Question about per-corner normals about computer-graphics-meshes

[songfeil]

I have the same question with the dot product,
For the second question, the header file shows that the corner_threshold are given in degrees. So I'm wondering if it means that if the degree between the two normals are bigger than, say 20 degrees, then we don't add the normal.

[nafis95]

I have a similar question regarding the dot product. Does it matter which face normal you take to compare? For example, if v1 has face f1,f2,f3 and f4, do you take f1 as the benchmark and dot product the rest with f1 to ensure its below the threshold? Like I am a bit confused about exactly which 2 normals to compare and which to reject

[songfeil]

@nafis95 I think it involves with which face you're currently look at.
Say v1 has face f1, f2, f3. Then for the v1 corner in face f1, compare with the normal of f1. For the corner in face f2 compare with the normal of f2.