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/* Copyright (c) 1991 Regents of the University of California */ |
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/* Copyright (c) 1994 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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RAY *r; |
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{ |
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extern int (*trace)(); |
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int gotmat; |
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if (localhit(r, &thescene)) |
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raycont(r); |
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gotmat = raycont(r); |
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else if (sourcehit(r)) |
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rayshade(r, r->ro->omod); |
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gotmat = rayshade(r, r->ro->omod); |
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if (!gotmat) |
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objerror(r->ro, USER, "material not found"); |
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|
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if (trace != NULL) |
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(*trace)(r); /* trace execution */ |
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} |
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register RAY *r; |
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{ |
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if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
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r->ro->omod == OVOID) |
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r->ro->omod == OVOID) { |
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raytrans(r); |
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else |
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rayshade(r, r->ro->omod); |
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return(1); |
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} |
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return(rayshade(r, r->ro->omod)); |
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} |
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int mod; |
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{ |
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static int depth = 0; |
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int gotmat; |
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register OBJREC *m; |
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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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r->rt = r->rot; /* set effective ray length */ |
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for ( ; mod != OVOID; mod = m->omod) { |
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for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) { |
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m = objptr(mod); |
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/****** unnecessary test since modifier() is always called |
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if (!ismodifier(m->otype)) { |
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if (!islight(m->otype)) |
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m = &Lamb; |
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} |
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(*ofun[m->otype].funp)(m, r); /* execute function */ |
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if (ismaterial(m->otype)) { /* materials call raytexture */ |
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depth--; |
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return; /* we're done */ |
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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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objerror(r->ro, USER, "material not found"); |
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depth--; |
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return(gotmat); |
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} |
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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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if (!istexture(m->otype)) { |
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/****** unnecessary test since modifier() is always called |
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if (!ismodifier(m->otype)) { |
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sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
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error(USER, errmsg); |
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} |
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(*ofun[m->otype].funp)(m, r); |
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******/ |
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if ((*ofun[m->otype].funp)(m, r)) |
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objerror(USER, r->ro, "conflicting materials"); |
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} |
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depth--; /* end here */ |
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} |
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OBJECT fore, back; |
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double coef; |
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{ |
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FVECT curpert, forepert, backpert; |
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COLOR curpcol, forepcol, backpcol; |
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RAY fr, br; |
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COLOR ctmp; |
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int foremat, backmat; |
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register int i; |
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/* clip coefficient */ |
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if (coef > 1.0) |
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coef = 1.0; |
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else if (coef < 0.0) |
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coef = 0.0; |
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/* save current mods */ |
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VCOPY(curpert, r->pert); |
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copycolor(curpcol, r->pcol); |
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/* compute new mods */ |
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/* foreground */ |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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setcolor(r->pcol, 1.0, 1.0, 1.0); |
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/* foreground */ |
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copystruct(&fr, r); |
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fr.pert[0] = fr.pert[1] = fr.pert[2] = 0.0; |
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setcolor(fr.pcol, 1.0, 1.0, 1.0); |
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setcolor(fr.rcol, 0.0, 0.0, 0.0); |
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if (fore != OVOID && coef > FTINY) |
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raytexture(r, fore); |
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VCOPY(forepert, r->pert); |
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copycolor(forepcol, r->pcol); |
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/* background */ |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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setcolor(r->pcol, 1.0, 1.0, 1.0); |
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foremat = rayshade(&fr, fore); |
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else |
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foremat = 0; |
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/* background */ |
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copystruct(&br, r); |
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br.pert[0] = br.pert[1] = br.pert[2] = 0.0; |
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setcolor(br.pcol, 1.0, 1.0, 1.0); |
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setcolor(br.rcol, 0.0, 0.0, 0.0); |
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if (back != OVOID && coef < 1.0-FTINY) |
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raytexture(r, back); |
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VCOPY(backpert, r->pert); |
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copycolor(backpcol, r->pcol); |
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backmat = rayshade(&br, back); |
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else |
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backmat = foremat; |
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/* check */ |
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if (backmat != foremat) |
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objerror(USER, r->ro, "mixing material with non-material"); |
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/* sum perturbations */ |
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for (i = 0; i < 3; i++) |
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r->pert[i] = curpert[i] + coef*forepert[i] + |
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(1.0-coef)*backpert[i]; |
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/* multiply colors */ |
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setcolor(r->pcol, coef*colval(forepcol,RED) + |
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(1.0-coef)*colval(backpcol,RED), |
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coef*colval(forepcol,GRN) + |
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(1.0-coef)*colval(backpcol,GRN), |
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coef*colval(forepcol,BLU) + |
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(1.0-coef)*colval(backpcol,BLU)); |
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multcolor(r->pcol, curpcol); |
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r->pert[i] += coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
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/* multiply pattern colors */ |
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scalecolor(fr.pcol, coef); |
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scalecolor(br.pcol, 1.0-coef); |
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copycolor(ctmp, fr.pcol); |
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addcolor(ctmp, br.pcol); |
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multcolor(r->pcol, ctmp); |
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/* sum returned ray values */ |
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scalecolor(fr.rcol, coef); |
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scalecolor(br.rcol, 1.0-coef); |
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addcolor(r->rcol, fr.rcol); |
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addcolor(r->rcol, br.rcol); |
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/* return value tells if material */ |
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return(foremat); |
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} |
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