I have spent days searching for this problem's solution and found nothing.
or, actually I did find a thread posted here about the same issue. And as I see from the screeshots it got solved. Problem is I ONLY SEE THE SCREENSHOTS.
The thread is not openable, so I am left without the explenation how to solve this issue.

I have seen countless tutorials, and even the advanced building tutorials I understand, and I'm ready to make beautiful attics, skylights and sloped roofs. But everytime I try an ugly polygon glitch ruins my work. Sloped ceiling tiles (no matter what kind, the basic, downloaded, transparent) brake and have diamond shaped holes in them with the texture facing the other direction.

Now, if I delete the ceiling tiles with Ctrl+Shift, and then undo that, they do reappear normally without this glitch. But problem is that this is temporary, the next time I open the lot it's messed up again.

So is there a reason why my game does this? Anybody has any idea what I have to do so my ceiling become as beautiful as in those tutorials?
Thanks

[UPDATE:03.09.2014]

Thank you everyone for your responses, you all helped me a lot to understand this issue, and understanding it is the first step to solve it.

I see that this is not a graphical error, it's the game. I see now, that the ceiling in Sims 2 is a different mesh than the Floor above it, and it can't follow the way it bends.
After finding out that the problem is not with my game, and others also suffer from it, I understood that we need to solve this problem with modding.

As I was looking for solution, I stubled into a thread discussing ceiling visibily.
Thanks to @Shell Villa, I got an idea to, not exactly solving, but going around our ceiling glitch problem. Here is what you gotta do.

As I said, the ceiling is a different mesh than the floor above it. Some modders created Double-sided floor tiles for different purpose, but it will solve our problem pretty nicely.
Here are a few double-side floor tiles that you might need:
http://www.thesimsresource.com/arti...iles/id/372474/
http://www.modthesims.info/download.php?t=211418
http://www.thesimsresource.com/arti...vies/id/653617/

You also should consider downloading the invisible floor tile, you might need it later:
http://modthesims.info/d/166311

Now you have to do the following:
1, Create a "fake" floor that is going to be our roof


2, Select any double sided tile that you like and cover your roof with it


I also test the creation of skylights with the double sided glass tile here



3, Go down to an angle you see the ceiling that got automatically created, and with pressing shift fill up the ceiling with the invisible floor tile

Now we should see something like this:


Without this step is we slope the ceiling with the "constrainFloorElevation false" cheat we will see something like this.

It still looks nice if we disable the ceiling but, why should we be okay with that if our ceiling could be beautiful all the time, right? So before sloping, remember to turn the ceiling invisible, with the invisible floor tile, since sloped ceiling tiles can not be selected to repaint afrerwards.

4, Use the "constrainFloorElevation false" cheat to slope the ceiling anyway you like to create awesome skylights, attics, bridges and anything else, without that annyoing ceiling glitch!


Hope you all will take a good use of this idea. It's not a flawless solution, but it's a good alternative for sloped ceiling tiles where you need them!

With kind regards,
Robert

I wish I had the answer! I've struggled with this "glitch" too...

Can't anyone shed some light on this?

Are you trying to use actual ceiling tiles or just flooring tiles as a ceiling? That might be part of it.

I have a CFE'd roof that looks the same way, so it is not something peculiar to your game alone. I have also seen it on other occasions after CFE'ing.

Regarding my roof, it depends on the angle from which it is viewed. From below or from about the same level, it looks like this:



But if I move the camera to above, it looks normal:



I don't think the type of floor tiles has anything to do with it. It's the CFE that causes this. I'm not particularly bothered by my roof, but that's just me.
There are tutorials on how to make the type of walls/roof you're doing, which might help you resolve the issue, but due to the scatterbrained, anally retentive, paranoid schizophrenic way this site is "organized", I'm unable to find them at this time. They're there though, I just read one the other day.

Thanks for the answers, well at least I'm not alone with this.

Do you guys have ATI videocards? I have, and I heard ATI cards have a lot of problems with Sims2. I was not sure that some hardware problem could cause such glitch, but I'm starting to get suspicious.

