Line between wall and attic wall

[JDorow]

I know this topic has been discussed many times before, but I have tried a number of things learned from previous posts to no avail. I have a SIP wall with a SIP attic wall above and for some reason it is displaying a line between the two on my elevations. As you scroll in and out, it will disappear and reappear. I cannot for the life of me figure out how to fix it! I am sure it is porbably something to do with not having the right combination of settings or something... Please help!

 

Wall Issue.zip

Edited May 23 by JDorow
Zip folder was empty

[Chrisb222]

24 minutes ago, JDorow said:

Swanson Addition.zip 214 B · 0 downloads

 

Your file is empty, probably because you had Chief open when you zipped it. Close Chief then zip/attach.

[DBCooper]

Here are a couple of reasons why this might happen.

 

- The walls are not aligned between floors.

- The wall types don't match.

- The materials for the walls are not the same.  And by the same, I mean the exact same material and not just two materials that look the same.

- The wall tops/bottom actually overlap.  This can happen when people edit them manually and can be reset back to default in the wall dialog.

 

[JDorow]

Fixed the empty .ZIP folder.

[Chrisb222]

3 hours ago, JDorow said:

As you scroll in and out, it will disappear and reappear.

 

I believe you're seeing "Z-fighting" - when underlying elements are competing for visibility - caused by your siding being only 1/2" thick, allowing other layer elements to show at the surface.

 

If you make the siding layer 1" it goes away, as seen in this before and after of the same exact view:

 

Before:

After:

 

I'm not suggesting you make your siding thicker, I'm just saying what's happening. I deal with it too.

 

 

[JDorow]

Chrisb222 - Thanks for the quick solution. I really should have my siding layer thicker, so that works great!

[SHCanada2]

On 5/23/2025 at 11:31 AM, Chrisb222 said:

I believe you're seeing "Z-fighting" - when underlying elements are competing for visibility - caused by your siding being only 1/2" thick

Not sure I understand this. When you refer to "underlying elements" are you referring to the sheathing beneath the siding? and if so why would this be competing as it is behind the siding? not doubting that it is, just wondering why it is. 

 

And if the siding should be 1" thick to avoid this, how does one get an accurate model as IRL siding is more like 5/8" (at least hardie board)? ...thin the sheathing to be 1/8?

[robdyck]

On 5/23/2025 at 8:08 AM, JDorow said:

As you scroll in and out, it will disappear and reappear.

I checked your plan and when I first generate a camera overview view the line was present. As soon as I scrolled in, it disappears and remains hidden, unless the camera is relatively far away. This telegraphing of lines at sharp angles or at distance in a camera view is normal. When I create a Section / Elevation view this line doesn't appear. Your walls are built and align correctly however I would recommend that you avoid painting siding materials wherever possible and instead set the desired cladding in the wall specification dialog.

[DBCooper]

z-fighting is what you get whenever you have two surfaces occupying the same space in a camera view.  In the picture below, I made two soffits that overlap and have different materials.  The program can't really figure out what material to use where the overlap happens so you get strange results.

 

 

 

 

I think something slightly different is going on in JDorow's plan.  I think the extra line is coming from the interior ceiling surface that is poking through to the outside of the wall.  I'm not really sure what is going on in this plan but if you look at that location from the inside, you will see some extra lines that shouldn't be there.   See picture below.

 

Making the siding thicker shouldn't be necessary but in this case, it helps to hide the real problem.

 

I thought it might be a problem with the wall type definition or room structure but I could not find anything that was obviously wrong.  Maybe someone else could poke around and see if they can spot the problem?  If no one does, you might want to submit a bug report to tech support and see what they have to say.  Everything might be right and the program is just getting confused (because sometimes it does this kind of thing).

 

 

 

 

[robdyck]

The extra lines at the interior wall corners (angled wall with door) are because all the wall materials have been painted. Merge 'Drift of Mist' and 'Drywall' and those lines will disappear.

Paint that material in Plan Mode with the default material.

[Rookie65]

I will see it in HD Pro as well sometimes. It can happen when walls are set to rebuild automatically. If you click on the wall in question, sometimes it will read as a "Polyline produced by 3D wall editor." The layers can build up, and you can delete them. When you get to the note that it is an auto generated wall, don't delete any more and see what it looks like. Sometimes that will take care of it. It could also be what the other folks posted, yet I wanted to offer this suggestion as well.

[robdyck]

These walls do not have default top / bottoms.

This will create unwanted lines when wall structures overlap. It can be difficult to find all the settings to model the building correctly so you can make a choice: Spend time finding / learning / adjusting those settings or make manual adjustments and then spend time cleaning up section & elevation views.

Split level homes are almost impossible to properly controll all wall elevations and intersections with default settings. Before I'd adjust the default wall heights, I'd add material regions or 3d solids to remove / cover unwanted wall layers.

 

 

[Chrisb222]

I still say this is Z fighting. You can even see it from the inside using a vector view. It's happening where the main wall and attic wall of the vaulted room meet. It disappears when you zoom in, and doesn't show in other view types.

 

Again, Z fighting like this will occur in vector views when you're some distance from the model. Zoom in and it goes away.

 

 

On 5/25/2025 at 9:37 PM, SHCanada2 said:

Not sure I understand this. When you refer to "underlying elements" are you referring to the sheathing beneath the siding?

 

Not sure what elements appear in every case, but yes, something under the siding.

 

On 5/25/2025 at 9:37 PM, SHCanada2 said:

and if so why would this be competing as it is behind the siding? not doubting that it is, just wondering why it is. 

 

Vector views are tasked with rendering the model using solid lines to outline the edges of objects and elements in the model. All of the objects in the model, whether seen or unseen, have lines drawn on their edges, but normally you just won't see them if they're covered by something else in front of them. My guess is that in this case, as the camera moves away from the model the siding thickness becomes minuscule in relation to the field of view, causing the software to "see" the siding and underlying elements as occupying the same planar surface. Or close enough to no longer render correctly.

 

On 5/25/2025 at 9:37 PM, SHCanada2 said:

And if the siding should be 1" thick to avoid this, how does one get an accurate model as IRL siding is more like 5/8" (at least hardie board)? ...thin the sheathing to be 1/8?

 

Right?  

 

[GaryOhmer]

Probably isn't correct but to get better vector view I balloon frame my SIP to eliminate the thick lines.