(2024-01-31, 22:05)Magnus Forsberg Wrote: I would say it is flat, but the geometry could be improved. The angle of the bottom front surface is not right.
While the rendering looks wrong, I don't think it's due to incorrect LDraw part geometry. As Magnus points out, the real helmet really isn't flat, and I'm pretty sure this is visible in your photo:
The red arrow I added certainly appears to point at the spot on the helmet where it changes from spherical to cylindrical. Notice how the apparently linear features in the reflection change direction at that spot.