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greg |
1.1 |
#ifndef lint |
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greg |
2.8 |
static const char RCSid[] = "$Id$"; |
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greg |
1.1 |
#endif |
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/* |
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* Routines for light-redirecting materials and |
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* their associated virtual light sources |
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*/ |
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greg |
2.9 |
#include "copyright.h" |
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greg |
2.8 |
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greg |
1.1 |
#include "ray.h" |
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#include "otypes.h" |
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#include "source.h" |
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greg |
2.2 |
#include "func.h" |
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greg |
1.1 |
/* |
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* The arguments for MAT_DIRECT1 are: |
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* |
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greg |
1.3 |
* 5+ coef1 dx1 dy1 dz1 funcfile transform.. |
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greg |
1.1 |
* 0 |
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* n A1 A2 .. An |
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* |
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* The arguments for MAT_DIRECT2 are: |
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* |
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greg |
1.3 |
* 9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform.. |
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greg |
1.1 |
* 0 |
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* n A1 A2 .. An |
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*/ |
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greg |
2.8 |
static int dir_proj(); |
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greg |
1.1 |
VSMATERIAL direct1_vs = {dir_proj, 1}; |
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VSMATERIAL direct2_vs = {dir_proj, 2}; |
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greg |
2.2 |
#define getdfunc(m) ( (m)->otype == MAT_DIRECT1 ? \ |
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getfunc(m, 4, 0xf, 1) : \ |
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getfunc(m, 8, 0xff, 1) ) |
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greg |
1.1 |
|
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greg |
1.6 |
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greg |
2.8 |
int |
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greg |
1.1 |
m_direct(m, r) /* shade redirected ray */ |
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register OBJREC *m; |
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register RAY *r; |
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{ |
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/* check if source ray */ |
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if (r->rsrc >= 0 && source[r->rsrc].so != r->ro) |
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greg |
2.4 |
return(1); /* got the wrong guy */ |
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greg |
1.1 |
/* compute first projection */ |
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if (m->otype == MAT_DIRECT1 || |
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(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 0)) |
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redirect(m, r, 0); |
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/* compute second projection */ |
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if (m->otype == MAT_DIRECT2 && |
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(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 1)) |
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redirect(m, r, 1); |
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greg |
2.4 |
return(1); |
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greg |
1.1 |
} |
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greg |
2.8 |
int |
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greg |
1.1 |
redirect(m, r, n) /* compute n'th ray redirection */ |
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OBJREC *m; |
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RAY *r; |
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int n; |
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{ |
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greg |
2.2 |
MFUNC *mf; |
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register EPNODE **va; |
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greg |
2.3 |
FVECT nsdir; |
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greg |
1.1 |
RAY nr; |
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double coef; |
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register int j; |
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/* set up function */ |
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greg |
2.2 |
mf = getdfunc(m); |
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setfunc(m, r); |
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greg |
2.3 |
/* assign direction variable */ |
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if (r->rsrc >= 0) { |
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register SRCREC *sp = source + source[r->rsrc].sa.sv.sn; |
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if (sp->sflags & SDISTANT) |
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VCOPY(nsdir, sp->sloc); |
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else { |
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for (j = 0; j < 3; j++) |
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nsdir[j] = sp->sloc[j] - r->rop[j]; |
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normalize(nsdir); |
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} |
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greg |
2.6 |
multv3(nsdir, nsdir, funcxf.xfm); |
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varset("DxA", '=', nsdir[0]/funcxf.sca); |
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varset("DyA", '=', nsdir[1]/funcxf.sca); |
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varset("DzA", '=', nsdir[2]/funcxf.sca); |
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} else { |
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varset("DxA", '=', 0.0); |
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varset("DyA", '=', 0.0); |
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varset("DzA", '=', 0.0); |
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} |
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greg |
1.1 |
/* compute coefficient */ |
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errno = 0; |
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greg |
2.2 |
va = mf->ep + 4*n; |
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coef = evalue(va[0]); |
103 |
greg |
1.1 |
if (errno) |
104 |
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goto computerr; |
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if (coef <= FTINY || rayorigin(&nr, r, TRANS, coef) < 0) |
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return(0); |
107 |
greg |
2.2 |
va++; /* compute direction */ |
108 |
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for (j = 0; j < 3; j++) { |
