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3D Cloud Model Structures:
The Current Dilemma with Prepar3D and FSX Weather System

There are many limitations in the way clouds and full weather systems are displayed. Currently, randomly placed sprites rendered inside the simulation causes cloud types to be mis-represented in all weather scenarios, and also causing a severe decrease in frame rates.

According to real-world cloud specifications, cloud thickness is lacking on all cloud types, including position and overall representation. Even with costly similar aftermarket products installed, you still notice upside down clouds and inaccurate cloud formations and cloud bases represented without true volume accompanied by thin, patterned cloud bottom textured skyscapes.

Overcast is not truly represented and contains open areas or holes. There is limited thunderstorm representation and specification, containing no true severity level as well as no precipitation visuals. 5/8, 6/8 and 7/8 conditions and formations are misrepresented, with NO ability to add certain cloud classification, such as rain shaft, wall clouds, shelf clouds etc.

It took our team nearly 3 years to re-design the entire cloud model weather system, and in doing so, increased frame rates by eliminating unnecessary cloud sprites for all cloud types.


Superior Cloud Mapping

We have successfully created superior cloud and weather formations containing precise definition for each cloud type. With Sky Force 3D, the simulator will now be able to implement soft and more robust detailed clouds structured together within the same session.

Superior 3D Cloud Structures

In addition, we have developed over 3,000 new cloud model structures and cloud types. Sky Force 3D simulates real-world cloud classification; from uniform clouds to full and complete mature stage cloud structures. The 3D Cloud structures are now correctly and accurately displayed, and detailed clouds will NEVER be represented upside down.

Superior Cloud Classification

We have added NEW clouds types, including; altocumulus, stratocumulus, humilis, mediocris, congestus, tower cumulus, cumulonimbus calvus, supercell and rainshaft, tornado, stratus, nimbostratus, altostratus and cirrus class.


Other weather engines are forced to synthesize multiple overcast layers to try and mask the holes present within the flawed overcast model system.

In most cases these ‘workarounds’ destroy FPS in dense cloud cover. With REX Sky Force 3D's new modeling system, full overcast conditions have met. No gaps are noticeable in full overcast conditions at any level.

Development Based on 
Real-World Cloud Classification.

Each of the 3000+ 3D cloud model structures were developed in comparison to their real-world counterpart, with their own specifications, positions and heights. Now you can even experience cloud streets with specific cloud types, super cells, wall clouds, funnel, shelf, rain shaft and tornado's! 

Realistically Rendered Weather Systems – Sub Cloud Types Within Severe Weather Cloud Categories.

REX Sky Force 3D has the ability to display sub cloud types from existing cloud types. For example, supercell clouds can contain high or low precipitation, thus making the supercell large or standard. These processes are applicable for all severe weather cloud types within the simulator. Even with after market products installed in Prepar3D and FSX, the weather systems are severely lacking due to the cloud structure SDK. Sky Force 3D breaks this barrier!

True Cloud Thickness and Formation Realism

Currently in the sim, even with similar after market products installed, it's not uncommon to notice upside down clouds in bizarre and unrealistic positions, cloud bases that are presented with repeating patterns and no true volumetric feel, in-appropriate texture types, all of which affect the overall realism in flight.


We even increased frame rates by eliminating unnecessary cloud sprites cutting down on GPU usage. The 3D Cloud structures are now correctly and accurately displayed, and detailed clouds will NEVER be represented upside down. 


We have also created the ominous cumulonimbus (thunderstorm) 3D cloud model system and representation as well as supporting textures. By examining real world weather conditions, we introduced the most feared of pilots and man - the super cell.


Our new cloud system models storm structures reaching 70,000 feet. We also modeled the base of our storm clouds and added rain shafts to calvus and incus cumulonimbus clouds of various intensities, adding to the realism. Also included are wall and shelf clouds, and in some circumstances these will include funnel clouds and tornadoes of various shapes and sizes.


Sky Force examines the metar report and syncs the newly formulated weather structures (3D cloud models) to match the upcoming weather for the current location while in-sim. Thus, cloud models actually match the weather conditions. The correct type of cumulus, stratus, nimbo-stratus, or cumulonimbus clouds will be selected based upon true real-time weather conditions.

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