Misalignment of room lines and grey backdrop in the model editor

alterleon · January 28, 2025, 1:48am

Hi community,
I have trouble with the visualization of my revit-exported snapshot in the model editor. The red room lines are not aligned with the grey 2D rendering that is usually a backdrop for the rooms. I tried to re-export the snapshot but the problems is persistent. I have no shades exported.
This seems to be a bug.

The visual 3D rendering shows me a great-looking model. But I am uncertain if this misalignment will create problems down the line, so I stopped editing it.

Strangely, I didn’t notice this problem last week. But now, I can’t find a way to resolve it. Any ideas?

Link to the video

Image of the disaligned room lines next to the grey rendering

Screenshot of the error message that Revit shows before I open the export pollination feature. Relevant?

mostapha · January 28, 2025, 2:13am

Hi @alterleon,

This is a bug that was introduced in the technology that we use to build the Model Editor. Someone reported it during the weekend:

github.com/tldraw/tldraw

[Bug]: Misaligned handles on chromium-based browsers with fractional scale on wayland

opened 11:44PM - 25 Jan 25 UTC

phisch

bug

### What happened? Grab handles on tldraw are misaligned on all chromium-based …browsers (chrome, chromium, edge and more) on wayland with fractional scaling. It works fine on firefox. And it also works fine in chromium-based browsers when fractional scaling is set to `1.0` Here is an example with a fractional scale of `1.5`: https://github.com/user-attachments/assets/95b611d0-433e-4753-90f7-e8b8f4080bf3 This happens on niri (smithay based wayland compositor). But I assume this would happen on other wayland compositors with fractional scaling as well. I am not sure if tldraw can do anything to fix that, since I assume this is a browser bug. But I'd like to at least open this issue so people can find it, and I'd close it once this isn't an issue anymore. ### How can we reproduce the bug? Setup linux with for example [niri](https://github.com/YaLTeR/niri), and chromium, set niris fractional scale to anything above 1, for example `1.5` and visit/use tldraw.com. ### What browsers are you seeing the problem on? Chrome, Microsoft Edge ### Where did this happen? The tldraw.com website ### Contact Details _No response_ ### Code of Conduct - [x] I agree to follow this project's Code of Conduct

A couple of users also reported it to us today, and we tried to push a fix which did fix the issue. Now that you reported this, I did another check, and I can see that I get the same error. Let me revert the change on my end and see how it affects the problem.

FYI, and as you can see in the link that I shared above this is only a visualization issue. Your geometry is still correct.

mostapha · January 28, 2025, 2:59am

Hi again, @alterleon,

I tried several approaches, but I wasn’t able to fix the issue. I emailed the tldraw team and also documented the issue for @antonellodinunzio.

Since this issue is limited to Chromium-based browsers, our backup plan is to expose the import functionality in the browser so you can open the Model Editor inside Firefox and edit your models.

I know this bug make the Mode Edito almost useless, and I wish I could come up with a fix, but we will need some help from the tldraw team to fix this one. I’m really sorry! I’ll try one more idea but it’s unlikely that I can fix it tonight.

mostapha · January 28, 2025, 3:01am

Hi Antonello. Let’s see if the tldraw team can help with this. Otherwise, we should expose the option to open the files in the browser so people can export their models as DFJSON and edit it in Firefox until this issue is fixed. Thanks.

mostapha · January 28, 2025, 3:56pm

@alterleon, this should be fixed now. Can you try to right-click on the top band and select refresh? Or simply press Ctrl+R to reload the Model Editor?

Let us know how it goes.

alterleon · January 28, 2025, 4:47pm

hi @mostapha,
this is fixed now! I didn’t have to do reload anything. Seems to work fine.
Thank you so much for the speedy recovery. I hope you didn’t have stay up all night to fix this.