BufferAttribute has a normalize() function
I don’t understand how it works - normalize (); What is it for? I read Unit vector - Wikipedia but didn’t understand everything 
Can you please show in the code where this method is defined?
Some vectors require unit length. Normalization is the mathematical process that ensures this property.
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(In super simple way - it just makes vector.length() equal to 1 by scaling x/y/z equally. “Unit vector” = “vector of length 1”.)
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That’s what happens internally: three.js/Vector3.js at cf04fca253477f40e04488229cfcaf0f280e448b · mrdoob/three.js · GitHub
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