From 31adfd66f48e1f842a1697d5b974e81f49782f11 Mon Sep 17 00:00:00 2001
From: Camden Dixie O'Brien <cobrien@witekio.com>
Date: Tue, 23 Sep 2025 15:35:26 +0100
Subject: [PATCH] Implement Lambertian diffuse scattering

---
 src/camera.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/camera.c b/src/camera.c
index 7c08785..6bbb4f8 100644
--- a/src/camera.c
+++ b/src/camera.c
@@ -29,10 +29,10 @@ static const vec3_t black = { 0.0, 0.0, 0.0 };
 
 static ray_t scatter(hit_t hit, rng_t *rng)
 {
-	const vec3_t rand = rng_vec3(rng);
-	const vec3_t dir
-	    = vec3_dot(rand, hit.normal) > 0.0 ? rand : vec3_scale(rand, -1.0);
-	return (ray_t) { .orig = hit.point, .dir = dir };
+	return (ray_t) {
+		.orig = hit.point,
+		.dir = vec3_add(hit.normal, rng_vec3(rng)),
+	};
 }
 
 static vec3_t