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/* Copyright (c) 1991 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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* Support routines for source objects and materials |
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* |
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* External symbols declared in source.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 "otypes.h" |
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|
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#include "face.h" |
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|
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#define SRCINC 4 /* realloc increment for array */ |
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|
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SRCREC *source = NULL; /* our list of sources */ |
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int nsources = 0; /* the number of sources */ |
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SRCFUNC sfun[NUMOTYPE]; /* source dispatch table */ |
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|
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|
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void |
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initstypes() /* initialize source dispatch table */ |
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{ |
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extern VSMATERIAL mirror_vs, direct1_vs, direct2_vs; |
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< |
extern int fsetsrc(), ssetsrc(), sphsetsrc(), rsetsrc(); |
90 |
< |
extern double fgetplaneq(), rgetplaneq(); |
91 |
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extern double fgetmaxdisk(), rgetmaxdisk(); |
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< |
static SOBJECT fsobj = {fsetsrc, fgetplaneq, fgetmaxdisk}; |
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< |
static SOBJECT ssobj = {ssetsrc}; |
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< |
static SOBJECT sphsobj = {sphsetsrc}; |
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static SOBJECT rsobj = {rsetsrc, rgetplaneq, rgetmaxdisk}; |
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> |
static SOBJECT fsobj = {fsetsrc, flatpart, fgetplaneq, fgetmaxdisk}; |
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static SOBJECT ssobj = {ssetsrc, nopart}; |
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static SOBJECT sphsobj = {sphsetsrc, nopart}; |
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static SOBJECT cylsobj = {cylsetsrc, cylpart}; |
93 |
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static SOBJECT rsobj = {rsetsrc, flatpart, rgetplaneq, rgetmaxdisk}; |
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|
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sfun[MAT_MIRROR].mf = &mirror_vs; |
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sfun[MAT_DIRECT1].mf = &direct1_vs; |
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sfun[OBJ_FACE].of = &fsobj; |
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sfun[OBJ_SOURCE].of = &ssobj; |
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sfun[OBJ_SPHERE].of = &sphsobj; |
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sfun[OBJ_CYLINDER].of = &cylsobj; |
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sfun[OBJ_RING].of = &rsobj; |
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} |
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|
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newsource() /* allocate new source in our array */ |
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{ |
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if (nsources == 0) |
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< |
source = (SRCREC *)malloc(sizeof(SRCREC)); |
111 |
< |
else |
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> |
source = (SRCREC *)malloc(SRCINC*sizeof(SRCREC)); |
111 |
> |
else if (nsources%SRCINC == 0) |
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source = (SRCREC *)realloc((char *)source, |
113 |
< |
(unsigned)(nsources+1)*sizeof(SRCREC)); |
113 |
> |
(unsigned)(nsources+SRCINC)*sizeof(SRCREC)); |
114 |
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if (source == NULL) |
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return(-1); |
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source[nsources].sflags = 0; |
