engine_web-ifc [Bug]: Incorrect geometry generated (triangle sticking out)

What happened?

I found an IFC file that causes the webifc engine to produce incorrect geometry (no other viewers I’ve tried do that).

Version

0.72

What browsers are you seeing the problem on?

No response

Relevant log output

Anything else?

Not related to browser

Oct 29 '25 09:10 mezlondr

File privately available here.

Oct 31 '25 18:10 agviegas

Seems to be solved

Can test it here -> https://thatopen.github.io/engine_web-ifc/demo

Nov 07 '25 13:11 QuimMoya

@QuimMoya Yes, the triangle seems to be gone, but now there appeared a new triangle that is sticking out from the roof. I will try to isolate it and I'll send an ifc via e-mail to you (probably tomorrow or soon-ish).

Nov 10 '25 06:11 mezlondr

I've sent the problematic IFC file to Antonio, I was unfortunately not able to isolate the individual broken parts.

Nov 11 '25 07:11 mezlondr

Second model privately uploaded here.

Nov 11 '25 10:11 agviegas

I've noticed this problem could be related to #1665 (which seems to be actually not rendering issue but geometry generation issue), I can reproduce the triangle issue with my own renderer, if it's the same or related issue their model might be easier to debug as it's smaller. Hope it helps.

Dec 01 '25 11:12 mezlondr

It seems that solving the issue #1665 has partially fixed some problems in this model.

Dec 10 '25 09:12 QuimMoya