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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* raytrace.c - routines for tracing and shading rays. |
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unsigned long raynum = 0; /* next unique ray number */ |
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unsigned long nrays = 0; /* number of calls to localhit */ |
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static FLOAT Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
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static RREAL Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
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OBJREC Lamb = { |
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OVOID, MAT_PLASTIC, "Lambertian", |
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{0, 5, NULL, Lambfa}, NULL, |
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static int raymove(), checkhit(); |
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static void checkset(); |
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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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#define RAYHIT (-1) /* return value for intercepted ray */ |
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{ |
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r->rno = raynum++; |
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r->newcset = r->clipset; |
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r->hitf = rayhit; |
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r->robj = OVOID; |
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r->ro = NULL; |
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r->rox = NULL; |
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r->rt = r->rot = FHUGE; |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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r->uv[0] = r->uv[1] = 0.0; |
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setcolor(r->pcol, 1.0, 1.0, 1.0); |
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setcolor(r->rcol, 0.0, 0.0, 0.0); |
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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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******/ |
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/* hack for irradiance calculation */ |
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if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS))) { |
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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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} |
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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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int mod; |
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OBJECT mod; |
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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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/* 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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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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{ |
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OBJREC *o; |
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int i; |
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|
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for (i = oset[0]; i > 0; i--) { |
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o = objptr(oset[i]); |
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if ((*ofun[o->otype].funp)(o, r)) |
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r->robj = oset[i]; |
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} |
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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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} |
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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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OBJECT *cxs; |
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{ |
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OBJECT oset[MAXSET+1]; |
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register OBJREC *o; |
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register int i; |
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objset(oset, cu->cutree); |
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checkset(oset, cxs); /* eliminate double-checking */ |
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for (i = oset[0]; i > 0; i--) { |
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o = objptr(oset[i]); |
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if ((*ofun[o->otype].funp)(o, r)) |
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r->robj = oset[i]; |
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} |
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if (r->ro == NULL) |
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checkset(oset, cxs); /* avoid double-checking */ |
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(*r->hitf)(oset, r); /* test for hit in set */ |
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if (r->robj == OVOID) |
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return(0); /* no scores yet */ |
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return(incube(cu, r->rop)); /* hit OK if in current cube */ |
