Function GetFormFactorForElementSuperDetail

editor/rad_cast.cpp:692–796

}

float GetFormFactorForElementSuperDetail(rad_surface *dest_surf, rad_element *dest_element) {
  int touched = 0;
  vector dest_center;
  float ray_area;
  int ignored = 0;
  vector light_center;
  vector patch_center;
  float form_factor = 0.0;
  int multiple_shoots = 0;

  ray_area = rad_MaxElement->area;

  if (rad_MaxElement->flags & EF_IGNORE)
    return 0;

  float rmax = GetMaxColor(&rad_MaxElement->exitance);

  float temp_factor = 0.0;

  GetCenterOfSurface(rad_MaxSurface, &patch_center);
  GetCenterOfElement(rad_MaxElement, &light_center);
  light_center += (rad_MaxSurface->normal / 16.0);

  GetCenterOfElement(dest_element, &dest_center);
  dest_center += (dest_surf->normal / 16.0);

  int hit = 0;
  vector ray = light_center - dest_center;
  vector revray = dest_center - light_center;

  if ((vm_DotProduct(&ray, &dest_surf->normal)) < 0)
    return 0;
  if ((vm_DotProduct(&revray, &rad_MaxSurface->normal)) < 0)
    return 0;

  // Check to see if this ray even matters
  float ray_length = vm_GetMagnitudeFast(&ray);
  vector dest_norm_ray = ray / ray_length;
  vector src_norm_ray = -dest_norm_ray;
  vector dest_normal = dest_surf->normal;
  float ff;
  vector src_normal = rad_MaxSurface->normal;
  ff = (vm_DotProduct(&src_norm_ray, &src_normal) * vm_DotProduct(&dest_normal, &dest_norm_ray)) /
       ((3.14 * ray_length * ray_length) + ray_area);
  ff *= ray_area;
  ff *= rmax;

  // If shooting from elements, scale the test up
  ff *= rad_MaxSurface->area / rad_MaxElement->area;

  if (ff < Ignore_limit) {
    Rays_ignored++;
    return 0;
  }

  hit = ShootRayFromPoint(&light_center, &dest_center, rad_MaxSurface, dest_surf);

  if (hit) {