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are just like other normals
- a 1 unit length
perpendicular, but since points in space can't have perpendicular line
- it has sense only when drawing a face
How do vertex normals work
Both images are THE SAME 2 triangles
from slightly different points of view.
Both images can be done with 6 pixels (the green and red one has same position in space, but different normals).
Left image: since the red and green normals are different - you can distinctly see how the color rapidly change from light green to darker one, but on the right image I have "merged" red and green normals (averaged them), therefore now you can't see the crease and the color changes smoothly - the normals are interpolated
and create a smooth