Help with weird map glitch.

[Kyka]

So as the thread title suggests, I am having a weird map issue. In one of the maps for TNT Forever, I have been editing it for the last couple of weeks, and in the last few days I have been getting a strange effect in the map. There is an invisible wall running across an open area. This wall blocks both monster and player projectiles, as you can see from these screenshots.

 

Player: (Projectiles)

 

Monster: (The monsters can still see you and fire at you through this invisible wall, though it does block their projectile attacks. )

 

Hitscan weapons pass right through this invisible barrier. (You can see the black marks on the distant wall):

 

The really weird thing is that there is no linedef in the area where the blocking 'line' is situated. There is nothing there except this invisible barrier.

 

Any thoughts/ideas/solutions as to fix this would be appreciated.

 

Cheers.

 

 

 

[Mr.Rocket]

The line that's directly in front of the player looks to be one of the lines of the sector.

It's possible that the sector isn't closed which would explain why some projectiles go threw it and some don't.

Post the map up and I'll take a look.

 

 

[Kyka]

In that screenie, I am pushing right up against the blocking line, so where the player is, that is where the blocking area is. There is definitely no line where the blocking 'line' is. And according to GZDB, there aren't any unclosed sectors, missing linedef sector references etc etc. I don't know what the problem is. :)

 

I won't post the map publicly, as it is from a forthcoming project, but I will PM you with it. Thank you for taking a look at it. :)

[Mr.Rocket]

No problem, sure, PM it over. ;)

[Kyka]

Sent. :)

 

[SilverMiner]

Try dividing the sector in 2 and make them differ in brightness (like 176 and 175)

It could help

[Teo Slayer]

Em dude, for some reason I see missing textures on your screenshots.

[P41R47]

8 minutes ago, Teo Slayer said:

Em dude, for some reason I see missing textures on your screenshots.

its not a finished map, its normal that somethings are not there.
We use a placeholder texture for more conservative ports.

[Kyka]

Ok. Thanks to @Mr.Rocket for the solution. I sent him the map (w/ texture pack,) and he played around with it for a bit. His solution was as follows.

 

(This is a direct quote from his reply pm.)

 

---------------------------------------------------------------------------------------------------------------------------------------------------------------

[pm start]

"Ok here ya go:

 

And see if that fixes it.

 

The way I noticed it is I noclipped over to that area, and while I was in noclip mode that invisible line lifted my player up to the floor height of the given sector floor height shown above. The only real thing I noticed different about the sectors was the ceiling was different than the surrounding sectors. Once I changed the ceiling height to be the same as the other connected sectors (-108 ceiling height), the issue issue went away."

[pm end]

---------------------------------------------------------------------------------------------------------------------------------------------------------------

This fixed the issue for me, but on another nodebuild, it didn't work. Encouraging stuff at least. (If I put the P1 start near the error, which I did to save me running through the whole map to get there, there was no blocking invisible wall, but if I ran from the start of the level, the blocking line reappeared. Go figure. This happened several times. No idea why.) So in addition to doing this, I also widened several of the one-pixel-wide sectors between the raised rocky area to the left and the main grassy area in the centre. (You can just see them in the two screenies above.) This finally fixed the problem on several run throughs.

 

So it seems it was some nodebuild/blockmap error perhaps? I am hardly an expert in such things, but glad to have a solution.

 

@SilverMiner thanks for your suggestion. If Mr.Rocket's suggestion had not worked, this would have been my next attempt. And I will keep it in mind for future reference. 

 

@Teo Slayer As P41R47 pointed out, it is not finished. I am using a finalised older version of the current texture pack too, which doesn't have these particular textures in it, which I am using until we finish the current version.

Edited October 3, 2021 by Kyka

[The_SloVinator]

I think I remember having a similar yet different issue on one of the project contributions I made earlier this year.

Basically, I could walk through the area normally but the bullets at one specific spot would hit an invisible wall. You could see the bullet puffs in the air.

I still don't know what it was.

I think projectiles behaved normally.

 

Really bizarre.