wip: parallelization

src/objects/circle.rs

@@ -0,0 +1,52 @@
+use std::sync::Arc;
+
+use crate::{
+    objects::{materials::traits::Material, traits::Hittable},
+    ray::Ray,
+    vec3::Vec3,
+};
+
+use super::hit::Hit;
+
+#[derive(Debug)]
+pub struct Circle {
+    radius: f32,
+    center: Vec3,
+    normal: Vec3,
+    material: Arc<dyn Material>,
+}
+
+impl Circle {
+    pub fn new(radius: f32, center: Vec3, normal: Vec3, material: Arc<dyn Material>) -> Self {
+        Self {
+            radius,
+            center,
+            normal: normal.get_unit(),
+            material,
+        }
+    }
+}
+
+impl Hittable for Circle {
+    fn hit(&self, r: &Ray) -> Option<Hit> {
+        // check if ray parallel to plane
+        let dot = self.normal.dot(r.dir());
+        if dot == 0.0 {
+            return None;
+        }
+
+        // hitpoint on plane
+        let t = self.normal.dot(&(self.center - r.origin())) / dot;
+
+        // hits behind camera
+        if t < 0. {
+            return None;
+        };
+
+        let p = r.at(t);
+        if (p - self.center).length() < self.radius {
+            return Some(Hit::new(t, p, self.normal, self.material.clone(), self.normal.dot(&r.dir()) < 0.)); 
+        }
+        None
+    }
+}