REX Essential PLUS

Real Environment Xtreme is a fifteen-time award-winning, photo-realistic, hi-definition professional graphics package, weather engine & flight planner for Flight Simulator X, Flight Simulator 9 (FS2004), PREPAR3D and X-Plane 9.


REX Essential PLUS is a fourteen-time award-winning complete weather engine, texture environment & flight planning add-on for Microsoft Flight Simulator X and Lockheed Martin's Prepar3D

We are committed to maximizing the weather, planning and flight realism experienced by our flight simulator customers. With over 12 years of combined research and development, the REX line of products have become the benchmark utility for flight simulator pilots, offering a wealth of features and advances in technology.

New in REX Essential PLUS is the WXPLUS mode, a second weather engine mode utilizing the weather theme process.

This process injects real-time live weather, archived weather and even custom weather into FSX/P3D. This process is extremely fast, eliminates flashing and does not affect frame rates. We have also included the Synoptic and Micro weather station features adding more depth to this new weather mode. Weather Engine Plus injects real weather including real winds and temperatures aloft. To sum it up, there are two modes in which to inject weather into FSX/P3D: the standard station mode or the Weather Engine Plus mode.

We have also included the new synoptic and micro weather station processes which allows for trans-oceanic flights utilizing real weather. This technique populates areas with few weather stations for a more robust weather experience allowing you to experience the effect of real frontal systems. Synoptic weather stations handle large areas of weather, which in turn produces the effect of large weather systems. Micro Weather Stations help with transitioning from local weather conditions, helping with fog, wind and precipitation transitions.

REX Essential PLUS allows you to control environment, water and airport textures, as well as lighting effects that are so critical to the enjoyment and immersion within the flight simulator experience. All of these features may be fully manipulated to your individual tastes.

REX Game Studios has partnered with FlightAware, the leading aviation software and data services company to expand upon real-world flight planning within REX Essential PLUS. Read more about these exciting features and more below in the following sections!


  • TWO Newly-engineered, industrial strength weather engine modes with integrated real-world winds and temperatures aloft
  • Random weather generator
  • Weather Cubed Technology with server-side functionality, takes the processing duties off of the host computer for smoother frame rates within flight simulator environment
  • Built-In FlightAware flight planning capabilities within the new REX Flight Center. Ability to search for real-world, real-time IFR flights scheduled at a single airport or between routes between two airports. You are provided details about the flight and then able to import the flight plan into FSX or P3D via REX Essential PLUS
  • REX Edge Technology allows community integration such as sharing texture and flight plans with other REX users around the world. All REX users are now connected in various ways to each other, thus allowing them to share their creations with other REX users
  • Accelerated texture installation process. Added ability to reduce install time with a click of a button
  • New Environment Sounds! REX Essential PLUS now includes true environment and weather-related audio
  • Hi-definition, ultra-realistic 3D clouds and realistic rendering of cirrus clouds as seen in the real world
  • Sky color environments, including smoothing horizon transition & visibility smoothing for dawn, day, dusk & night textures
  • Convincingly real water environments with tropical reef simulation (end user color controllable, including tropical with reef simulations, inland and ocean, wave turbulence/frequency, environment variants & coloring. Also new realistic type of wave and reflection included in many variations for shader 1x and shader 2x INCLUDING DX10 Compatible)
  • Airport environments (photo-real asphalt & concrete runway textures, new runway and ground bump-mapping, asphalt taxiways, concrete taxiways, realistic taxiway markings, airport signage, airport parking and general photorealistic airport ground scenery)
  • Multiple variations of sun, lens flare & lightning bolt algorithms, which creates a visually stunning array of lightning situations
  • Fully integrated to select sky, cloud, water, airport, and effect themes based upon weather situation, season, and other synoptic, mesoscale, and micro weather conditions
  • Enhanced Cloud Simulation to give a more 3D volumetric feel to cloud structures and the atmosphere
  • Lighting environments (runway lighting including simulated ground glow, stunningly realistic aircraft spotlights with variations for small to large aircraft, aircraft strobe lights, variations for add-on aircraft as well)
  • 3d cloud & water resolution options for performance preference
  • Flexibility to work in tandem with other vendor weather & texture packages
  • User-friendly intuitive and visually pleasing interface

"This piece of software is a must if you want a stunning visual while flying day or night. It will bring a NEW dimension to flight sim and you will not believe it until you take off and see the 3D clouds, sunsets and the water effects on inland waters and ocean corral. It is a sin that this company didn't originally write FSX."

Lester Hesley -5 of 5 Stars!


Weather Engine


Weather Engine Interface Samples

We have coded with the idea of four dimensions rather then two, adding our newly-invented technology called "Weather Cubed"

Weather Cubed looks at all areas surrounding the aircraft. We give many configuration of these settings within the configuration manager, but many of these features are now handled internally with the use of the weather data platform we have in place. Since most of the processes run outside of FSX/P3D, we are able to compute complex math processes in order to help the weather engine apply as much realism as possible.