The ceiling looks like this, even if I don't modify it with anything (the basic game ceiling time). and if I try to cover it with floor tiles.
@ScaryRob
Yes, that's exactly how my CFE roofs look like too, after I finish them.
I have read a lot of tutorialsabout attics, or skylights with CFE. But even if I follow every step the result is this glitch, and It makes me feel my work... imperfect.

Yes, mine is an ATI Radeon 4850, but I kind of doubt that is the issue.

If there is a way to resolve this, I think it might have something to do with the way CFE was used to make the roof.
I made mine by using a "scaffold" next to the house and lowering the roof, row by row, starting at the centerline and working my way out to the edges. Another way to do it would be the opposite, by raising the roof, row by row, starting from the outer edges of the roof and working inward toward the centerline. It's possible this might make a difference.
Actually, I've got my game running, so let me try it. Be back in a bit.

OK, back. The manner of CFE didn't make a difference. I didn't think it would.
I made a mini version of my house, but this time CFE'd the roof by raising the ground, like this:



which made no difference:



It may be a normal result and not be a solvable issue, although you're right about some of the tutorials apparently showing a nice result.
Can you give me the links to the tutorials you've found? Also a link to the thread without the text?
I will have to leave now, but I'll look at this again later tonight or tomorrow.

ps- I also played around with the setting on my ATI card, which made no difference. My card is mostly set to accept whatever the application wants that I happen to be running, in this case TS2.

I'm on Nvidia G-something or other.... I have tried every way of CFE-ing roofs - (Every way I can think of, anyway ) The ceiling always splits into diamonds. Aggravating. But, I've resigned myself to it.
If someone finds the secret - I will be super-duper pleased!

I think its the Apartment life ceilings - try toggling ceilings off. The "nice looking results" maybe were not built with Apartment Life?

I've suffered from this conundrum since Seasons. *sigh*

That is just what CFE does, isn't it? Are people saying it doesn't create diamonds/triangles for everyone?

This is one reason I don't use CFE very much as I dislike the triangles it forms when you toggle ceilings on. The lot I am working on has an archway into a pool area and the triangles are there, but I made it a little flatter to make less of them.

I have the SimVille neighborhood downloaded from MTS, and one of the lots it shipped with had this problem. I'm guessing the hood was made without Apartment Life, so the creators probably didn't know about this debacle. Since I'm not good with CFE, I usually toggle the ceiling off or just try my best to ignore the full-of-holes ceiling.

No, it's not the video card. I get this with CFE'd roofs too. I originally had a Radeon but it shows up with the current NVidia too. The issue is to do with bending the roofs in a way not intended by the game. I've never found a solution but then I've never looked either. I'd be interested in someone does know how to solve it. The spire on St Chisholms in Sirencester has a positive crown on it if I don't turn off the ceilings when I go there.

Ceilings only came with apartment life so this couldn't have been a problem before then. Also all "ceiling tiles" are floor tiles as considered by the game, there is no distinction.

I don't think this is fixable either. It's a shame but you have to choose - pretty ceilings without CFE rooves, or turn ceilings off when screenshotting/looking at that area.

I wonder if you could do a dummy level above, delete the walls, use invisible/hider floor tiles on top and just the ceiling on the bottom? It would look weird when it snowed, though.

Sorry - I must point out an incorrectitude... Floor-tiles and ceilings are the same - and so, back in 'Seasons' when I tried to build a sloped skylight using CFE, the floor/ceiling split into diamonds. This has been a problem long before AL.

I'd really like to know where the second picture @HegeRobert posted in the OP came from. How in the world did they do that? It is S2, right? Not S3?

It is Sims 2 and I too could take such screenshots. Like I mentioned in the original post, if I press ctrl+shift to delete ALL the ceiling tiles in the room, and then UNDO this delete, the ceiling tiles will reappear without this glitch. But this is only temporary. Next time you enter the lot, you will find the sloped ceiling broken into diamond again.

