Hi RMA,
this is a very bad bug:
https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/e/3/e35c87789ca576bbe377917475239475f6a7ea7a.mp4 trimmed_picture.3dm (7.1 MB)
trimmed_picture.3dm (7.1 MB)
apparently been there for over a year now:
This works fine in my 6SR9 install:
Works fine in the 6.11 I have locally installed, as well as v7 WIP (it even doesn’t distort in the v6MacWIP on the crappy intel GPU).
What version are you currently at (_SystemInfo)? GPU driver up-to-date? GPU-tessellation on/off (I tested with both, looks good here).
Ooooh! I never even thought it could be a video card issue. I was thinking it would be mapping. I did this on the Surface Studio yesterday, I don’t use it much for Rhino so yeah, drivers have been neglected. I’ll upgrade vodka drivers and will report back.
Hmm, I probably should’ve tested also on the Intel and AMD GPUs. That will have to wait until Monday - my arms don’t reach all the way from home to office to change the cables 
And by vodka drivers I meant Nvidia drivers. I think autocorrect is already too excited for Friday.
Sure you meant…
Happy Weekend!
Please don’t be driving on Vodka, especially if you have new or upgraded drivers.
BTW this bug is back on a different machine running a Nvidia 1080ti with latest drivers.