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/* Copyright (c) 1995 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* raytrace.c - routines for tracing and shading rays. |
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* |
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* 8/7/85 |
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* External symbols declared in ray.h |
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*/ |
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|
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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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|
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#include "ray.h" |
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|
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#include "octree.h" |
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|
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#include "otypes.h" |
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|
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#include "otspecial.h" |
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|
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#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
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|
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extern CUBE thescene; /* our scene */ |
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extern int maxdepth; /* maximum recursion depth */ |
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extern double minweight; /* minimum ray weight */ |
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extern int do_irrad; /* compute irradiance? */ |
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|
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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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|
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|
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OBJREC Aftplane; /* aft clipping plane object */ |
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|
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static int raymove(), checkset(), checkhit(); |
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static int raymove(), checkhit(); |
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static void checkset(); |
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|
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#define MAXLOOP 128 /* modifier loop detection */ |
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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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|
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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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double re; |
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|
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if ((r->parent = ro) == NULL) { /* primary ray */ |
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r->rlvl = 0; |
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r->rweight = rw; |
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r->rsrc = -1; |
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r->clipset = NULL; |
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r->revf = raytrace; |
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copycolor(r->cext, cextinction); |
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copycolor(r->albedo, salbedo); |
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r->gecc = seccg; |
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r->slights = NULL; |
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} else { /* spawned ray */ |
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r->rlvl = ro->rlvl; |
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if (rt & RAYREFL) { |
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r->rlvl++; |
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r->rsrc = -1; |
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r->clipset = ro->clipset; |
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r->rmax = 0.0; |
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} else { |
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r->rsrc = ro->rsrc; |
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r->clipset = ro->newcset; |
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r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
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} |
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r->revf = ro->revf; |
128 |
< |
r->rweight = ro->rweight * rw; |
128 |
> |
copycolor(r->cext, ro->cext); |
129 |
> |
copycolor(r->albedo, ro->albedo); |
130 |
> |
r->gecc = ro->gecc; |
131 |
> |
r->slights = ro->slights; |
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r->crtype = ro->crtype | (r->rtype = rt); |
133 |
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VCOPY(r->rorg, ro->rop); |
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r->rmax = 0.0; |
134 |
> |
r->rweight = ro->rweight * rw; |
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/* estimate absorption */ |
136 |
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re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
137 |
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colval(ro->cext,RED) : colval(ro->cext,GRN); |
138 |
> |
if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
139 |
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if (re > 0.) |
140 |
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r->rweight *= exp(-re*ro->rot); |
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} |
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rayclear(r); |
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return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
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} |
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|
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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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{ |
151 |
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r->rno = raynum++; |
