Original Post — Direct link
sometimes in the game when a round start there will be multiple polygons appear in the map blocking my sight. They are completely random but most of them are slanting, and they will disappear and reappear if you change the direction of your sight. There's no telling when this will happen, but once it does, it can't be fixed by changing graphic setting in game. Sometimes this issue disappeared in the next game(not round), sometimes I have to restart Rainbow six.

Windows 10 Home 64-bit (10.0, Build 19041) (19041.vb_release.191206-1406)
Processor: 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz (8 CPUs), ~2.4GHz
Memory: 16384MB RAM
Graphic card: Intel(R) Iris(R) Xe Graphics

20 days ago - UbiKoality - Direct link
Hi paradox_L! First, I deeply apologize for the annoyance or inconvenience that this bug in Rainbow Six Siege may have caused you. Second, thank you so much for taking the time to not only write this post and get this reported, but to include details of the problem and screenshots! This kind of information is extremely helpful when investigating bugs, so I really appreciate your help. Moving forward, I'd suggest verifying the game's files in Steam for starters. Doing so will replace any missing or corrupted game files that could be causing this problem, then ensure that everything required for the game is installed correctly on your system. I'd also advise running the game as an administrator to see if that makes any differences with this problem.

Ultimately, if none of these suggestions help, please don't hesitate to upload your MSinfo and DxDiag files in a case at support.ubi.com. From there, our technical team will be able to provide more specialized assistance with this and ensure that it gets reported to the relevant teams. You can let me know your case number once it has been created. Thank you!

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How To Submit Dxdiag and MSinfo Files
How To Submit Dxdiag and MSinfo Files

Run applications with administrator rights
How do I run programs with administrator rights?

Verify Integrity of Game Files - How To's - Knowledge Base - Steam Support
Article "Verify Integrity of Game Files"

Steam Community :: Screenshot
Steam Community: Tom Clancy's Rainbow Six Siege.

Steam Community :: Screenshot
Steam Community: Tom Clancy's Rainbow Six Siege.