[Solved] what does the concept of using dot product and < do in the following code?

Question

If both vectors are normalized (i.e. their lengths equal 1) the dot product returns the cosine of the angle between them (range is -1..+1). So the operator effectively returns whether the vector of the first vertex has a larger angle to the direction vector than the vector of the second vertex.

Accepted Answer

If both vectors are normalized (i.e. their lengths equal 1) the dot product returns the cosine of the angle between them (range is -1..+1). So the operator effectively returns whether the vector of the first vertex has a larger angle to the direction vector than the vector of the second vertex.