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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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* 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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#include "copyright.h" |
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|
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#include "ray.h" |
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|
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#include "source.h" |
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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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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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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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|
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OBJREC Aftplane; /* aft clipping plane object */ |
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|
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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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|
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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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} |
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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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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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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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|
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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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|
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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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|
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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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} |
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|
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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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******/ |
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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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|
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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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|
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|
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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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> |
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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|
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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 */ |
| 276 |
< |
if (backmat ^ foremat) |
| 276 |
> |
if (backmat ^ foremat) { |
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|
if (backmat && coef > FTINY) |
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|
raytrans(&fr); |
| 279 |
|
else if (foremat && coef < 1.0-FTINY) |
| 280 |
|
raytrans(&br); |
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+ |
} |
| 282 |
|
/* mix perturbations */ |
| 283 |
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for (i = 0; i < 3; i++) |
| 284 |
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r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
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|
} |
| 301 |
|
|
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|
|
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< |
double |
| 304 |
< |
raydist(r, flags) /* compute (cumulative) ray distance */ |
| 305 |
< |
register RAY *r; |
| 306 |
< |
register int flags; |
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> |
extern double |
| 304 |
> |
raydist( /* compute (cumulative) ray distance */ |
| 305 |
> |
register RAY *r, |
| 306 |
> |
register int flags |
| 307 |
> |
) |
| 308 |
|
{ |
| 309 |
|
double sum = 0.0; |
| 310 |
|
|
| 316 |
|
} |
| 317 |
|
|
| 318 |
|
|
| 319 |
< |
double |
| 320 |
< |
raynormal(norm, r) /* compute perturbed normal for ray */ |