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} |
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|
122 |
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|
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void |
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+ |
setflatss(src) /* set sampling for a flat source */ |
125 |
+ |
register SRCREC *src; |
126 |
+ |
{ |
127 |
+ |
double mult; |
128 |
+ |
register int i; |
129 |
+ |
|
130 |
+ |
src->ss[SV][0] = src->ss[SV][1] = src->ss[SV][2] = 0.0; |
131 |
+ |
for (i = 0; i < 3; i++) |
132 |
+ |
if (src->snorm[i] < 0.6 && src->snorm[i] > -0.6) |
133 |
+ |
break; |
134 |
+ |
src->ss[SV][i] = 1.0; |
135 |
+ |
fcross(src->ss[SU], src->ss[SV], src->snorm); |
136 |
+ |
mult = .5 * sqrt( src->ss2 / DOT(src->ss[SU],src->ss[SU]) ); |
137 |
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for (i = 0; i < 3; i++) |
138 |
+ |
src->ss[SU][i] *= mult; |
139 |
+ |
fcross(src->ss[SV], src->snorm, src->ss[SU]); |
140 |
+ |
} |
141 |
+ |
|
142 |
+ |
|
143 |
+ |
void |
144 |
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fsetsrc(src, so) /* set a face as a source */ |
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register SRCREC *src; |
146 |
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OBJREC *so; |
147 |
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{ |
148 |
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register FACE *f; |
149 |
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register int i, j; |
150 |
+ |
double d; |
151 |
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|
152 |
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src->sa.success = 2*AIMREQT-1; /* bitch on second failure */ |
153 |
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src->so = so; |
164 |
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objerror(so, USER, "cannot hit center"); |
165 |
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src->sflags |= SFLAT; |
166 |
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VCOPY(src->snorm, f->norm); |
88 |
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src->ss = sqrt(f->area / PI); |
167 |
|
src->ss2 = f->area; |
168 |
+ |
/* find maximum radius */ |
169 |
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src->srad = 0.; |
170 |
+ |
for (i = 0; i < f->nv; i++) { |
171 |
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d = dist2(VERTEX(f,i), src->sloc); |
172 |
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if (d > src->srad) |
173 |
+ |
src->srad = d; |
174 |
+ |
} |
175 |
+ |
src->srad = sqrt(src->srad); |
176 |
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/* compute size vectors */ |
177 |
+ |
if (f->nv == 4) /* parallelogram case */ |
178 |
+ |
for (j = 0; j < 3; j++) { |
179 |
+ |
src->ss[SU][j] = .5*(VERTEX(f,1)[j]-VERTEX(f,0)[j]); |
180 |
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src->ss[SV][j] = .5*(VERTEX(f,3)[j]-VERTEX(f,0)[j]); |
181 |
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} |
182 |
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else |
183 |
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setflatss(src); |
184 |
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} |
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|
186 |
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|
187 |
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void |
188 |
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ssetsrc(src, so) /* set a source as a source */ |
189 |
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register SRCREC *src; |
190 |
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register OBJREC *so; |
202 |
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theta = PI/180.0/2.0 * so->oargs.farg[3]; |
203 |
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if (theta <= FTINY) |
204 |
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objerror(so, USER, "zero size"); |
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– |
src->ss = theta >= PI/4.0 ? 1.0 : tan(theta); |
205 |
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src->ss2 = 2.0*PI * (1.0 - cos(theta)); |
206 |
+ |
/* the following is approximate */ |
207 |
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src->srad = sqrt(src->ss2/PI); |
208 |
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VCOPY(src->snorm, src->sloc); |
209 |
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setflatss(src); /* hey, whatever works */ |
