Area lights fixed.

disk_area_light.cpp

@@ -14,7 +14,7 @@ float d, att, ln_dot_d, d2, g;
   l_dir = normalize(direction(i_pos));
   ln_dot_d = dot(-m_n_at_last_sample, l_dir);
   if (ln_dot_d > 0.0f) {
-    d2 = glm::distance(m_last_sample, i_pos);
+    d2 = distance(i_pos);
     d2 *= d2;
     g = ln_dot_d / d2;
     d = distance(i_pos);

light.hpp

@@ -10,6 +10,7 @@
 
 using glm::vec3;
 using glm::length;
+using glm::normalize;
 
 class Light {
 public:
@@ -61,7 +62,7 @@ public:
   AreaLight(Figure * _f): Light(AREA), m_figure(_f), m_last_sample(vec3()), m_n_at_last_sample(vec3()) { }
 
   virtual vec3 direction(vec3 point) const {
-    return m_last_sample - point;
+    return normalize(m_last_sample - point);
   }
 
   virtual float distance(vec3 point) const {

point_light.cpp

@@ -23,7 +23,7 @@ vec3 PointLight::diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const {
   float d, att;
   vec3 l_dir, ref;
 
-  l_dir = normalize(direction(i_pos));
+  l_dir = direction(i_pos);
   d = distance(i_pos);
   att = 1.0f / (m_const_att + (m_lin_att * d) + (m_quad_att * (d * d)));
 
@@ -34,7 +34,7 @@ vec3 PointLight::specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const
   float d, att;
   vec3 l_dir, ref;
 
-  l_dir = normalize(direction(i_pos));
+  l_dir = direction(i_pos);
   d = distance(i_pos);
   att = 1.0f / (m_const_att + (m_lin_att * d) + (m_quad_att * (d * d)));
 

scenes/scene6.json

@@ -1,7 +1,6 @@
 {
-    "disk_area_light": {
-	"position": [0.0, 0.75, -1.0],
-	"normal": [0.0, -1.0, 0.0],
+    "sphere_area_light": {
+	"position": [0.0, 0.95, -1.0],
 	"radius": 0.15,
 	"material": {
 	    "emission": [1.0, 1.0, 1.0]

spot_light.cpp

@@ -17,7 +17,7 @@ vec3 SpotLight::diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const {
   float d, att, spot_effect;
   vec3 l_dir, ref;
 
-  l_dir = normalize(direction(i_pos));
+  l_dir = direction(i_pos);
   d = distance(i_pos);
   spot_effect = dot(m_spot_dir, -l_dir);
   
@@ -34,7 +34,7 @@ vec3 SpotLight::specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const {
   float d, att, spot_effect;
   vec3 l_dir, ref;
 
-  l_dir = normalize(direction(i_pos));
+  l_dir = direction(i_pos);
   d = distance(i_pos);
   spot_effect = dot(m_spot_dir, -l_dir);