| 321 |
< |
FVECT norm; |
| 322 |
< |
register RAY *r; |
| 319 |
> |
extern double |
| 320 |
> |
raynormal( /* compute perturbed normal for ray */ |
| 321 |
> |
FVECT norm, |
| 322 |
> |
register RAY *r |
| 323 |
> |
) |
| 324 |
|
{ |
| 325 |
|
double newdot; |
| 326 |
|
register int i; |
| 352 |
|
} |
| 353 |
|
|
| 354 |
|
|
| 355 |
< |
void |
| 356 |
< |
newrayxf(r) /* get new tranformation matrix for ray */ |
| 357 |
< |
RAY *r; |
| 355 |
> |
extern void |
| 356 |
> |
newrayxf( /* get new tranformation matrix for ray */ |
| 357 |
> |
RAY *r |
| 358 |
> |
) |
| 359 |
|
{ |
| 360 |
|
static struct xfn { |
| 361 |
|
struct xfn *next; |
| 390 |
|
} |
| 391 |
|
|
| 392 |
|
|
| 393 |
< |
void |
| 394 |
< |
flipsurface(r) /* reverse surface orientation */ |
| 395 |
< |
register RAY *r; |
| 393 |
> |
extern void |
| 394 |
> |
flipsurface( /* reverse surface orientation */ |
| 395 |
> |
register RAY *r |
| 396 |
> |
) |
| 397 |
|
{ |
| 398 |
|
r->rod = -r->rod; |
| 399 |
|
r->ron[0] = -r->ron[0]; |
| 405 |
|
} |
| 406 |
|
|
| 407 |
|
|
| 408 |
< |
int |
| 409 |
< |
localhit(r, scene) /* check for hit in the octree */ |
| 410 |
< |
register RAY *r; |
| 411 |
< |
register CUBE *scene; |
| 408 |
> |
extern void |
| 409 |
> |
rayhit( /* standard ray hit test */ |
| 410 |
> |
OBJECT *oset, |
| 411 |
> |
RAY *r |
| 412 |
> |
) |
| 413 |
|
{ |
| 414 |
+ |
OBJREC *o; |
| 415 |
+ |
int i; |
| 416 |
+ |
|
| 417 |
+ |
for (i = oset[0]; i > 0; i--) { |
| 418 |
+ |
o = objptr(oset[i]); |
| 419 |
+ |
if ((*ofun[o->otype].funp)(o, r)) |
| 420 |
+ |
r->robj = oset[i]; |
| 421 |
+ |
} |
| 422 |
+ |
} |
| 423 |
+ |
|
| 424 |
+ |
|
| 425 |
+ |
extern int |
| 426 |
+ |
localhit( /* check for hit in the octree */ |
| 427 |
+ |
register RAY *r, |
| 428 |
+ |
register CUBE *scene |
| 429 |
+ |
) |
| 430 |
+ |
{ |
| 431 |
|
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
| 432 |
|
FVECT curpos; /* current cube position */ |
| 433 |
|
int sflags; /* sign flags */ |
| 481 |
|
} |
| 482 |
|
cxset[0] = 0; |
| 483 |
|
raymove(curpos, cxset, sflags, r, scene); |
| 484 |
< |
return(r->ro != NULL & r->ro != &Aftplane); |
| 484 |
> |
return((r->ro != NULL) & (r->ro != &Aftplane)); |
| 485 |
|
} |
| 486 |
|
|
| 487 |
|
|
| 488 |
|
static int |
| 489 |
< |
raymove(pos, cxs, dirf, r, cu) /* check for hit as we move */ |
| 490 |
< |
FVECT pos; /* current position, modified herein */ |
| 491 |
< |
OBJECT *cxs; /* checked objects, modified by checkhit */ |
| 492 |
< |
int dirf; /* direction indicators to speed tests */ |
| 493 |
< |
register RAY *r; |
| 494 |
< |
register CUBE *cu; |
| 489 |
> |
raymove( /* check for hit as we move */ |
| 490 |
> |
FVECT pos, /* current position, modified herein */ |
| 491 |
> |
OBJECT *cxs, /* checked objects, modified by checkhit */ |
| 492 |
> |
int dirf, /* direction indicators to speed tests */ |
| 493 |
> |
register RAY *r, |
| 494 |
> |
register CUBE *cu |
| 495 |
> |
) |
| 496 |
|
{ |
| 497 |
|
int ax; |
| 498 |
|
double dt, t; |
| 573 |
|
|
| 574 |
|
|
| 575 |
|
static int |
| 576 |
< |
checkhit(r, cu, cxs) /* check for hit in full cube */ |
| 577 |
< |
register RAY *r; |
| 578 |
< |
CUBE *cu; |
| 579 |
< |
OBJECT *cxs; |
| 576 |
> |
checkhit( /* check for hit in full cube */ |
| 577 |
> |
register RAY *r, |
| 578 |
> |
CUBE *cu, |
| 579 |
> |
OBJECT *cxs |
| 580 |
> |
) |
| 581 |
|
{ |
| 582 |
|
OBJECT oset[MAXSET+1]; |
| 622 |
– |
register OBJREC *o; |
| 623 |
– |
register int i; |
| 583 |
|
|
| 584 |
|
objset(oset, cu->cutree); |
| 585 |
< |
checkset(oset, cxs); /* eliminate double-checking */ |
| 586 |
< |
for (i = oset[0]; i > 0; i--) { |
| 587 |
< |
o = objptr(oset[i]); |
| 588 |
< |
if ((*ofun[o->otype].funp)(o, r)) |
| 589 |
< |
r->robj = oset[i]; |
| 631 |
< |
} |
| 632 |
< |
if (r->ro == NULL) |
| 585 |
> |
checkset(oset, cxs); /* avoid double-checking */ |
| 586 |
> |
|
| 587 |
> |
(*r->hitf)(oset, r); /* test for hit in set */ |
| 588 |
> |
|
| 589 |
> |
if (r->robj == OVOID) |
| 590 |
|
return(0); /* no scores yet */ |
| 591 |
|
|
| 592 |
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
| 594 |
|
|
| 595 |
|
|
| 596 |
|
static void |
| 597 |
< |
checkset(os, cs) /* modify checked set and set to check */ |
| 598 |
< |
register OBJECT *os; /* os' = os - cs */ |
| 599 |
< |
register OBJECT *cs; /* cs' = cs + os */ |
| 597 |
> |
checkset( /* modify checked set and set to check */ |
| 598 |
> |
register OBJECT *os, /* os' = os - cs */ |
| 599 |
> |
register OBJECT *cs /* cs' = cs + os */ |
| 600 |
> |
) |
| 601 |
|
{ |
| 602 |
|
OBJECT cset[MAXCSET+MAXSET+1]; |
| 603 |
|
register int i, j; |
