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* bsdf.h |
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* |
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* Declarations for bidirectional scattering distribution functions. |
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* Assumes <stdio.h> already included. |
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* |
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* A material is oriented in right-hand coordinate system with X-axis |
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* in the surface plane pointed to the right as seen from the front. |
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#ifndef _BSDF_H_ |
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#define _BSDF_H_ |
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#include "platform.h" |
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#include "fvect.h" |
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#include "ccolor.h" |
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#include "platform.h" |
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#ifdef __cplusplus |
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extern "C" { |
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/* Methods needed to handle BSDF components (nothing is optional) */ |
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typedef struct { |
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/* return non-diffuse BSDF */ |
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int (*getBSDFs)(float coef[SDmaxCh], const FVECT outVec, |
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const FVECT inVec, SDComponent *sdc); |
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int (*getBSDFs)(float coef[SDmaxCh], const FVECT inVec, |
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const FVECT outVec, SDComponent *sdc); |
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/* query non-diffuse PSA for vector */ |
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SDError (*queryProjSA)(double *psa, const FVECT v1, |
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const RREAL *v2, int qflags, |
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/* Convert 1-dimensional random variable to N-dimensional */ |
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extern void SDmultiSamp(double t[], int n, double randX); |
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/* Map a [0,1]^2 square to a unit radius disk */ |
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extern void SDsquare2disk(double ds[2], double seedx, double seedy); |
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/* Map point on unit disk to a unit square in [0,1]^2 range */ |
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extern void SDdisk2square(double sq[2], double diskx, double disky); |
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/***************************************************************** |
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* The calls below are the ones most applications require. |
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* All directions are assumed to be unit vectors. |
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const SDData *sd); |
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/* Return BSDF for the given incident and scattered ray vectors */ |
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extern SDError SDevalBSDF(SDValue *sv, const FVECT outVec, |
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const FVECT inVec, const SDData *sd); |
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extern SDError SDevalBSDF(SDValue *sv, const FVECT inVec, |
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const FVECT outVec, const SDData *sd); |
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/* Compute directional hemispherical scattering at given incident angle */ |
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extern double SDdirectHemi(const FVECT inVec, |