Ahhhh - thanks for clarifying for me. I'll have to try that trick next time I'm taking screenies Have you tried using the Attic Build items? There are some at BPS - I don't have a link right now, I think they are made by Impish Parody??? They will mask the problem. Which might be the best solution...

Here's the link: http://www.blackpearlsims.com/downl...do=file&id=1787

I can't get Ctrl+Shift to even delete all the floor/ceiling tiles, but that's probably a User Error of some sort. But in any case, if this temporary solution actually "sticks" for the entire play session, then I would think that's a pretty good fix.

I am 100% sure that ceilings did not come with seasons. I had just uni, bg and seasons for a really long time and never had ceilings then. Before this if you looked upwards underneath floor tiles (using camera mode for example) they just disappeared and you could see the sky.

Ctrl-Shift you need to hold and then click. That will delete all floor tiles in an area, either the whole room or the whole set of matching floor tiles. It should work for ceilings since they are just floor tiles, applied to the underside of other floor tiles.

Sims wiki agrees with me that they were added in AL: http://sims.wikia.com/wiki/Ceiling

The skylight tutorials may have been made for an older expansion and were just for looks on the outside rather than inside.

Thank you everyone for your responses, you all helped me a lot to understand this issue, and understanding it is the first step to solve it.

I see that this is not a graphical error, it's the game. I see now, that the ceiling in Sims 2 is a different mesh than the Floor above it, and it can't follow the way it bends.
After finding out that the problem is not with my game, and others also suffer from it, I understood that we need to solve this problem with modding.

As I was looking for solution, I stubled into a thread discussing ceiling visibily.
Thanks to @Shell Villa, I got an idea to, not exactly solving, but going around our ceiling glitch problem. Here is what you gotta do.

As I said, the ceiling is a different mesh than the floor above it. Some modders created Double-sided floor tiles for different purpose, but it will solve our problem pretty nicely.
Here are a few double-side floor tiles that you might need:
http://www.thesimsresource.com/arti...iles/id/372474/
http://www.modthesims.info/download.php?t=211418
http://www.thesimsresource.com/arti...vies/id/653617/

You also should consider downloading the invisible floor tile, you might need it later:
http://modthesims.info/d/166311

Now you have to do the following:
1, Create a "fake" floor that is going to be our roof


2, Select any double sided tile that you like and cover your roof with it


I also test the creation of skylights with the double sided glass tile here



3, Go down to an angle you see the ceiling that got automatically created, and with pressing shift fill up the ceiling with the invisible floor tile

Now we should see something like this:


Without this step is we slope the ceiling with the "constrainFloorElevation false" cheat we will see something like this.

It still looks nice if we disable the ceiling but, why should we be okay with that if our ceiling could be beautiful all the time, right? So before sloping, remember to turn the ceiling invisible, with the invisible floor tile, since sloped ceiling tiles can not be selected to repaint afrerwards.

4, Use the "constrainFloorElevation false" cheat to slope the ceiling anyway you like to create awesome skylights, attics, bridges and anything else, without that annyoing ceiling glitch!


Hope you all will take a good use of this idea. It's not a flawless solution, but it's a good alternative for sloped ceiling tiles where you need them!

With kind regards,
Robert

A solution!!! YAY!
So, it IS the ceiling and not the floor that get split! If you use the double-sided floor for a roof, and an invisi-ceiling inside - no diamonds?! I gotta try this Thanks!

This is great! I had no idea that double sided floor tiles even existed before.

I'm really glad that we could help eachother! I just finished my first house where I used our new trick!
I'm looking forward to see your creatons with sloped ceiling!

Very interesting, thanks hegeRobert. I hadn't heard of double sided floor tiles either. I can see a rash of CFE buildings coming from this.

LOL! You did all the work "We" just sat around and said it wouldn't work...

Your new creation looks splendiferous! I have a modern-esque house that I was about to upload that will benefit greatly from this solution. I just gotta get in and re-take some pictures! (...and right now I have some 'new' files that are causing borkage - so I have to search them out first )

Excellent post - thanks for that. You might consider putting that in the tutorials section.