/* 
   ======================================================================
   In-core kd-tree for 4D TRANSIENT photon map. Based on pmapkdt.h with
   extensions to handle photon path length (representing time of flight).

   Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
   (c) Tokyo University of Science,
       supported by the JSPS Grants-in-Aid for Scientific Research 
       (KAKENHI JP19KK0115, "Three-Dimensional Light Flow")
   ======================================================================
   
   $Id$
*/


#ifndef PMAPTKDT_H
   #define PMAPTKDT_H

   #include "pmapkdt.h"

   int kdT_TransFindPhotons (struct PhotonMap* pmap, const FVECT pos, 
      const FVECT norm
   );
   /* Locate pmap -> squeue.len nearest photons to pos with similar normal
    * (ignored if NULL) at time pmap->time for speed of light pmap->velocity.
    * Return nearest photons in search queue pmap->squeue, starting with the
    * furthest photon at pmap -> squeue.node.
    * Return value = -1 if none found, else 0.  */

   int kdT_TransFind1Photon (struct PhotonMap* pmap, const FVECT pos, 
      const FVECT norm, Photon *photon
   );
   /* Locate single nearest photon to pos with similar normal at time
    * pmap->time for speed of light pmap->velocity. 
    * Return value = -1 if none found, else 0.  */
#endif