Robert Garrett
7926cd2b13
Got the enums to work. This match block is going to be absolutely massive, but whatever. Current materials are Lambertian and Metal.
50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
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use crate::vec3::Vec3;
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use crate::hittable::{
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Hittable,
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HitRecord,
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};
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use crate::material::Material;
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use crate::ray::Ray;
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pub struct Sphere{
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pub center: Vec3,
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pub radius: f32,
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pub material: Option<Material>,
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}
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impl Hittable for Sphere {
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fn hit(&self, r: Ray, t_min: f32, t_max: f32) -> Option<HitRecord>{
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let oc = r.orig - self.center;
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let a = r.dir.length_squared();
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let half_b = Vec3::dot(oc, r.dir);
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let c = oc.length_squared() - self.radius * self.radius;
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let discriminant = half_b*half_b - a*c;
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if discriminant < 0.0 {
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return None;
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}
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let sqrtd = discriminant.sqrt();
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// nearest root that lies within tolerance
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let root = (-half_b - sqrtd) / a;
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if root < t_min || root > t_max {
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let root = (-half_b + sqrtd) / a;
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if root < t_min || root > t_max {
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return None;
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}
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}
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let mut record = HitRecord{
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p: r.at(root),
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normal: (r.at(root) - self.center) / self.radius,
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material: self.material,
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t: root,
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front_face: false,
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};
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let outward_normal = (record.p - self.center) / self.radius;
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record.set_face_normal(r, outward_normal);
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Some(record)
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}
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}
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