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#include "copyright.h" |
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#include "ray.h" |
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#include "source.h" |
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#include "otypes.h" |
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#include "otspecial.h" |
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#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
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OBJREC Aftplane; /* aft clipping plane object */ |
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static int raymove(), checkhit(); |
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static void checkset(); |
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|
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#ifndef MAXLOOP |
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#define MAXLOOP 0 /* modifier loop detection */ |
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#endif |
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|
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#define RAYHIT (-1) /* return value for intercepted ray */ |
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static int raymove(FVECT pos, OBJECT *cxs, int dirf, RAY *r, CUBE *cu); |
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static int checkhit(RAY *r, CUBE *cu, OBJECT *cxs); |
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static void checkset(OBJECT *os, OBJECT *cs); |
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|
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int |
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rayorigin(r, ro, rt, rw) /* start new ray from old one */ |
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register RAY *r, *ro; |
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int rt; |
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double rw; |
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|
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extern int |
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rayorigin( /* start new ray from old one */ |
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register RAY *r, |
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register RAY *ro, |
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int rt, |
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double rw |
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) |
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{ |
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double re; |
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} |
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void |
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rayclear(r) /* clear a ray for (re)evaluation */ |
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register RAY *r; |
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extern void |
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rayclear( /* clear a ray for (re)evaluation */ |
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register RAY *r |
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) |
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{ |
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r->rno = raynum++; |
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r->newcset = r->clipset; |
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} |
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void |
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raytrace(r) /* trace a ray and compute its value */ |
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RAY *r; |
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extern void |
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raytrace( /* trace a ray and compute its value */ |
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RAY *r |
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) |
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{ |
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if (localhit(r, &thescene)) |
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raycont(r); /* hit local surface, evaluate */ |
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} |
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void |
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raycont(r) /* check for clipped object and continue */ |
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register RAY *r; |
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extern void |
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raycont( /* check for clipped object and continue */ |
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register RAY *r |
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) |
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{ |
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if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
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!rayshade(r, r->ro->omod)) |
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} |
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void |
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raytrans(r) /* transmit ray as is */ |
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register RAY *r; |
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extern void |
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raytrans( /* transmit ray as is */ |
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register RAY *r |
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) |
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{ |
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RAY tr; |
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} |
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int |
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rayshade(r, mod) /* shade ray r with material mod */ |
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register RAY *r; |
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int mod; |
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extern int |
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rayshade( /* shade ray r with material mod */ |
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register RAY *r, |
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int mod |
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) |
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{ |
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int gotmat; |
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register OBJREC *m; |
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#if MAXLOOP |
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static int depth = 0; |
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/* check for infinite loop */ |
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if (depth++ >= MAXLOOP) |
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objerror(r->ro, USER, "possible modifier loop"); |
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#endif |
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r->rt = r->rot; /* set effective ray length */ |
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for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) { |
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m = objptr(mod); |
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******/ |
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/* hack for irradiance calculation */ |
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if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) && |
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m->otype != MAT_CLIP && |
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(ofun[m->otype].flags & (T_M|T_X))) { |
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if (irr_ignore(m->otype)) { |
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#if MAXLOOP |
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depth--; |
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#endif |
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raytrans(r); |
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return(1); |
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} |
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/* materials call raytexture */ |
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gotmat = (*ofun[m->otype].funp)(m, r); |
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} |
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#if MAXLOOP |
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depth--; |
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#endif |
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return(gotmat); |
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} |
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void |
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rayparticipate(r) /* compute ray medium participation */ |
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register RAY *r; |
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extern void |
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rayparticipate( /* compute ray medium participation */ |
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register RAY *r |
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) |
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{ |
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COLOR ce, ca; |
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double re, ge, be; |
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} |
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void |
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raytexture(r, mod) /* get material modifiers */ |
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RAY *r; |
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OBJECT mod; |
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extern void |
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raytexture( /* get material modifiers */ |
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RAY *r, |
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OBJECT mod |
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) |
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{ |
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register OBJREC *m; |
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#if MAXLOOP |
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static int depth = 0; |
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/* check for infinite loop */ |
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if (depth++ >= MAXLOOP) |
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objerror(r->ro, USER, "modifier loop"); |
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#endif |
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/* execute textures and patterns */ |
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for ( ; mod != OVOID; mod = m->omod) { |
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m = objptr(mod); |
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objerror(r->ro, USER, errmsg); |
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} |
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} |
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#if MAXLOOP |
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depth--; /* end here */ |
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#endif |
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} |
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int |
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raymixture(r, fore, back, coef) /* mix modifiers */ |
