RadiancePmap/pmapbias.h
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pmapbias.h
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			/* RCSid $Id: pmapbias.h,v 2.5 2016/05/17 17:39:47 rschregle Exp $ */

			/*
			==================================================================
			Bias compensation for photon density estimates

			For background see:
			R. Schregle, "Bias Compensation for Photon Maps",
			Computer Graphics Forum, v22:n4, pp. 729-742, Dec. 2003.

			Roland Schregle (roland.schregle@gmail.com)
			(c) Fraunhofer Institute for Solar Energy Systems
			==================================================================

			$Id: pmapbias.h,v 2.5 2016/05/17 17:39:47 rschregle Exp $
			*/


			#ifndef PMAPBIASCOMP_H
			#define PMAPBIASCOMP_H

			#include "pmapdata.h"

			/* Bias compensation history node */
			typedef struct {
			COLOR irrad;
			float weight;
			} PhotonBiasCompNode;


			/* Bias compensation weighting function */
			/* #define BIASCOMP_WGT(n) 1 */
			/* #define BIASCOMP_WGT(n) (n) */
			#define BIASCOMP_WGT(n) ((n) * (n))
			/* #define BIASCOMP_WGT(n) ((n) * (n) * (n)) */
			/* #define BIASCOMP_WGT(n) exp(0.003 * (n)) */

			/* Dump photon bandwidth for bias compensated density estimates */
			/* #define BIASCOMP_BWIDTH */


			void biasComp (PhotonMap*, COLOR);
			/* Photon density estimate with bias compensation, returning irradiance.
			Expects photons in search queue after a kd-tree lookup. */

			void volumeBiasComp (PhotonMap, const RAY, COLOR);
			/* Photon volume density estimate with bias compensation, returning
			irradiance. Expects photons in search queue after a kd-tree lookup. */

			#endif