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/*
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==================================================================
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Bias compensation for photon density estimates
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For background see:
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R. Schregle, "Bias Compensation for Photon Maps",
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Computer Graphics Forum, v22:n4, pp. 729-742, Dec. 2003.
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
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(c) Fraunhofer Institute for Solar Energy Systems,
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Lucerne University of Applied Sciences & Arts
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==================================================================
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$Id: pmapbias.h,v 1.3 2014/09/24 09:36:16 taschreg Exp $
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*/
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#ifndef PMAPBIASCOMP_H
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#define PMAPBIASCOMP_H
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#include "pmapdata.h"
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/* Bias compensation weighting function */
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/* #define BIASCOMP_WGT(n) 1 */
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/* #define BIASCOMP_WGT(n) (n) */
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#define BIASCOMP_WGT(n) ((n) * (n))
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/* #define BIASCOMP_WGT(n) ((n) * (n) * (n)) */
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/* #define BIASCOMP_WGT(n) exp(0.003 * (n)) */
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/* Dump photon bandwidth for bias compensated density estimates */
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/* #define BIASCOMP_BWIDTH */
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void biasComp (PhotonMap*, COLOR);
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/* Photon density estimate with bias compensation, returning irradiance.
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Expects photons in search queue after a kd-tree lookup. */
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void volumeBiasComp (PhotonMap*, const RAY*, COLOR);
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/* Photon volume density estimate with bias compensation, returning
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irradiance. Expects photons in search queue after a kd-tree lookup. */
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#endif
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