I have both Rex 4 and Rex 3.

I bought Rex 4 because I thought, you know "Hey this obviously must be better than Rex 3, its updated, more optimized and looks a whole lot better!". Oh boy was I wrong....

 

Here is a screenshot of Rex 3 http://112.imagebam.com/download/NG9h3-yeXurJ4d4l49Ytdg/34872/348715533/fsx%202014-08-24%2017-05-05-27.png

Now here is a screenshot of Rex 4 http://110.imagebam.com/download/AvNLq5vyheL2mkQ2Jlxn4g/34872/348715629/fsx%202014-04-18%2019-14-43-04.png

 

As you can see Rex 3 looks much more vibrant and alive then Rex 4 (excluding the fact it was raining in Fsx on Rex 4, I have tried it on sunny days but the sky looks so washed out, like someone has painted it on) also as you can see on the left the cloud looks almost 2d. Today (2/09/14) I re-installed Rex 4 again, I did so and all I got was just 2d clouds they were just flat, they were not 3d like the ones in Rex 3, I tried both with Dx9 and Dx10 and they still looked 2d and washed out. I've tried all of Rex 4's settings, Texture, Options etc.

 

Also which was strange, after that I un-installed Rex 4 and installed Rex 3 again, but for a few hours the clouds looked 2d? I tried to fly on Fsx a few times 5 minutes after installed Rex 3 and they looked 2d, I waited about 3 hours and they looked 3d again? I'm puzzled? Maybe this peculiar thing also happens to Rex 4, maybe I have to wait? I'm so confused...

 

Even so if the clouds on Rex 4 do turn 3d, I think I'm going to stick with Rex 3 just because of personal preference, because the sim looks so much more vibrant and colourful compared to Rex 4.

 

Help on the 2d/3d clouds would be appreciate, also leave your opinion on Rex, whether you use Rex 3 or 4, or even use some other type of software.

 

 

Here are a few other screenshots from Rex 3

http://112.imagebam.com/download/j_bRwDNJHUYg4F7Abqevmg/34872/348716456/fsx%202014-04-17%2015-00-08-46.png

http://110.imagebam.com/download/Jc4PB9m3V_4_2SXN3TN3KA/34872/348716460/fsx%202014-04-25%2016-24-52-97.png

http://112.imagebam.com/download/s5xyNPMDWTGc4AgFZONlug/34872/348716463/fsx%202014-04-25%2016-27-07-91.png

http://110.imagebam.com/download/IO4dFrWfBdxUJ8Wjipk1dA/34872/348716468/fsx%202014-08-24%2017-05-05-27.png

http://111.imagebam.com/download/BsVnK6i4_e15m1xtY8Ib5w/34872/348716470/fsx%202014-08-24%2017-06-13-84.png

http://109.imagebam.com/download/IHwMD6UvTKSVrFtEeXR5Lg/34872/348716474/fsx%202014-08-24%2017-10-21-97.png

http://111.imagebam.com/download/jqxHilnd6eA1EIHS8BIaIw/34872/348716477/fsx%202014-08-24%2017-10-47-63.png

I agree with you. REX3 Clouds do look better than REX4 Clouds. However they do seem to be better in REX4 with the latest update in P3DV2.3. Right now my biggest grip with the REX4 clouds is the very easy to spot repetition of Textures. I never really noticed that in REX3 but I am sure it was there. It looks to me that you are using the highest Texture resolution in your REX3 Screen shoot. They look great but I actually think the clouds look more realistic on lower Texture resolutions and of course performance is better too. REX really nailed the Billowing Cumulus effect in REX3. It was very compelling. I see that a lot less in REX4. All in all I agree with you but as I said I do see improvement in REX4 since its release.

I see his point too that REX 3 clouds do look better with the resolution up high but i agree with Avidean and the clouds look better and more realistic at lower resolution, I find in REX 4 the clouds have better density when u are flying threw thick cloud cover especially if u are looking at wing view and u can see the wing disappear and come back as u go threw thicker cloud and u cant see the ground until u descend below the clouds, In REX 3 i found the clouds would have patch places where it would open up even when u are in very thick cloud cover in the middle of it but not out of it and suddenly the ground would appear

 

I am REX 4 all the way and think it beats REX 3 that's why i made the purchase and the jump to REX 4 

 

Matt