Added scene, raytracer, pixel display and lights

src/raytracer.rs

@@ -0,0 +1,52 @@
+use crate::{
+    primitive::{Intersection, Primitive},
+    ray::Ray,
+    scene::Scene,
+    INFINITY,
+};
+use nalgebra::{distance, Matrix4, Point3, Vector3, Vector4};
+
+// Find the closest intersection, given a ray in world coordinates
+fn get_closest_intersection<'a>(scene: &'a Scene, ray: &Ray) -> Option<Intersection<'a>> {
+    let mut closest_distance = INFINITY;
+    let mut closest_intersect: Option<Intersection> = None;
+    for primitive in &scene.primitives {
+        if primitive.intersect_bounding_box(ray) == None {
+            continue;
+        };
+
+        let intersect = primitive.intersect_ray(ray);
+        if intersect.is_none() {
+            continue;
+        };
+
+        let intersect = intersect.unwrap();
+        if intersect.distance < closest_distance {
+            closest_distance = intersect.distance;
+            closest_intersect = Some(intersect);
+        }
+    }
+    closest_intersect
+}
+
+// We want to shade a point placed in our scene
+fn phong_shade_point(scene: &Scene, intersect: &Intersection) -> Option<Vector4<f32>> {
+    //Unpack the intersection data
+    let Intersection {
+        primitive,
+        point,
+        normal,
+        incidence,
+        distance,
+    } = intersect;
+    let ambient_light = scene.ambient_light;
+    let material = primitive.get_material();
+    let kd = material.kd;
+    let ks = material.kd;
+    let shininess = material.shininess;
+    // We should now have all the information for our ray-tracer
+
+    // Let us first compute the ambient light component
+    let ambient = ambient_light * kd;
+    None
+}