Trying hard (two heads actually thinking) to fix an issue with scalability, where when you change it to anything lower than Epic, the clouds disappear. During this investigation we found out that the issue is not with the main material (where there are mostly HLSL code), but something related to the Render Targets. So, for now we are looking deep into the engine source code to figure this out and while doing this we made accidentally a discover that will improve the shader a bit regarding performance and also what we can call version 2.0 with great looking clouds!