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r->newcset = r->clipset; |
153 |
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r->robj = OVOID; |
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r->ro = NULL; |
155 |
< |
r->rot = FHUGE; |
155 |
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r->rox = NULL; |
156 |
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r->rt = r->rot = FHUGE; |
157 |
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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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setcolor(r->rcol, 0.0, 0.0, 0.0); |
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r->rt = 0.0; |
160 |
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} |
161 |
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|
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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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{ |
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extern int (*trace)(); |
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int gotmat; |
98 |
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|
167 |
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if (localhit(r, &thescene)) |
168 |
< |
gotmat = raycont(r); |
168 |
> |
raycont(r); /* hit local surface, evaluate */ |
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else if (r->ro == &Aftplane) { |
170 |
< |
r->ro = NULL; |
170 |
> |
r->ro = NULL; /* hit aft clipping plane */ |
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r->rot = FHUGE; |
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} else if (sourcehit(r)) |
173 |
< |
gotmat = rayshade(r, r->ro->omod); |
173 |
> |
rayshade(r, r->ro->omod); /* distant source */ |
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|
175 |
< |
if (r->ro != NULL && !gotmat) |
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objerror(r->ro, USER, "material not found"); |
175 |
> |
rayparticipate(r); /* for participating medium */ |
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|
177 |
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if (trace != NULL) |
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(*trace)(r); /* trace execution */ |
179 |
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} |
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|
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|
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void |
183 |
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raycont(r) /* check for clipped object and continue */ |
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register RAY *r; |
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{ |
186 |
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if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
187 |
< |
r->ro->omod == OVOID) { |
187 |
> |
!rayshade(r, r->ro->omod)) |
188 |
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raytrans(r); |
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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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|
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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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{ |
197 |
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|
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if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
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VCOPY(tr.rdir, r->rdir); |
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if (r->rmax > FTINY) |
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tr.rmax = r->rmax - r->rot; |
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rayvalue(&tr); |
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copycolor(r->rcol, tr.rcol); |
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r->rt = r->rot + tr.rt; |
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} |
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|
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|
207 |
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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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{ |
147 |
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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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#if MAXLOOP |
215 |
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static int depth = 0; |
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/* check for infinite loop */ |
217 |
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if (depth++ >= MAXLOOP) |
218 |
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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 */ |
221 |
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for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) { |
222 |
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m = objptr(mod); |
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/* hack for irradiance calculation */ |
230 |
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if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS))) { |
231 |
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if (irr_ignore(m->otype)) { |
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#if MAXLOOP |
233 |
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depth--; |
234 |
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#endif |
235 |
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raytrans(r); |
236 |
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return(1); |
237 |
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} |
241 |
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/* materials call raytexture */ |
242 |
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gotmat = (*ofun[m->otype].funp)(m, r); |
243 |
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} |
244 |
+ |
#if MAXLOOP |
245 |
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depth--; |
246 |
+ |
#endif |
247 |
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return(gotmat); |
248 |
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} |
249 |
|
|
250 |
|
|
251 |
+ |
void |
252 |
+ |
rayparticipate(r) /* compute ray medium participation */ |
253 |
+ |
register RAY *r; |
254 |
+ |
{ |
255 |
+ |
