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/* Copyright (c) 1995 Regents of the University of California */ |
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/* SCCSid "$SunId$ LBL" */ |
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/* |
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* ray.h - header file for routines using rays. |
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* |
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* 8/7/85 |
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*/ |
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#include "standard.h" |
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#include "object.h" |
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#include "color.h" |
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#define MAXDIM 32 /* maximum number of dimensions */ |
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#define MAXSLIST 32 /* maximum sources to check */ |
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/* ray type flags */ |
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#define PRIMARY 01 /* original ray */ |
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#define SHADOW 02 /* ray to light source */ |
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#define REFLECTED 04 /* reflected ray */ |
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#define REFRACTED 010 /* refracted (bent) ray */ |
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#define TRANS 020 /* transmitted/transferred ray */ |
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#define AMBIENT 040 /* ray scattered for interreflection */ |
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#define SPECULAR 0100 /* ray scattered for specular */ |
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/* reflected ray types */ |
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#define RAYREFL (SHADOW|REFLECTED|AMBIENT|SPECULAR) |
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typedef struct ray { |
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unsigned long rno; /* unique ray number */ |
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int rlvl; /* number of reflections for this ray */ |
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float rweight; /* cumulative weight of this ray */ |
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short rtype; /* ray type */ |
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short crtype; /* cumulative ray type */ |
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struct ray *parent; /* ray this originated from */ |
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FVECT rorg; /* origin of ray */ |
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FVECT rdir; /* normalized direction of ray */ |
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double rmax; /* maximum distance (aft clipping plane) */ |
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int rsrc; /* source we're aiming for */ |
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OBJECT *clipset; /* set of objects currently clipped */ |
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OBJECT *newcset; /* next clipset, used for transmission */ |
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int (*revf)(); /* evaluation function for this ray */ |
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OBJREC *ro; /* intersected object */ |
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double rot; /* distance to object */ |
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FVECT rop; /* intersection point */ |
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FVECT ron; /* intersection surface normal */ |
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double rod; /* -DOT(rdir, ron) */ |
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FULLXF *rox; /* object transformation */ |
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FVECT pert; /* surface normal perturbation */ |
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COLOR pcol; /* pattern color */ |
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COLOR rcol; /* returned ray value */ |
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double rt; /* returned effective ray length */ |
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COLOR cext; /* medium extinction coefficient */ |
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float albedo; /* medium scattering albedo */ |
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float gecc; /* scattering eccentricity coefficient */ |
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int *slights; /* list of lights to test for scattering */ |
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} RAY; |
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extern int raytrace(); |
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extern double raynormal(); |
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extern double raydistance(); |
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extern int dimlist[]; /* dimension list for distribution */ |
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extern int ndims; /* number of dimensions so far */ |
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extern int samplendx; /* index for this sample */ |
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#define rayvalue(r) (*(r)->revf)(r) |
