This is for DoD1.3 . I've searched here and most of the links I've found are dead now. I was thinking of making overviews for some of the maps on our servers that don't have overviews. Does anyone know of a tutorial somewhere that is still around? Or can someone explain it here in 10 easy steps or something like that? :D

Umm... atm I don't have any links handy but I can tell you what I remember as it's been a while. First look for the console commands that will get you into the overview mode in HL. They may be similar to HL2, just do a Google search.

Anyway you'll be able to zoom in and out and what not. Take a screenshot when you get the overview positioned the way you are happy with. You also need values you'll get from the overview mode.

Put these values in a text file to be associated with your map name "dod_mapname.txt". Put the screenshot with the same naming standards "dod_mapname.bmp" and the text file into your DoD directory "overviews".

Here is a sample text file, comments use forward slashes.
// overview description file for dod_mapname.bsp
// Overview: Zoom 0.71, Map Origin (251.00, -66.00, 4.00), Z Min 3969.00, Z Max -829.00, Rotated 0

global
{
ZOOM 0.71
ORIGIN 251 -66 -829
ROTATED 0
}

layer
{
IMAGE "overviews/dod_mapname.bmp"
HEIGHT -829
}

http://developer.valvesoftware.com/wiki/Overviews

Thanks for the comments. I found that at the developer wiki but isn't it for source? Doesn't seem to work for 1.3 .

lol sorry, my bad

Well I figured out how to do overviews. One thing though, does anyone know how I can make one of a map with 2+ levels? I have a map that is almost entirely inside of one building and in the screenshot I take all you see is the roof. You really need to see the interior of the building. Any insight?

There is no way of doing that with dod, what you have to do is either do a compile with the rooves taken off so you can see inside or do as the offical overviews have which is replace the overview screenshot with a handdrawn/photoshoped image. So it looks like it's a dirty old map.

I believe it's your WASD keys combined with CTRL or Shift and you can zoom in and out as well as remove either from the bottom up of the map or the top down so you can see certain sections.

So in your case you'd keep removing the top layers until the top floor or whatever you want visible in the screen shot is showing.

With a bit of digging on old cds, I found the reference I originally used to create them. I hope this helps you.

Thanks but the attachment isn't a zip file. Can't read it. :(

I can read it, try downloading it again or use WinRAR!

add a .zip extension if you have to to the file. No problems here.

Ahhh ok just had to add the .zip on to it. Thx a bunch. Now I'll see if I can figure it out. :D