upd switch ray

diffusion method

2 files changed, 4 insertions, 3 deletions

diff --git a/src/calculus.rs b/src/calculus.rs
index 8865154..e1e9caf 100644
--- a/src/calculus.rs
+++ b/src/calculus.rs
@@ -34,7 +34,7 @@ pub mod calculus {
             )
         }
 
-        fn random_unit() -> Vec3 {
+        pub fn random_unit() -> Vec3 {
             loop {
                 let p = Self::random_range(-1.0, 1.0);
                 let lensq = p.mag_sqr();
diff --git a/src/camera.rs b/src/camera.rs
index 37e99c6..87ba7c3 100644
--- a/src/camera.rs
+++ b/src/camera.rs
@@ -85,10 +85,11 @@ impl Camera {
         let mut rec = HitRecord::default();
         let ray_t = Interval::new(0.001, f32::INFINITY);
         if world.hit(ray, ray_t, &mut rec) {
-            let direction = Vec3::random_on_hemisphere(&rec.normal);
+            // let direction = Vec3::random_on_hemisphere(&rec.normal);
+            let direction = rec.normal.add(&Vec3::random_unit());
             let origin = rec.position.clone();
             let r = Ray { origin, direction };
-            return self.ray_color(&r, world, depth - 1).mul_scalar(0.5);
+            return self.ray_color(&r, world, depth - 1).mul_scalar(0.9);
         }
 
         let unit_direction = ray.direction.unit();