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register RAY *r; |
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OBJECT fore, back; |
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double coef; |
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extern int |
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raymixture( /* mix modifiers */ |
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register RAY *r, |
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OBJECT fore, |
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OBJECT back, |
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double coef |
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) |
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{ |
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RAY fr, br; |
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int foremat, backmat; |
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/* compute foreground and background */ |
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foremat = backmat = 0; |
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/* foreground */ |
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copystruct(&fr, r); |
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fr = *r; |
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if (coef > FTINY) |
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foremat = rayshade(&fr, fore); |
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/* background */ |
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copystruct(&br, r); |
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br = *r; |
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if (coef < 1.0-FTINY) |
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backmat = rayshade(&br, back); |
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/* check for transparency */ |
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if (backmat ^ foremat) |
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if (backmat ^ foremat) { |
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if (backmat && coef > FTINY) |
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raytrans(&fr); |
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else if (foremat && coef < 1.0-FTINY) |
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raytrans(&br); |
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} |
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/* mix perturbations */ |
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for (i = 0; i < 3; i++) |
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r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
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} |
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double |
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raydist(r, flags) /* compute (cumulative) ray distance */ |
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register RAY *r; |
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register int flags; |
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extern double |
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raydist( /* compute (cumulative) ray distance */ |
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register RAY *r, |
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register int flags |
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) |
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{ |
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double sum = 0.0; |
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} |
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double |
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raynormal(norm, r) /* compute perturbed normal for ray */ |
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FVECT norm; |
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register RAY *r; |
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extern double |
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raynormal( /* compute perturbed normal for ray */ |
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FVECT norm, |
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register RAY *r |
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) |
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{ |
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double newdot; |
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register int i; |
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} |
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void |
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newrayxf(r) /* get new tranformation matrix for ray */ |
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RAY *r; |
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extern void |
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newrayxf( /* get new tranformation matrix for ray */ |
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RAY *r |
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) |
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{ |
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static struct xfn { |
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struct xfn *next; |
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} |
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void |
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flipsurface(r) /* reverse surface orientation */ |
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register RAY *r; |
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extern void |
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flipsurface( /* reverse surface orientation */ |
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register RAY *r |
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) |
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{ |
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r->rod = -r->rod; |
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r->ron[0] = -r->ron[0]; |
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} |
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void |
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rayhit(oset, r) /* standard ray hit test */ |
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OBJECT *oset; |
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RAY *r; |
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extern void |
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rayhit( /* standard ray hit test */ |
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OBJECT *oset, |
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RAY *r |
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) |
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{ |
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OBJREC *o; |
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int i; |
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} |
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int |
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localhit(r, scene) /* check for hit in the octree */ |
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register RAY *r; |
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register CUBE *scene; |
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extern int |
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localhit( /* check for hit in the octree */ |
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register RAY *r, |
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register CUBE *scene |
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) |
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{ |
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OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
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FVECT curpos; /* current cube position */ |
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} |
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cxset[0] = 0; |
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raymove(curpos, cxset, sflags, r, scene); |
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return(r->ro != NULL & r->ro != &Aftplane); |
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return((r->ro != NULL) & (r->ro != &Aftplane)); |
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} |
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static int |
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raymove(pos, cxs, dirf, r, cu) /* check for hit as we move */ |
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FVECT pos; /* current position, modified herein */ |
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OBJECT *cxs; /* checked objects, modified by checkhit */ |
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int dirf; /* direction indicators to speed tests */ |
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register RAY *r; |
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register CUBE *cu; |
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raymove( /* check for hit as we move */ |
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FVECT pos, /* current position, modified herein */ |
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OBJECT *cxs, /* checked objects, modified by checkhit */ |
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int dirf, /* direction indicators to speed tests */ |
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register RAY *r, |
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register CUBE *cu |
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) |
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{ |
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int ax; |
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double dt, t; |
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static int |
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checkhit(r, cu, cxs) /* check for hit in full cube */ |
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register RAY *r; |
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CUBE *cu; |
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OBJECT *cxs; |
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checkhit( /* check for hit in full cube */ |
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register RAY *r, |
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CUBE *cu, |
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OBJECT *cxs |
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) |
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{ |
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OBJECT oset[MAXSET+1]; |
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|
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static void |
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checkset(os, cs) /* modify checked set and set to check */ |
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register OBJECT *os; /* os' = os - cs */ |
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register OBJECT *cs; /* cs' = cs + os */ |
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checkset( /* modify checked set and set to check */ |
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register OBJECT *os, /* os' = os - cs */ |
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register OBJECT *cs /* cs' = cs + os */ |
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) |
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{ |
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OBJECT cset[MAXCSET+MAXSET+1]; |
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register int i, j; |