WIP: library: render: pathtrace: add Path struct

pathtracer/src/render/pathtrace/mod.rs

@@ -1,2 +1,4 @@
+mod path;
+
 mod pathtracer;
 pub use self::pathtracer::*;

pathtracer/src/render/pathtrace/path.rs

@@ -0,0 +1,44 @@
+use crate::core::LightProperties;
+use crate::{Point, Vector};
+use nalgebra::Unit;
+
+pub struct PathPoint {
+    pub point: Point,
+    pub incident: Unit<Vector>,
+    pub normal: Unit<Vector>,
+    pub properties: LightProperties,
+}
+
+impl PathPoint {
+    pub fn new(
+        point: Point,
+        incident: Unit<Vector>,
+        normal: Unit<Vector>,
+        properties: LightProperties,
+    ) -> Self {
+        PathPoint {
+            point,
+            incident,
+            normal,
+            properties,
+        }
+    }
+}
+
+pub struct Path {
+    pub origin: Point,
+    pub points: Vec<PathPoint>,
+}
+
+impl Path {
+    pub fn new(origin: Point) -> Self {
+        Path {
+            origin,
+            points: Vec::new(),
+        }
+    }
+
+    pub fn push_point(&mut self, new_point: PathPoint) {
+        self.points.push(new_point)
+    }
+}