Function renderPixelFunction

tutorials/pathtracer/pathtracer_device.cpp:1474–1602

}

Vec3fa renderPixelFunction(const TutorialData& data, float x, float y, RandomSampler& sampler, const ISPCCamera& camera, RayStats& stats, const RTCFeatureFlags features)
{
  /* radiance accumulator and weight */
  Vec3fa L = Vec3fa(0.0f);
  Vec3fa Lw = Vec3fa(1.0f);
  Medium medium = make_Medium_Vacuum();
  float time = RandomSampler_get1D(sampler);

  /* initialize ray */
  Ray ray(Vec3fa(camera.xfm.p),
                     Vec3fa(normalize(x*camera.xfm.l.vx + y*camera.xfm.l.vy + camera.xfm.l.vz)),0.0f,inf,time);

  DifferentialGeometry dg;
 
  /* iterative path tracer loop */
  for (int i=0; i<data.max_path_length; i++)
  {
    /* terminate if contribution too low */
    if (max(Lw.x,max(Lw.y,Lw.z)) < 0.01f)
      break;

    /* intersect ray with scene */
    RayQueryContext context;
    InitIntersectionContext(&context);
    context.tutorialData = (void*) &data;
    
    RTCIntersectArguments args;
    rtcInitIntersectArguments(&args);
    args.context = &context.context;
    args.flags = (i == 0) ? data.iflags_coherent : data.iflags_incoherent;
    args.feature_mask = features;
#if USE_ARGUMENT_CALLBACKS && ENABLE_FILTER_FUNCTION
    args.filter = nullptr;
#endif
  
    rtcTraversableIntersect1(data.traversable,RTCRayHit_(ray),&args);
    RayStats_addRay(stats);
    const Vec3fa wo = neg(ray.dir);

    /* invoke environment lights if nothing hit */
    if (ray.geomID == RTC_INVALID_GEOMETRY_ID)
    {
      //L = L + Lw*Vec3fa(1.0f);

      /* iterate over all lights */
      for (unsigned int i=0; i<data.ispc_scene->numLights; i++)
      {
        const Light* l = data.ispc_scene->lights[i];
        //Light_EvalRes le = l->eval(l,dg,ray.dir);
        Light_EvalRes le = Lights_eval(l,dg,ray.dir);
        L = L + Lw*le.value;
      }

      break;
    }

    Vec3fa Ns = normalize(ray.Ng);