Set absorbed colour in material scatter function

src/render.c

@@ -50,9 +50,11 @@ static vec3_t trace(ray_t ray, const scene_t *scene, rng_t *rng)
 		}
 
 		vec3_t atten;
-		if (!material.scatter(material.params, hit, rng, &ray, &atten))
-			return black;
+		const bool scattered
+		    = material.scatter(material.params, hit, rng, &ray, &atten);
 		colour = vec3_hadamard(colour, atten);
+		if (!scattered)
+			return colour;
 	}
 
 	return black;