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use crate::core::{Vector3f, Bound3f, Ray};
use crate::Float;
use crate::material::Material;
/// Returns the context of a intersection
pub struct Intersection<'a> {
/// Normal vector at intersection
pub n: Vector3f,
pub p: Vector3f,
pub front: bool,
pub t: Float,
pub m: Option<&'a dyn Material>,
}
impl<'a> Intersection<'a> {
pub fn new(out_normal: Vector3f, point: Vector3f, ray: &Ray, t: Float) -> Self {
let front = ray.direction.dot(&out_normal) < 0.0;
Intersection {
n: { if front { out_normal } else { -out_normal } },
front,
p: point,
m: None,
t,
}
}
pub fn add_material_if_none(&mut self, mat: &'a dyn Material) {
if let None = self.m {
self.m = Some(mat);
}
}
}
/// Defines a common trait for objects in the scene
pub trait Hittable: Sync + Send {
/// Returns the intersection with ray
fn intersect(&self, ray: &Ray) -> Option<Intersection>;
/// Returns the axis alligned bounding box containing self
fn bounding_box(&self) -> Bound3f;
}
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