I don’t know how to bend this glass without creating obvious cracks like this here, is there a way to make it seamless?
You could try unioning the different pieces.
Might try using skinned meshes like S15 uses to cover the joints
Have you used GapFill? Try using a normal part instead, also union it or make a mesh
Unioning is performance wise, just use gapfill.
GapFill will still create seams on the corners, and unioning may cause weird collision behavior and performance issues. I would recommend using the glass material, as it is meant to be used for situations like these.