Hi I realize that it's almoust impossible to understand what is what in the small squareish pixellated map that shows up when defining a region area to wich you want to assign a weather type , how do you do to recognize the shape of the terrain and consequentally add the proper region boundary ? I can't understand anything from the simple pixellated white map there !

The way I did it with Oblivion was to generate an image file from your ESP or ESM using TESAnnwyn to export the terrain(with the -g option to overlay a cell grid). I have successfully used TESAnnwyn with Skyrim to CREATE (import) a worldSpace terrain with vertex coloring, so that app SHOULD be able to export one back out again. The instructions for TESAnnwyn are fairly confusing, so if you need help as to what command-line to use with which options - lemme know. (I DO know I had to use the FO3 settings, NOT Obliv's)

Now you should have a color map with black gridlines... I used Photoshop to insert numbers into the image at various intervals, so to see an area's cell number quickly. My worldSpace is as large as Skyrim itself (several quads), so it took a little while... but it was worth it for my project, as I have several region types and areas. Then, with that exported map, I traced colored pencil-lines over the border cells where I wanted to place my region - then in the CK you'd open the region editor. Looking at your marked-up map, you should be able to see which cells require a region marker (indicating a corner)... mouse-over cells in the region editor to see their cell numbers.

An easier way, if you have a relatively simplistic worldSpace, would be to just make a basic square or other simple shape. In the CK, locate which of your cells are the 'corners' and write them down (I don't remember it allowing one to switch between region-editor and render-window)... then assign them in the region-editor.

svcks... I know - but I'm not the one who designed the CK/CS. I agree that it should have SOME kind of basic terrain overlay - even just water vs land would help.

I do it in a simimar way, I create maps with a cellgrid on to have as a referense.

tough I think my map is 2048 x 2048 original , with a central island around 1024 x 1024 pixels in size , but the regions are pretty intermixed , nopt that I need that many , I mostly would need 3 regions but they are quite complicated to understand what is what .... I do not have many color maps but so there is no way to import a colored map of the region in the region editor? or better an external tool to write down the data information for the regions to use?

also if I am not wrong Tesannwyn flips the region map?

I'm not talking about importing the color map, if that's what you thought I said... I meant to simply use that map as a visual reference. Have it open in your preferred image viewer while the CK is running, then strategically scale and place the image so that you can alt-tab over to it easily (even better if you have a screen large enough you don't have to switch ack and forth).

I placed numbers in my image because it's so huge... that way I can quickly scan across, and every 5th cell or whatever is labelled and/or has a thicker or different color gridline. The larger areas has different lines, so I can quickly skip over to an area and already know the general vicinity... zooming in I can count down to see the exact cell the needs to be marked in the region editor and for which region-type.

I think there IS a way to import some kind of special map to define regions or other things automatically, but I think that was for Obliv... if for anything outside my imagination at all. It may have used a 3rd party app... I don't remember. If it's true, the odds of it working in Skyrim are pretty slim anyway, I'd say.

This is how I'm doing it for mine:
http://i.imgur.com/1EWvo.jpg

But I haven't actually painted any regions yet because I'm using them for object generation, and it takes a really long time so I want to be certain.

I really can't believe Bethesda did it like this though, I hope there's a better way to do it that I'm just not aware of.

And TESAnnwyn flips your heightmap, yes, it's not just the region map.

why not by hand?

Is there a way to preview the weather created in the CK ?

Ehhh, if you turn on the sky it simulates the Skybox/weather but I'm not sure if there's a way to control what weather it simulates. (It always seems to be a generic type) It certainly seems possible. Look around for a setting or something. That would be really cool.

I cant find anything to preview similate the weather you are working with .....