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use crate::Float;
use crate::core::{Ray, Spectrum, Vector3f};
use crate::world::Intersection;
use super::Material;
use crate::sample::Sampler;
pub struct Reflectant {
color: Spectrum,
fuzz: Option<Float>,
}
impl Reflectant {
pub fn new(c: Spectrum, fuzz: Option<Float>) -> Reflectant {
Reflectant {
color: c,
fuzz,
}
}
}
fn reflect(v: &Vector3f, n: &Vector3f) -> Vector3f {
*v - *n * (2.0 * v.dot(n))
}
impl Material for Reflectant {
fn scatter(&self, ray: &Ray, i: &Intersection, sampler: &mut dyn Sampler) -> Option<(Spectrum, Ray)> {
// Find reflectance vector
let mut reflected = reflect(&ray.direction, &i.n);
if let Some(fuzz) = self.fuzz {
reflected += &(sampler.get_unit_vector() * fuzz);
}
Some((
self.color,
Ray::new(i.p, reflected.norm()),
))
}
}
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