How does Line Set Portal work?

[Trusty McLegit]

So I've been fooling around with linked portals in doom, but I don't quite understand how it all works. Would it be possible for someone to make like a mini guide as to how linked portals in zdoom? Like how they work, what they can and can't do, what the different portal types do, things you need to know when implementing them in maps, how to avoid bugs, etc. Thanks

[enderkevin13]

It's quite simple. Make sure it's not a impassable linedef, and make sure it's not a sector border of any sort. I can send you an example WAD if you need.

New portals.wad

Here's the WAS

(16.72 KiB) Downloaded 168 times

[Trusty McLegit]

Yeah, but sometimes when I make a portal, there are strange visual bugs if you look at it from certain angles. Is this because of something I did/it there a way around this, or is this because the feature isn't fully complete, or is this just something we're just going to have to live with?

Example:

---

[enderkevin13]

Yeah, but sometimes when I make a portal, there are strange visual bugs if you look at it from certain angles. Is this because of something I did/it there a way around this, or is this because the feature isn't fully complete, or is this just something we're just going to have to live with?

Example:

---

It's just a visual bug.

[Trusty McLegit]

Yeah, but how do I avoid it? Or is it something that's still being worked on? Because not all portals do that...

[enderkevin13]

Yeah, but how do I avoid it? Or is it something that's still being worked on? Because not all portals do that...

I don't think there's a way to avoid it. Try asking graf about it.

[AFADoomer]

Yeah, but how do I avoid it? Or is it something that's still being worked on? Because not all portals do that...

Upload a demo map that shows a reproducible version of this visual error so that others can see it and tell you if there's anything wrong with your configuration, and so that Graf has something to work from if it does turn out to be an engine-side issue.

[Trusty McLegit]

Here is a file showing it from two different angles. Also, I just tested it with the newest dev build of zdoom, and it seems to work fine, but the visual glitch still occurs in GZDooM. Also, does anybody know what the difference between the portal types do? I know it says on the wiki, but it doesn't really say specifically what the different types do (other than the visual only one).