210 |
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src->ss[SW][0] = src->ss[SW][1] = src->ss[SW][2] = 0.0; |
211 |
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} |
212 |
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|
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|
214 |
+ |
void |
215 |
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sphsetsrc(src, so) /* set a sphere as a source */ |
216 |
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register SRCREC *src; |
217 |
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register OBJREC *so; |
218 |
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{ |
219 |
+ |
register int i; |
220 |
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|
221 |
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src->sa.success = 2*AIMREQT-1; /* bitch on second failure */ |
222 |
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src->so = so; |
223 |
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if (so->oargs.nfargs != 4) |
225 |
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if (so->oargs.farg[3] <= FTINY) |
226 |
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objerror(so, USER, "illegal radius"); |
227 |
|
VCOPY(src->sloc, so->oargs.farg); |
228 |
< |
src->ss = so->oargs.farg[3]; |
229 |
< |
src->ss2 = PI * src->ss * src->ss; |
228 |
> |
src->srad = so->oargs.farg[3]; |
229 |
> |
src->ss2 = PI * src->srad * src->srad; |
230 |
> |
for (i = 0; i < 3; i++) |
231 |
> |
src->ss[SU][i] = src->ss[SV][i] = src->ss[SW][i] = 0.0; |
232 |
> |
for (i = 0; i < 3; i++) |
233 |
> |
src->ss[i][i] = .7236 * so->oargs.farg[3]; |
234 |
|
} |
235 |
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|
236 |
|
|
237 |
+ |
void |
238 |
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rsetsrc(src, so) /* set a ring (disk) as a source */ |
239 |
|
register SRCREC *src; |
240 |
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OBJREC *so; |
250 |
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objerror(so, USER, "cannot hit center"); |
251 |
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src->sflags |= SFLAT; |
252 |
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VCOPY(src->snorm, co->ad); |
253 |
< |
src->ss = CO_R1(co); |
254 |
< |
src->ss2 = PI * src->ss * src->ss; |
253 |
> |
src->srad = CO_R1(co); |
254 |
> |
src->ss2 = PI * src->srad * src->srad; |
255 |
> |
setflatss(src); |
256 |
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} |
257 |
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|
258 |
|
|
259 |
+ |
void |
260 |
+ |
cylsetsrc(src, so) /* set a cylinder as a source */ |
261 |
+ |
register SRCREC *src; |
262 |
+ |
OBJREC *so; |
263 |
+ |
{ |
264 |
+ |
register CONE *co; |
265 |
+ |
register int i; |
266 |
+ |
|
267 |
+ |
src->sa.success = 4*AIMREQT-1; /* bitch on fourth failure */ |
268 |
+ |
src->so = so; |
269 |
+ |
/* get the cylinder */ |
270 |
+ |
co = getcone(so, 0); |
271 |
+ |
if (CO_R0(co) > .2*co->al) /* heuristic constraint */ |
272 |
+ |
objerror(so, WARNING, "source aspect too small"); |
273 |
+ |
src->sflags |= SCYL; |
274 |
+ |
for (i = 0; i < 3; i++) |
275 |
+ |
src->sloc[i] = .5 * (CO_P1(co)[i] + CO_P0(co)[i]); |
276 |
+ |
src->srad = .5*co->al; |
277 |
+ |
src->ss2 = 2.*CO_R0(co)*co->al; |
278 |
+ |
/* set sampling vectors */ |
279 |
+ |
for (i = 0; i < 3; i++) |
280 |
+ |
src->ss[SU][i] = .5 * co->al * co->ad[i]; |
281 |
+ |
src->ss[SV][0] = src->ss[SV][1] = src->ss[SV][2] = 0.0; |
282 |
+ |
for (i = 0; i < 3; i++) |
283 |
+ |
if (co->ad[i] < 0.6 && co->ad[i] > -0.6) |
284 |
+ |
break; |
285 |
+ |
src->ss[SV][i] = 1.0; |
286 |
+ |
fcross(src->ss[SW], src->ss[SV], co->ad); |
287 |
+ |
normalize(src->ss[SW]); |
288 |
+ |
for (i = 0; i < 3; i++) |
289 |
+ |
src->ss[SW][i] *= .8559 * CO_R0(co); |
290 |
+ |
fcross(src->ss[SV], src->ss[SW], co->ad); |
291 |
+ |
} |
292 |
+ |
|
293 |
+ |
|
294 |
|
SPOT * |
295 |
|
makespot(m) /* make a spotlight */ |
296 |
|
register OBJREC *m; |
297 |
|
{ |
298 |
|
register SPOT *ns; |
299 |
|
|
300 |
+ |
if ((ns = (SPOT *)m->os) != NULL) |
301 |
+ |
return(ns); |
302 |
|
if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
303 |
|
return(NULL); |
304 |
|
ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3])); |
305 |
|
VCOPY(ns->aim, m->oargs.farg+4); |
306 |
|
if ((ns->flen = normalize(ns->aim)) == 0.0) |
307 |
|
objerror(m, USER, "zero focus vector"); |
308 |
+ |
m->os = (char *)ns; |
309 |
|
return(ns); |
310 |
|
} |
311 |
|
|
312 |
|
|
313 |
+ |