COLOR ce, ca; |
256 |
+ |
double re, ge, be; |
257 |
+ |
|
258 |
+ |
if (intens(r->cext) <= 1./FHUGE) |
259 |
+ |
return; /* no medium */ |
260 |
+ |
re = r->rot*colval(r->cext,RED); |
261 |
+ |
ge = r->rot*colval(r->cext,GRN); |
262 |
+ |
be = r->rot*colval(r->cext,BLU); |
263 |
+ |
if (r->crtype & SHADOW) { /* no scattering for sources */ |
264 |
+ |
re *= 1. - colval(r->albedo,RED); |
265 |
+ |
ge *= 1. - colval(r->albedo,GRN); |
266 |
+ |
be *= 1. - colval(r->albedo,BLU); |
267 |
+ |
} |
268 |
+ |
setcolor(ce, re<=0. ? 1. : re>92. ? 0. : exp(-re), |
269 |
+ |
ge<=0. ? 1. : ge>92. ? 0. : exp(-ge), |
270 |
+ |
be<=0. ? 1. : be>92. ? 0. : exp(-be)); |
271 |
+ |
multcolor(r->rcol, ce); /* path absorption */ |
272 |
+ |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
273 |
+ |
return; /* no scattering */ |
274 |
+ |
setcolor(ca, |
275 |
+ |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
276 |
+ |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
277 |
+ |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
278 |
+ |
addcolor(r->rcol, ca); /* ambient in scattering */ |
279 |
+ |
srcscatter(r); /* source in scattering */ |
280 |
+ |
} |
281 |
+ |
|
282 |
+ |
|
283 |
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raytexture(r, mod) /* get material modifiers */ |
284 |
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RAY *r; |
285 |
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int mod; |
286 |
|
{ |
184 |
– |
static int depth = 0; |
287 |
|
register OBJREC *m; |
288 |
+ |
#if MAXLOOP |
289 |
+ |
static int depth = 0; |
290 |
|
/* check for infinite loop */ |
291 |
|
if (depth++ >= MAXLOOP) |
292 |
|
objerror(r->ro, USER, "modifier loop"); |
293 |
+ |
#endif |
294 |
|
/* execute textures and patterns */ |
295 |
|
for ( ; mod != OVOID; mod = m->omod) { |
296 |
|
m = objptr(mod); |
306 |
|
objerror(r->ro, USER, errmsg); |
307 |
|
} |
308 |
|
} |
309 |
+ |
#if MAXLOOP |
310 |
|
depth--; /* end here */ |
311 |
+ |
#endif |
312 |
|
} |
313 |
|
|
314 |
|
|
315 |
+ |
int |
316 |
|
raymixture(r, fore, back, coef) /* mix modifiers */ |
317 |
|
register RAY *r; |
318 |
|
OBJECT fore, back; |
321 |
|
RAY fr, br; |
322 |
|
int foremat, backmat; |
323 |
|
register int i; |
324 |
< |
/* clip coefficient */ |
324 |
> |
/* bound coefficient */ |
325 |
|
if (coef > 1.0) |
326 |
|
coef = 1.0; |
327 |
|
else if (coef < 0.0) |
328 |
|
coef = 0.0; |
329 |
|
/* compute foreground and background */ |
330 |
< |
foremat = backmat = -1; |
330 |
> |
foremat = backmat = 0; |
331 |
|
/* foreground */ |
332 |
|
copystruct(&fr, r); |
333 |
< |
if (fore != OVOID && coef > FTINY) |
333 |
> |
if (coef > FTINY) |
334 |
|
foremat = rayshade(&fr, fore); |
335 |
|
/* background */ |
336 |
|
copystruct(&br, r); |
337 |
< |
if (back != OVOID && coef < 1.0-FTINY) |
337 |
> |
if (coef < 1.0-FTINY) |
338 |
|
backmat = rayshade(&br, back); |
339 |
< |
/* check */ |
340 |
< |
if (foremat < 0) |
341 |
< |
if (backmat < 0) |
342 |
< |
foremat = backmat = 0; |
343 |
< |
else |
344 |
< |
foremat = backmat; |
237 |
< |
else if (backmat < 0) |
238 |
< |
backmat = foremat; |
239 |
< |
if ((foremat==0) != (backmat==0)) |
240 |
< |
objerror(r->ro, USER, "mixing material with non-material"); |
339 |
> |
/* check for transparency */ |
340 |
> |
if (backmat ^ foremat) |
341 |
> |
if (backmat && coef > FTINY) |
342 |
> |
raytrans(&fr); |
343 |
> |
else if (foremat && coef < 1.0-FTINY) |
344 |
> |
raytrans(&br); |
345 |
|
/* mix perturbations */ |
346 |
|
for (i = 0; i < 3; i++) |
347 |
|
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
350 |
|
scalecolor(br.pcol, 1.0-coef); |
351 |
|
copycolor(r->pcol, fr.pcol); |
352 |
|
addcolor(r->pcol, br.pcol); |
353 |
+ |
/* return value tells if material */ |
354 |
+ |
if (!foremat & !backmat) |
355 |
+ |
return(0); |
356 |
|
/* mix returned ray values */ |
357 |
< |
if (foremat) { |
358 |
< |
scalecolor(fr.rcol, coef); |
359 |
< |
scalecolor(br.rcol, 1.0-coef); |
360 |
< |
copycolor(r->rcol, fr.rcol); |
361 |
< |
addcolor(r->rcol, br.rcol); |
362 |
< |
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
357 |
> |
scalecolor(fr.rcol, coef); |
358 |
> |
scalecolor(br.rcol, 1.0-coef); |
359 |
> |
copycolor(r->rcol, fr.rcol); |
360 |
> |
addcolor(r->rcol, br.rcol); |
361 |
> |
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
362 |
> |
return(1); |
363 |
> |
} |
364 |
> |
|
365 |
> |
|
366 |
> |
double |
367 |
> |
raydist(r, flags) /* compute (cumulative) ray distance */ |
368 |
> |
register RAY *r; |
369 |
> |
register int flags; |
370 |
> |
{ |
371 |
> |
double sum = 0.0; |
372 |
> |
|
373 |
> |
while (r != NULL && r->crtype&flags) { |
374 |
> |
sum += r->rot; |
375 |
> |
r = r->parent; |
376 |
|
} |
377 |
< |
/* return value tells if material */ |
258 |
< |
return(foremat); |
377 |
> |
return(sum); |
378 |
|
} |
379 |
|
|
380 |
|
|
413 |
|
} |
414 |
|
|
415 |
|
|
416 |
+ |
void |
417 |
|
newrayxf(r) /* get new tranformation matrix for ray */ |
418 |
|
RAY *r; |
419 |
|
{ |
433 |
|
if (rp->rox == &xp->xf) { /* xp in use */ |
434 |
|
xp = xp->next; /* move to next */ |
435 |
|
if (xp == xflast) { /* need new one */ |
436 |
< |
xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
436 |
> |
xp = (struct xfn *)malloc(sizeof(struct xfn)); |
437 |
|
if (xp == NULL) |
438 |
|
error(SYSTEM, |
439 |
|
"out of memory in newrayxf"); |
450 |
|
} |
451 |
|
|
452 |
|
|
453 |
+ |
void |
454 |
|
flipsurface(r) /* reverse surface orientation */ |
455 |
|
register RAY *r; |
456 |
|
{ |
464 |
|
} |
465 |
|
|
466 |
|
|
467 |
+ |
int |
468 |
|
localhit(r, scene) /* check for hit in the octree */ |
469 |
|
register RAY *r; |
470 |
|
register CUBE *scene; |
612 |
|
} |
613 |
|
|
614 |
|
|
615 |
< |
static |
615 |
> |
static int |
616 |
|
checkhit(r, cu, cxs) /* check for hit in full cube */ |
617 |
|
register RAY *r; |
618 |
|
CUBE *cu; |
626 |
|
checkset(oset, cxs); /* eliminate double-checking */ |
627 |
|
for (i = oset[0]; i > 0; i--) { |
628 |
|
o = objptr(oset[i]); |
629 |
< |
(*ofun[o->otype].funp)(o, r); |
629 |
> |
if ((*ofun[o->otype].funp)(o, r)) |
630 |
> |
r->robj = oset[i]; |
631 |
|
} |
632 |
|
if (r->ro == NULL) |
633 |
|
return(0); /* no scores yet */ |
636 |
|
} |
637 |
|
|
638 |
|
|
639 |
< |
static |
639 |
> |
static void |
640 |
|
checkset(os, cs) /* modify checked set and set to check */ |
641 |
|
register OBJECT *os; /* os' = os - cs */ |
642 |
|
register OBJECT *cs; /* cs' = cs + os */ |