Opus, FSGRW, FSXWX and REX Essential Overdrive.

– Witness weather smoothly change over time.

– The world changes its atmospheric and terrain properties depending on weather.

– Automatic cloud morphing, scene and cloud lighting, environment shading, water control, 3D clouds / cirrus clouds / sky texture sync.


New, Non-Destructive API

The API works on the simulator run time layer and does not change any of the core framework of the simulation.



Choose to Control or Automate

With Environment Force, you can now control the key weather and environment features in real-time, such as: Cloud morphing, sky and cloud coloring, sky and cloud texture swapping, visibility, water coloring and shader control, terrain and object coloring, and cloud / water / terrain / object / scene lighting. Or you can simply set it and forget it, with the smoothing controls for all weather parameters AND weather engines.


Breaking the Paradigm

Accomplish a living environment controlled in real-time, on-the-fly giving instant visual feedback.

Different Modes of Operation

You can enjoy tweak-free operation known as Automation Mode. This mode allows Environment Force to automatically control and change key environment visuals on the fly, in real-time as dictated by real-world weather. Or adjust visual settings in real-time within the simulator via the in-sim mini UI modal window. Manual Mode will allow you to take control of key environment elements and shape your environment to your liking. Adjust more visual settings in real-time within the sim via the in-sim mini UI modal window.

Living dynamic weather and environment changes for all weather engines

– Automatic or manual cloud manipulation and morphing.

– Automatic or manual cloud morphing.

– Automatic or manual cloud coloring.

– Automatic fog smoothing.

– Automatic or manual scene lighting.

– Automatic or manual cloud lighting.

– Automatic or manual environment shading control.


In-sim mini user interface included for greater control of effects

– Automatic or manual water appearance control.

– Automatic or manual environment coloring control.

– Automatic or manual water and terrain coloring control.

– Automatic or manual 3D cloud texture sync.

– Automatic or manual cirrus cloud texture sync.

– Automatic or manual sky texture sync.

– Community-based cloud server to upload and share presets.



Cloud Component

When using a real-time weather engine, this component provides more accurate properties to clouds as they dynamically transition on the fly.



Live Mode Automation

You can enjoy tweak-free operation known as Automation Mode. Customize to your liking. 



Live, On The Fly Sky and Cloud Texture Sync

Load cloud and sky textures live on the fly or allow full automation dynamics. Requires Sky Force or Texture Direct. We are currently working on an API for use with other texture add-ons.



Smooth Weather System Transitions

With Environment Force you will be able to experience smooth weather system transitions with ALL weather engines as clouds and weather will smoothly transition in and out over time.

Tight Integration With REX Sky Force 3D

The Environment Force API integrates with REX Sky Force 3D. If you have Sky Force, Environment Force will utilize its weather features for the ultimate in smooth weather and visuals.

Environment and Weather Synchronization

With the power of two components from the Environment Force API, the environment will transition and respond to weather conditions live, on the fly. If the conditions become stormy, clouds change in structure as well as terrain coloring, sky colors, and water functions change in unison. In short, the flight simulator experience is no longer static... it lives.

Simconnect Independence and the Future

One of the major benefits of our new Environment Force API is that it’s COMPLETELY independent of the often flawed Simconnect platform. Our new Environment Force API not only offers great performance, it also allows us to continually advance and broaden the API for future features.



Friendly and Easy to Use

Enjoy a friendly and easy to use, feature-packed application user interface.


Never Miss an Update!

Includes a built-in auto update feature which allows you to easily update your software.



Built-In Community Preset Sharing

On the fly preset sharing allows you to quickly get setup with your favorite tweaks from your friends or content creators. Select a preset while the sim is open, click INJECT and voila!



Environmental Life Technology

Currently the weather and environment remain static, even with real-time weather engines. Environment Force now gives life to a stagnant experience, as the sky and clouds now morph and smoothly transition over time and are always changing in density, size and atmospheric coloring... all in real-time.



Plays Well With Others

Compatible with all weather engines, texture/graphics and shader add-ons out of the box.

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Refund Policy


No refund, credit or replacement of any kind is available for download products. It is your responsibility to transfer your purchased download products from our servers to your computer. Considering the technical nature of the internet, REX Game Studios will make every effort to resolve any issues you may have while attempting to download your products to ensure successful delivery.

Minimum Requirements


Flight Simulator:

Prepar3D v4.4, 4.5 

Windows Operating System:
Windows 7 or higher

RAM Memory:
8GB or higher

Hard Drive Space:

Video Card:
DirectX 11

Internet Connection:
Required for installation, registration and operation

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