upd: anti aliasing

1 files changed, 15 insertions, 4 deletions

diff --git a/src/calculus.rs b/src/calculus.rs
index c9b0574..a39c8a5 100644
--- a/src/calculus.rs
+++ b/src/calculus.rs
@@ -1,4 +1,6 @@
 pub mod calculus {
+    use rand::Rng;
+
     #[derive(Copy, Clone, Debug)]
     pub struct Vec3 {
         pub x: f32,
@@ -68,12 +70,12 @@ pub mod calculus {
         }
     }
 
-    pub struct Ray<'a> {
-        pub origin: &'a Point3,
-        pub direction: &'a Vec3,
+    pub struct Ray {
+        pub origin: Point3,
+        pub direction: Vec3,
     }
 
-    impl<'a> Ray<'a> {
+    impl Ray {
         pub fn at(&self, t: f32) -> Point3 {
             // Get parametric location
             self.origin.add(&self.direction.scalar_mul(t))
@@ -84,4 +86,13 @@ pub mod calculus {
         deg * std::f32::consts::PI / 180.0
     }
 
+    pub fn sample_square() -> Vec3 {
+        // Returns the vector to a random point in the [-.5,-.5]-[+.5,+.5] unit square.
+        let mut rng = rand::rng();
+        Vec3::new(
+            rng.random_range(0.0..1.0) - 0.5,
+            rng.random_range(0.0..1.0) - 0.5,
+            0.0)
+    }
+
 }
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