'unjoin' sectors

[Cybermaarten]

Hi there. I've been joining sectors. Is there a way to undo this? So to say "unjoin" two sectors, who do not share vertices? Thanks!

[CodeImp]

Draw over one part of your sector and that part will become a new sector.

[Cybermaarten]

I'm still experiencing trouble with this. Say I have 2 sectors joined, 1A and 1B. Now I want to unjoin them. According to CodeImp, I should draw a line through 1A, which splits sector 1A into 1A and 2. Say I only want to keep 1B and 2. How do I get rid of 1A? Selecting all linedefs of 1A except the line between 1A and 2? Won't that result in errors?

Another problem is that when I split a sector, it's rather unpredictable which part of the split sector stays part of the joined sector, and which part becomes a new sector... I tried drawing the linedefs from left to right and from right to left, but that doesn't always work. Is there a good workaround for this?

Two nice features that would solve all of my problems, would be:
- If I rightclick 1A I should have a button "unjoin sector". When I choose it, the sector would get the first available sector number. So when I have joined sectors 1A, 1B and 1C, and "unjoin" 1A, I get sectors 1B, 1C and 2 (1B and 1C still being one joined sector).
- If I draw a linedef through 1A, so I split it, it should result in 2 totally new, unjoined sectors. So say I have sectors 1A and 1B, and split 1A, I get sectors 1B, 2 and 3. I can easily join 1B and 2 again, if I wanted that.

Just trying to add something to the already great app!

[CodeImp]

I'm still experiencing trouble with this. Say I have 2 sectors joined, 1A and 1B. Now I want to unjoin them. According to CodeImp, I should draw a line through 1A, which splits sector 1A into 1A and 2. Say I only want to keep 1B and 2.

Either you don't understand or you can't explain it :P
When you join sectors 1A and 1B together, all you have is sector 1 (no A or B, they have become one) So when you split them, it really doesn't matter if it was 1A or 1B,... it will become 1 and 2, according to your terminology.

Yea the sector splitting (with unclosed split line only) does have a little bit of unpredictable result when the sector is complex (multiple islands). But when you split a sector by completely drawing over the part you want to become a new sector, there is no such problems.

In Doom Builder 2 there will be a Make Sector feature which makes it also simple to seperate islands from one sector. I'm also thinking about a quick-split feature which allows you to draw one line, not connected to anything, just a random line across your map, and it will split the sector into whats on the left of the line and whats on the right of it.

[Cybermaarten]

Ok I've done some little testing, and it seems I finally understand how it works. Thanks for the tips CodeImp :).

I've been working a lot with DukeBuild in the past, and stuff like redrawing a sector (drawing a new sector on top of an old one) was just not accepted there. It resulted in various exotic errors. Seem DoomBuilder is a little more forgiving than that.

Still, an "unjoin" button might be cool :P

[esselfortium]

Cybermaarten said:

Still, an "unjoin" button might be cool :P

Slade 2 has this :P

[CodeImp]

Unjoin Sector? Since it is only one sector I don't see how a machine can split it properly completely automated. There is no information whatsoever that indicates where it should be splitten to 'unjoin'. The only thing I can think of is splitting an island from a sector, but that is exactly the same as using a Make Sector function on the island, splitting it off from the whole sector. Care to elaborate on your 'Unjoin Sector' idea?