Edit zoommaps.dat

[tedomedo]

Can someone create something to open zoommaps.dat in order to delete some local worlds? I want to keep 4 local worlds (my home and 3 traps) and delete other local worlds which i don't need.

[davidor]

Technically you can just manually wipe the file clean and only keeping data chunks of the location that you want to keep. you also don't want to do it with settlements. Most other places should respawn once you zoom in.

[tedomedo]

I know well how to keep only one. But i want to keep 3 of them and delete other.

[davidor]

Now you confused me. How come you know the way to keep only one? If you can keep one part you shouldn't have problem keeping others and delete all unwanted maps.

[tedomedo]

Read "Playing with urw files" in wikia.  You go to a local terrain, don't save the game, go to save folder and delete all three zoom' files.

[davidor]

*facepalm*

Go use a hex editor and open ZOOMMAPS.DAT, each data chunk is 88392 bytes. Just keep those you want + visited settlements and delete others.
You also need to delete related data in ZOOMINDEX.DAT. Deleting visited settlements will create new villagers on next visit but may have unknown consequences.

[tedomedo]

Each known local terrain is big about 4 mb.
How can i see in hex editor which local terrains are those which i want to keep?

[davidor]

record all the co-ordanates for places you want to keep by reading msglog
and here is the file structure of ZOOMMAPS.DAT

Spoiler: show

5. open ZOOMMAPS.DAT
6. search for that number
7. the structure of this file is
first 8 bytes global location <<< the same thing in msglog
next 4096 for buildings
next 4096 discovered
next 4096 terrain
next 4096 steepness
next 72000 things

EDIT: Just delete them for every single location you want to reset, or you just search for the place you want to keep and make a new file to replace the old one. Think it as binding a new book with few pages from an old one.
you also should delete locations in ZOOMINDEX.DAT

[tedomedo]

Let's try with example.
 I went to a local terrain now and signs for this zooming in msglog.txt are: (143270):g9hg:

• {0238060D}

What to find in zoommaps.dat with hex editor?

[davidor]

380200000d060000

[tedomedo]

Yes, i found this in zoommaps.dat. New step?

[davidor]

you should have all info in this post now. it is just simple copy and delete stuffs. try explore by yourself.

[tedomedo]

I still don't know what to do. Your posts aren't guide for someone who doesn't know hex things.
If 380200000d060000 is start of a local terrain, where is end of it? How can i calculate to get 380200000d060000 from 0238060D?

[tedomedo]

Still no answer...