The sign of the dot product based on the angle between V and N:
less than 90: positive
exactly 90: zero
greater than 90: negative
This is based on the cosine formula for the dot product.
The sign of the dot product based on the angle between V and N:
less than 90: positive
exactly 90: zero
greater than 90: negative
This is based on the cosine formula for the dot product.