glm::vec3 rayTrace(Ray &ray, const float& t, const glm::vec3& normal, RayTracerState& state) {
std::vector<std::shared_ptr<LightObject>>::iterator iter;
glm::vec3 color;
glm::vec3 p = ray.getOrigin() + t*ray.getDirection();
for(iter = state.getLights().begin(); iter != state.getLights().end(); iter++){
float shadow_value;
shadow_value = (*iter)->PointInShadow(p, state);
//skipping contribution from this light if the object is fully shadowed by it
if(shadow_value <=0.00001f)
continue;
glm::vec3 pos = (*iter)->position;
glm::vec3 diff = (*iter)->diff;
glm::vec3 spec = (*iter)->spec;
glm::vec3 v = glm::normalize(ray.getOrigin() - p);
glm::vec3 l = glm::normalize(pos - p);
glm::vec3 h = glm::normalize(v+l);
glm::vec3 n = glm::normalize(normal);
float diffuse = glm::max(0.0f, glm::dot(n, l));
float specular = glm::pow( glm::max(0.0f, glm::dot(n, h)), 50.0f);
glm::vec3 new_color = glm::vec3( (diff*diffuse)+(spec*specular) ) * shadow_value ;
color += new_color;
}
color/=state.getLights().size();
//glm::vec3 absnormal = glm::vec3(abs(normal.x),abs(normal.y),abs(normal.z));
return color;//*shadefactor;
}
