Glitches in assembling geometry

Questions
1

image

Hi there!
I am trying to load a sphere geometry exported in JSON format from Creo parametric.
I am just reading the vertices and faces from the file.
In some areas, I am finding that the geometry is not constructed well.
Please see the attached image.
I am not able to figure out the reason as it is as simple as setting the vertices and faces.
Any pointers would be greatly appreciated.
Thanks,
Prem VA

2

How is the mesh rendered if you set flatShading to true for the respective material.

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