In REX Essential PLUS we now integrate real winds and temperatures aloft, tapping into the data sources that provides real temperatures and winds aloft for the world provided by balloon data. We allow you to not just configure the winds, visibility, and clouds; we also allow you to balance the injection process of the weather. We found that one can get better frame rates by controlling how the weather is injected over time. In other words, we allow you to adjust how each weather station is loaded over a period of time.

We give you the ability to fine tune the weather injection process so that you can get the best frame rates possible.

The Interpolation Process

Metar stations that report weather data today do not reflect the number of weather stations within FSX/P3D. Many of the stations in FSX/P3D do not report real weather in real life. However, we wanted to be sure all stations in FSX/P3D have weather to report. We populated the REX database with all of the weather stations from FSX/P3D, then take real weather data and bump it up against that database. So those that match, real weather data is used. Those that don't have weather, we look to the closest neighbor to get the closest possible match.

Within REX you have the ability to set the range of stations to interpolate weather data. This gives FSX and P3D a more rich and smooth flight experience.

Two additional new features within REX Essential+ are the inclusion of temperatures and winds aloft on the interface and within the NAV LOG and updated current SIDS/STARS/Intersections/Waypoints for better representation of flight plans.

You Can Even Create Random Weather Scenarios

A very interesting feature of REX Essential PLUS is the RANDOM WEATHER area. This feature allows the program to generate a large number of random weather scenarios for any location on the globe you desire.

Ever wanted to fly in a snow storm in Hawaii? You can with this feature. Additionally, REX can choose textures that will best represent the weather and install them into flight simulator for you.

"The graphics will blow your mind. I found myself just aimlessly flying at all times of the day in awe. Wow! Great job developers."

Gregorio McKoy -5 of 5 Stars!


Flight Center


Flight Center Interface Samples

We have partnered with and embedded the technology of FlightAware into REX Essential PLUS

With FlightAware incorporated into REX Essential PLUS, you are able to search for real-world, real-time IFR flights scheduled at a single airport or between routes between two airports. You are provided details about the flight and then able to import the flight plan into FSX/P3D via REX.

If you decide to fly a real-time, real-world route, REX will provide current flight notifications via the weather engine while in-flight. If selecting an airport to search, then navigate to another module of REX, you will be provided regular alerts in REX of the next flight scheduled to depart from that airport. REX Essential will give the most realistic experience possible with real-world, real-time flight plans from most major airlines and countries across the world.

Share Your Flight Plan

Imagine, you just flown a really interesting flight plan you created through REX, a third-party flight planner, FlightAware, or even FSX/P3D and now you'd like to share it with others or save it for later use. With our new REX EDGE Technology we provide the ability to share your flight plans with other REX users around the world. Read more about REX Edge Technology in the section below!

We still provide a means to create a flight plan, but now when you create a flight plan either by FlightAware, importing a flight plan from FSX/P3D, other third-party planners, importing a community flight plan, or creating your own, you will be provided a detailed view. You can view the plan along with all of the associated waypoints including real winds aloft data for each waypoint. So programming your FMC within the latest installment of a third-party aircraft is much easier.

With REX Essential PLUS you can export your plan and set your parking starting point. No longer will you start at the end of the runway, but you can select whether you want general aviation parking or to start from a gate. If using FlightAware within REX, you can select the actual gate in which the plan states in its report.

With our new Flight Center, we offer complete realism as well as the community aspect.

"The most extraordinarily beautiful and revolutionizing add-on that I've ever purchased. In short I want to say 'good work', because I am not one generally for writing in and giving praise but I think you guys have done a fantastic job."

Neill G -5 of 5 Stars!


Texture Engine


Texture Engine Interface Samples

The REX Weather Platform in conjunction with the new Texture Engine creates a whole living ecosystem. With OVER 14,000 custom textures, your flight environment will never be the same!

REX Essential PLUS offers over 10GB of high-definition graphics textures at your fingertips. User-selectable options for use with low to high end computer systems. Easily assemble your own texture variations.

Clouds that look like real clouds, sky that shades correctly based upon polution and particulate matter, and water that truly reflects the hues given it from light and particulates. The REX Essential Platform does all this, and much more for you.

Users with lower-end systems can select compressed algorithms with minimized visual anomalies, as usually associated with this type of compression.

The new weather-influenced process has been completely re-written inside REX Essential PLUS. You will experience conditions closer to what is actually happening in the real-world. This process will give you a wider range of variety utilizing all textures within REX Essential PLUS.

Within REX Essential PLUS is the ability to share your texture themes with the REX Community.

If you create that killer look and would like to share it with others, you now have the ability to do that. Or with the simple click of a button you can install a user's texture theme in a matter of seconds. We have added categories to texture themes so that you can now search by creator name or texture theme category.

We have also sped up the process of installing textures. We have added the ability to reduce the install time with the click of a button. This will only install key textures such as sky, clouds, wave animations, and runways/taxiways. This process eliminates the need for decompressing large water textures and resetting to correct resolutions before install.

