Rename to pathtrace, started for of depth of field, choose closest intersect

2 files changed, 16 insertions, 5 deletions

diff --git a/src/scene/scene.rs b/src/scene/scene.rs
index 8575217..83a43c7 100644
--- a/src/scene/scene.rs
+++ b/src/scene/scene.rs
@@ -7,6 +7,11 @@ pub struct Scene {
     objs: Vec<Object>,
 }
 
+pub struct SceneIntersect<'a> {
+    pub mat: &'a dyn Material,
+    pub i: Intersection,
+}
+
 impl Scene {
     pub fn new() -> Self {
         Self {
@@ -24,14 +29,19 @@ impl Scene {
         }
     }
 
-    pub fn intersect(&self, ray: &Ray) -> Option<(&dyn Material, Intersection)> {
+    pub fn intersect(&self, ray: &Ray) -> Option<SceneIntersect> {
+        let mut min: Option<SceneIntersect> = None;
+
         for obj in self.objs.iter() {
             if let Some(i) = obj.shape.intersect(&ray) {
-                return Some((obj.mat.as_ref(), i))
+                match min {
+                    Some(ref si) if si.i.t < i.t => (),
+                    _ => min = Some(SceneIntersect {i, mat: obj.mat.as_ref() }),
+                }
             }
         }
 
-        None
+        min
     }
 }
 
diff --git a/src/scene/shapes/sphere.rs b/src/scene/shapes/sphere.rs
index 3f07b9e..eaa6625 100644
--- a/src/scene/shapes/sphere.rs
+++ b/src/scene/shapes/sphere.rs
@@ -44,6 +44,7 @@ impl Hittable for Sphere {
             Some(Intersection {
                 n: self.norm_at(&w),
                 p: w,
+                t: distance,
             })
         }
 
@@ -63,7 +64,7 @@ mod tests {
             direction: Vector3f::new_xyz(0.0, 1.0, 1.5).norm(),
         };
 
-        let dist = sph.intersect(&ray);
-        assert!((dist.unwrap() - 3.28).abs() < 0.01);
+        let dist = sph.intersect(&ray).unwrap();
+        assert!((dist.t - 3.28).abs() < 0.01);
     }
 }