New way of handling lights and materials.

directional_light.cpp

@@ -0,0 +1,26 @@
+#include <cmath>
+
+#include <glm/glm.hpp>
+#include <glm/gtc/constants.hpp>
+
+#include "directional_light.hpp"
+
+using glm::pi;
+using glm::reflect;
+using glm::dot;
+
+vec3 DirectionalLight::shade(vec3 normal, Ray & r, Material & m) const {
+  float n_dot_l, r_dot_l;
+  vec3 color, ref;
+
+  //color = m.m_ambient * m_ambient;
+
+  n_dot_l = max(dot(normal, m_position), 0.0);
+  color += (m.m_diffuse / pi<float>()) * m_diffuse * n_dot_l;
+
+  ref = reflect(m_position, normal);
+  r_dot_l = pow(max(dot(ref, r.m_direction), 0.0f), m.m_shininess);
+  color += m.m_specular * m_specular * r_dot_l;
+
+  return color;
+}