Hi Alex,
I have been working with Pete on this issue. We wanted to understand why antialiasing works in the Swiss Army Knife example and not in our projects.
We found that this issue is not unique to the iPad. It is a general issue with Safari. You can reproduce the issue on macOS or iOS as long as you are using Safari.
We found that the difference between the Swiss Army knife project and our projects was HDR rendering. The knife example had HDR enabled. Our projects had HDR disabled.
Once we enabled HDR in Blender and re-exported the GLTF, antialiasing worked.
I used the knife models to create two test cases. One with HDR enabled and the other with HDR disabled. Please use Safari to view each of these links:
Disabled
Enabled
I preformed these tests on a fully updated Mac, Verge 3.61, and Blender 2.92. I have attached the two v3d project files to this post.
Is this expected behavior? If so, is there a cost to enabling HDR on all projects? Thank you.