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The Vector Math node has an operation called Normalize. I have always presumed that this is a monadic operator which ignores the second input and returns a unit vector in the direction of the input vector. This is also what poor said in this answer.

However, I was recently reading the manual and noticed that it says:

Normalize
Normalizing input 1 and 2.

Which is super-duper unhelpful. I have never known of a binary "normalize" operation (and couldn't find one in a quick Google search), so I don't know what "Normalizing input 1 and 2" means.

So what is going on here? Does it use the second input, if so how? Or is the manual just plain wrong?

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Input 2 is not used, manual is wrong, I guess. Links to the source code for the node are below, you can clearly see input 2 is never called when in normalize mode.

SVM: https://developer.blender.org/diffusion/B/browse/master/intern/cycles/kernel/svm/svm_math_util.h

OSL: https://developer.blender.org/diffusion/B/browse/master/intern/cycles/kernel/shaders/node_vector_math.osl

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