Function rs_pbrt::core::geometry::nrm_dot_vec3f

pub fn nrm_dot_vec3f(n1: &Normal3f, v2: &Vector3f) -> Float

Product of the Euclidean magnitudes of a normal (and a vector) and the cosine of the angle between them. A return value of zero means both are orthogonal, a value if one means they are codirectional.