REX
REX offers two important elements through its different products: 1) A weather engine that downloads real weather in your computer while replicating the different weather phenomenon, through its REX Essential Plus program and 2) very realistic cloud textures (through its add-ons like Overdrive, Texture Direct, Soft Clouds).
A flight planning mode is also included, as well as numerous options to create specific weather themes that take care of the appearance of the clouds, the quality of the light in the sky, the definition of the sun effects, the different textures and colors of water.
You also have the possibility to choose different runway markings, the sounds associated with thunderstorms and the type of lightning that will illuminate your virtual sky.
REX is compatible with all platforms, including X-Plane.
Here are the REX products, which each play a very different role:
REX Essential Plus: a weather engine and a product that contains cloud textures and multiple options in order to simulate as much as possible the real outside weather for the area you have chosen. The weather engine will soon be renewed with a new addition: REX Weather Direct.
REX Overdrive: adds 12 GB of cloud textures.
REX4 Texture Direct: adds another 16 GB of cloud textures, and a possibility to create complete weather themes according to your preferences, while you still have access to other themes created by all the virtual pilots of the REX community.
REX Soft Clouds: adds volumetric clouds in the lower layer of the atmosphere for a more realistic effect.
REX4 Weather Architect: a program that allows you to create a precise weather system then position it anywhere on the planet. This is not a weather engine: It will not look for new data on internet and download it in your computer.
REX Weather Direct: a soon to be released improved weather engine that will be compatible with DX9, DX10 and DX11 as well as with FSX, FSX: SE (Steam Edition) and P3D.
On virtual flying forums, users seem to have a preference for the Active Sky Next (ASN) weather engine combined with REX cloud textures. This is a good combination, but it’s not the only one that deserves attention: FSGRW together with REX cloud textures do an excellent job (this is the duo that I am using for very precise results). There is also OpusFSI with REX, ASN with ASN2012 (ASN weather engine combined with ASN2012 cloud textures) or even a REX only set of programs (soon to be available REX Weather Direct and REX cloud textures).
This all depends on your priority: the FSGRW simplicity and absolute realism, the facility to use a cockpit camera and the dynamic head movements supported mode of OpusFSI, etc. It is best to read a lot and take the necessary time before jumping to quickly to a conclusion.
Some weather engines might need tweaking or modifications to be compatible with the most recent versions of P3D, if we believe what is written on specialized forums.
Here is the link: REX
For more weather engines, click on the following link: Other weather engines
For more articles on flight simulation on my web site, click on the following link : Flight simulation