From 9dcbefe5a55d6033da1e2f0bebeb9b96c1f6d495 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?arvid=20schr=C3=B6der?= <arvidschroeder@web.de>
Date: Mon, 28 Nov 2022 19:15:34 +0100
Subject: [PATCH] Added simplistic lambert implementation

---
 shader/lambertshader.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/shader/lambertshader.cpp b/shader/lambertshader.cpp
index 3aebacd..5e94254 100644
--- a/shader/lambertshader.cpp
+++ b/shader/lambertshader.cpp
@@ -8,6 +8,10 @@ Color LambertShader::shade(Scene const &scene, Ray const &ray) const {
   Color fragmentColor;
 
   // IMPLEMENT ME
-
-  return fragmentColor;
+  for (auto& light : scene.lights()) {
+      auto illum = light->illuminate(scene, ray);
+      auto lightAngle = dotProduct(ray.normal, normalized(illum.direction));
+      fragmentColor += illum.color * std::abs(lightAngle);
+  }
+  return fragmentColor * diffuseColor;
 }