Added presentations from EVI 2017

EVI - 2017/EVI 21/EVIray/point_light.cpp

@@ -0,0 +1,42 @@
+#include <glm/glm.hpp>
+#include <glm/gtc/constants.hpp>
+
+#include "point_light.hpp"
+
+using glm::pi;
+using glm::reflect;
+using glm::length;
+using glm::normalize;
+using glm::dot;
+using glm::pow;
+using glm::max;
+
+vec3 PointLight::direction(vec3 point) const {
+  return normalize(m_position - point);
+}
+
+float PointLight::distance(vec3 point) const {
+  return length(m_position - point);
+}
+
+vec3 PointLight::diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const {
+  float d, att;
+  vec3 l_dir, ref;
+
+  l_dir = direction(i_pos);
+  d = distance(i_pos);
+  att = 1.0f / (m_const_att + (m_lin_att * d) + (m_quad_att * (d * d)));
+
+  return att * m.m_brdf->diffuse(l_dir, normal, r, i_pos, m_diffuse);
+}
+
+vec3 PointLight::specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const {
+  float d, att;
+  vec3 l_dir, ref;
+
+  l_dir = direction(i_pos);
+  d = distance(i_pos);
+  att = 1.0f / (m_const_att + (m_lin_att * d) + (m_quad_att * (d * d)));
+
+  return att * m.m_brdf->specular(l_dir, normal, r, i_pos, m_specular, m.m_shininess);
+}