int |
314 |
+ |
spotout(r, s) /* check if we're outside spot region */ |
315 |
+ |
register RAY *r; |
316 |
+ |
register SPOT *s; |
317 |
+ |
{ |
318 |
+ |
double d; |
319 |
+ |
FVECT vd; |
320 |
+ |
|
321 |
+ |
if (s == NULL) |
322 |
+ |
return(0); |
323 |
+ |
if (s->flen < -FTINY) { /* distant source */ |
324 |
+ |
vd[0] = s->aim[0] - r->rorg[0]; |
325 |
+ |
vd[1] = s->aim[1] - r->rorg[1]; |
326 |
+ |
vd[2] = s->aim[2] - r->rorg[2]; |
327 |
+ |
d = DOT(r->rdir,vd); |
328 |
+ |
/* wrong side? |
329 |
+ |
if (d <= FTINY) |
330 |
+ |
return(1); */ |
331 |
+ |
d = DOT(vd,vd) - d*d; |
332 |
+ |
if (PI*d > s->siz) |
333 |
+ |
return(1); /* out */ |
334 |
+ |
return(0); /* OK */ |
335 |
+ |
} |
336 |
+ |
/* local source */ |
337 |
+ |
if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir))) |
338 |
+ |
return(1); /* out */ |
339 |
+ |
return(0); /* OK */ |
340 |
+ |
} |
341 |
+ |
|
342 |
+ |
|
343 |
|
double |
344 |
|
fgetmaxdisk(ocent, op) /* get center and squared radius of face */ |
345 |
|
FVECT ocent; |
411 |
|
} |
412 |
|
|
413 |
|
|
414 |
+ |
int |
415 |
|
commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
416 |
|
register SPOT *sp1, *sp2; |
417 |
|
FVECT org; |
435 |
|
} |
436 |
|
|
437 |
|
|
438 |
+ |
int |
439 |
|
commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
440 |
|
register SPOT *sp1, *sp2; |
441 |
|
FVECT dir; |
460 |
|
} |
461 |
|
|
462 |
|
|
463 |
+ |
int |
464 |
|
checkspot(sp, nrm) /* check spotlight for behind source */ |
465 |
|
register SPOT *sp; /* spotlight */ |
466 |
|
FVECT nrm; /* source surface normal */ |
556 |
|
for (i = 0; i < 3; i++) |
557 |
|
cc[i] = c1[i] + l*disp[i]; |
558 |
|
return(a2); |
380 |
– |
} |
381 |
– |
|
382 |
– |
|
383 |
– |
sourcehit(r) /* check to see if ray hit distant source */ |
384 |
– |
register RAY *r; |
385 |
– |
{ |
386 |
– |
int first, last; |
387 |
– |
register int i; |
388 |
– |
|
389 |
– |
if (r->rsrc >= 0) { /* check only one if aimed */ |
390 |
– |
first = last = r->rsrc; |
391 |
– |
} else { /* otherwise check all */ |
392 |
– |
first = 0; last = nsources-1; |
393 |
– |
} |
394 |
– |
for (i = first; i <= last; i++) |
395 |
– |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
396 |
– |
/* |
397 |
– |
* Check to see if ray is within |
398 |
– |
* solid angle of source. |
399 |
– |
*/ |
400 |
– |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
401 |
– |
<= source[i].ss2) { |
402 |
– |
r->ro = source[i].so; |
403 |
– |
if (!(source[i].sflags & SSKIP)) |
404 |
– |
break; |
405 |
– |
} |
406 |
– |
|
407 |
– |
if (r->ro != NULL) { |
408 |
– |
for (i = 0; i < 3; i++) |
409 |
– |
r->ron[i] = -r->rdir[i]; |
410 |
– |
r->rod = 1.0; |
411 |
– |
r->rox = NULL; |
412 |
– |
return(1); |
413 |
– |
} |
414 |
– |
return(0); |
415 |
– |
} |
416 |
– |
|
417 |
– |
|
418 |
– |
#define wrongsource(m, r) (r->rsrc>=0 && \ |
419 |
– |
source[r->rsrc].so!=r->ro && \ |
420 |
– |
(m->otype!=MAT_ILLUM || \ |
421 |
– |
objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM)) |
422 |
– |
|
423 |
– |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
424 |
– |
r->rot > m->oargs.farg[3]) |
425 |
– |
|
426 |
– |
#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
427 |
– |
!distglow(m, r)) |
428 |
– |
|
429 |
– |
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
430 |
– |
!(r->rsrc>=0&&source[r->rsrc].so==r->ro)) |
431 |
– |
|
432 |
– |
#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
433 |
– |
!distglow(m, r)) |
434 |
– |
|
435 |
– |
|
436 |
– |
m_light(m, r) /* ray hit a light source */ |
437 |
– |
register OBJREC *m; |
438 |
– |
register RAY *r; |
439 |
– |
{ |
440 |
– |
/* check for over-counting */ |
441 |
– |
if (wrongsource(m, r) || badambient(m, r)) |
442 |
– |
return; |
443 |
– |
/* check for passed illum */ |
444 |
– |
if (passillum(m, r)) { |
445 |
– |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
446 |
– |
raytrans(r); |
447 |
– |
else |
448 |
– |
rayshade(r, modifier(m->oargs.sarg[0])); |
449 |
– |
return; |
450 |
– |
} |
451 |
– |
/* otherwise treat as source */ |
452 |
– |
/* check for behind */ |
453 |
– |
if (r->rod < 0.0) |
454 |
– |
return; |
455 |
– |
/* check for invisibility */ |
456 |
– |
if (srcignore(m, r)) |
457 |
– |
return; |
458 |
– |
/* get distribution pattern */ |
459 |
– |
raytexture(r, m->omod); |
460 |
– |
/* get source color */ |
461 |
– |
setcolor(r->rcol, m->oargs.farg[0], |
462 |
– |
m->oargs.farg[1], |
463 |
– |
m->oargs.farg[2]); |
464 |
– |
/* modify value */ |
465 |
– |
multcolor(r->rcol, r->pcol); |
559 |
|
} |