add ambient intensity

src/Light.cc

@@ -1,4 +1,6 @@
 #include "Light.h"
+#include "Scene.h"
+
 #include <algorithm>
 #include <cmath>
 
@@ -30,7 +32,8 @@ Vector3f PointLight::illumination(const HitRecord &hit,
         g->type() == Geometry::Type::SPHERE)
       return Vector3f::Zero();
 
-  Vector3f ambient_ = geometry->ka() * geometry->ca();
+  Vector3f ambient_ =
+      geometry->ka() * geometry->ca().array() * Scene::current->ai().array();
 
   Vector3f diffuse_ = geometry->kd() * geometry->cd().array() * id_.array() *
                       std::max(0.0f, hit.normal().dot(rayDirection));

src/RayTracer.cc

@@ -85,8 +85,10 @@ void RayTracer::output() {
 void RayTracer::run() {
   parse();
 
-  for (auto scene : scenes)
+  for (auto scene : scenes) {
+    Scene::current = scene;
     render(scene);
+  }
 
   output();
 }

src/Scene.cc

@@ -1,5 +1,7 @@
 #include "Scene.h"
 
+Scene *Scene::current = nullptr;
+
 string Scene::name() const { return name_; }
 
 int Scene::width() { return width_; }
@@ -8,6 +10,8 @@ int Scene::height() { return height_; }
 
 float Scene::fov() { return fov_; }
 
+Vector3f Scene::ai() const { return ai_; }
+
 Vector3f Scene::center() const { return center_; }
 
 Vector3f Scene::up() const { return up_; }

src/Scene.h

@@ -36,6 +36,7 @@ public:
   int width();
   int height();
   float fov();
+  Vector3f ai() const;
   Vector3f center() const;
   Vector3f up() const;
   Vector3f lookAt() const;
@@ -44,6 +45,7 @@ public:
   void setAntialiasing(bool);
   void setTwoSideRender(bool);
   void setGlobalIllum(bool);
+  static Scene *current;
 };
 
 #endif // !SCENE_H_