How to use "updateNormals and VertexNormals"?

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Happy Sammy
 #1
Hi all,

"updateNormals": according to help manual...
Recalculates all normals in a mesh. This is necessary
for correct lighting if you have not set surface normals
using 'VertexNormals' commands


When I do lighting in gile[s], I haven't used these
2 commands. Are they important?

Thanks in advance
Sammy
:)