  • Cloud textures including cumulus, cumulo congestus, cumulonimbus, nimbo stratus, strato cumulus, cirro Cumulus, alto cumulus, cirro stratus, wispy cirrus
  • Sky textures including daytime, dawn, dusk and night
  • Create your own inland blue and inland brown water variations, as well as ocean and tropical water coral textures
  • Ocean and inland 3D wave animation rendering, ranging from calm to stormy seas
  • Airport environments including asphalt and concrete runways, asphalt and concrete taxiways, customized taxiway markings, runway markings, airport parking and surface refraction
  • Sun and lighting technology including sun, flares, lightning, landing lights, aircraft strobe lights and runwaylighting


"REX has truly has changed my flight sim experience. It would take me too long to describe all the things this program improves but let me say the clouds and water effects are amazing."

William Vick -5 of 5 Stars!




REX EDGE Technology is REX Game Studios' Version of its Own "CLOUD" Technology

REX EDGE Technology is an array of dedicated servers that have been setup to handle the transfer of large amounts of data to be utilized not only within REX Essential PLUS, but in all future projects. This technology has allowed us to expand the connectivity of REX Essential PLUS. All REX users are now connected in various ways to each other, thus allowing them to share their creations with other folks around the world who are using REX Essential PLUS.

With REX EDGE you now have the ability to share your texture themes with the REX Community.

Suppose you created that killer look and wanted to share it with others - you now have the ability to do that. Or with the simple click of a button you can install a user's theme in a matter of seconds. We have added categories to themes so that you can now search for the favorite theme by creator name or theme category.

With REX EDGE we also have included the ability to back up your texture themes. Therefore, if you create 100 different themes, you will never lose them if you have created a backup/restore account. It is that simple! Or in the case of when we issue an update, in the past you would lose your created themes. With this new function you will be able to restore your themes automatically after the update has been installed.

REX EDGE also allows us to bring together a repository of weather data.

Every 10 minutes we are downloading and storing the latest weather information from NOAA and VATSIM. We just recently implemented the storing and archiving of real upper-level wind and temperature data from world's radiosonde reports. This is extremely exciting to us in that instead of providing a forecast we are now the only one providing accurate real-time winds aloft data. We have found that this data has significantly reduced the quick changes in winds shifts aloft. Though we are still bound by the limits of FSX technology, this still brings a realism not found before in the flight sim community.

Another example of how REX EDGE is used within REX is after you configure the program, you will be prompted to setup a user account. This will create a user profile on our "cloud" servers. When you save your user configuration in REX, it will be saved locally on your machine and also on our "cloud" servers. If for some reason you need to re-install Windows or REX, all you have to do is simply login and your original settings will be reset from our servers. You will not be required to login each time you open REX, as that process will be done for you automatically.

This EDGE technology also opens up a huge amount of potential in other areas with future projects, thus allowing us to connect all of our technologies together.

"If you like FSX then this is a must!!! I wont fly without REX turned off. Cloud formations are so real, and it's great to see the coral reefs in the oceans when you fly over them."

Ian Hirsti -5 of 5 Stars!


Sound Effects


In-Flight Sound Sample

NEW Environment Sounds

REX Essential Plus now includes true environment and weather-related audio. We went through great lengths to maintain a certain 'sound' through a meticulous mastering process.

REX Game Studios owns and operates a full-fledged recording studio complete with its own mastering facility using state-of-the-art equipment and we spared no expense to bring the sound experience to our users. The dynamic sounds of rain, wind and thunder will blow you away.

"This is bar none the best add-on product for FSX. It actually increased performance on my rig! The weather engine is very realistic. Clouds are gorgeous and sometimes downright scary in bad weather conditions."

Anthony Yacono -5 of 5 Stars!


Download Center


NEW Download Center

The download center is a new method in which REX Game Studios® can pass along new and updated material developed for FSX or Prepar3D to our customers. The process of installing or reinstalling the new material is all handled within the back-end of REX Essential PLUS. Think of the download center as a marketplace for new things to add life to FSX/P3D.

With the simple click of a button the original material within FSX or Prepar3D is backed up and the new material is installed. If you ever need to re-install the new material, revisit the item you wish to install and simply click INSTALL again.

The download center will be growing over time with new and fresh material from our development team.

"Everybody involved in REX are the best of the best. No exceptions. The Real Environment Xtreme program took a LOT of time work and money to produce. Nothing will prepare you for the awesome change that REX performs to FSX. This is the best there is. If you have not bought this yet, your really blowing it big time. The best money you ever will spend on FSX. Just get it!"

Gary Johnson -5 of 5 Stars!


Options Manager


Options Manager

The Options Manager allows you to select which options are installed into FSX/P3D. The optimization area controls the resolution and algorithm of textures installed, and an overall system performance section allowing the program to decide which settings are best suitable depending on the capabilities of your computer system.

"This program makes your flight sim shine. Literaly. A very good buy."

Charles Artis -5 of 5 Stars!


Control Panel

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