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nr.rdir[j] = evalue(va[j]); |
110 |
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if (errno) |
111 |
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goto computerr; |
112 |
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} |
113 |
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if (mf->f != &unitxf) |
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multv3(nr.rdir, nr.rdir, mf->f->xfm); |
115 |
greg |
1.4 |
if (r->rox != NULL) |
116 |
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multv3(nr.rdir, nr.rdir, r->rox->f.xfm); |
117 |
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if (normalize(nr.rdir) == 0.0) |
118 |
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goto computerr; |
119 |
greg |
1.1 |
/* compute value */ |
120 |
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if (r->rsrc >= 0) |
121 |
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nr.rsrc = source[r->rsrc].sa.sv.sn; |
122 |
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rayvalue(&nr); |
123 |
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scalecolor(nr.rcol, coef); |
124 |
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addcolor(r->rcol, nr.rcol); |
125 |
greg |
2.7 |
if (r->ro != NULL && isflat(r->ro->otype)) |
126 |
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r->rt = r->rot + nr.rt; |
127 |
greg |
1.1 |
return(1); |
128 |
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computerr: |
129 |
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objerror(m, WARNING, "compute error"); |
130 |
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return(-1); |
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} |
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133 |
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134 |
greg |
2.8 |
static int |
135 |
greg |
1.1 |
dir_proj(pm, o, s, n) /* compute a director's projection */ |
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MAT4 pm; |
137 |
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OBJREC *o; |
138 |
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SRCREC *s; |
139 |
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int n; |
140 |
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{ |
141 |
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RAY tr; |
142 |
greg |
2.2 |
OBJREC *m; |
143 |
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MFUNC *mf; |
144 |
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EPNODE **va; |
145 |
greg |
1.1 |
FVECT cent, newdir, nv, h; |
146 |
greg |
2.2 |
double coef, olddot, newdot, od; |
147 |
greg |
1.1 |
register int i, j; |
148 |
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/* initialize test ray */ |
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getmaxdisk(cent, o); |
150 |
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if (s->sflags & SDISTANT) |
151 |
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for (i = 0; i < 3; i++) { |
152 |
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tr.rdir[i] = -s->sloc[i]; |
153 |
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tr.rorg[i] = cent[i] - tr.rdir[i]; |
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} |
155 |
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else { |
156 |
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for (i = 0; i < 3; i++) { |
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tr.rdir[i] = cent[i] - s->sloc[i]; |
158 |
greg |
1.2 |
tr.rorg[i] = s->sloc[i]; |
159 |
greg |
1.1 |
} |
160 |
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if (normalize(tr.rdir) == 0.0) |
161 |
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return(0); /* at source! */ |
162 |
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} |
163 |
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od = getplaneq(nv, o); |
164 |
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olddot = DOT(tr.rdir, nv); |
165 |
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if (olddot <= FTINY && olddot >= -FTINY) |
166 |
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return(0); /* old dir parallels plane */ |
167 |
greg |
2.5 |
tr.rmax = 0.0; |
168 |
greg |
1.1 |
rayorigin(&tr, NULL, PRIMARY, 1.0); |
169 |
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if (!(*ofun[o->otype].funp)(o, &tr)) |
170 |
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return(0); /* no intersection! */ |
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/* compute redirection */ |
172 |
greg |
2.2 |
m = vsmaterial(o); |
173 |
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mf = getdfunc(m); |
174 |
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setfunc(m, &tr); |
175 |
greg |
2.3 |
varset("DxA", '=', 0.0); |
176 |
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varset("DyA", '=', 0.0); |
177 |
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varset("DzA", '=', 0.0); |
178 |
greg |
1.1 |
errno = 0; |
179 |
greg |
2.2 |
va = mf->ep + 4*n; |
180 |
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coef = evalue(va[0]); |
181 |
greg |
1.1 |
if (errno) |
182 |
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goto computerr; |
183 |
greg |
2.2 |
if (coef <= FTINY) |
184 |
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return(0); /* insignificant */ |
185 |
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va++; |
186 |
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for (i = 0; i < 3; i++) { |
187 |
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newdir[i] = evalue(va[i]); |
188 |
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if (errno) |
189 |
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goto computerr; |
190 |
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} |
191 |
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if (mf->f != &unitxf) |
192 |
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multv3(newdir, newdir, mf->f->xfm); |
193 |
greg |
1.4 |
/* normalization unnecessary */ |
194 |
greg |
1.1 |
newdot = DOT(newdir, nv); |
195 |
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if (newdot <= FTINY && newdot >= -FTINY) |
196 |
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return(0); /* new dir parallels plane */ |
197 |
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/* everything OK -- compute shear */ |
198 |
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for (i = 0; i < 3; i++) |
199 |
greg |
1.4 |
h[i] = newdir[i]/newdot - tr.rdir[i]/olddot; |
200 |
greg |
1.1 |
setident4(pm); |
201 |
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for (j = 0; j < 3; j++) { |
202 |
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for (i = 0; i < 3; i++) |
203 |
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pm[i][j] += nv[i]*h[j]; |
204 |
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pm[3][j] = -od*h[j]; |
205 |
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} |
206 |
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if (newdot > 0.0 ^ olddot > 0.0) /* add mirroring */ |
207 |
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for (j = 0; j < 3; j++) { |
208 |
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for (i = 0; i < 3; i++) |
209 |
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pm[i][j] -= 2.*nv[i]*nv[j]; |
210 |
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pm[3][j] += 2.*od*nv[j]; |
211 |
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} |
212 |
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return(1); |
213 |
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computerr: |
214 |
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objerror(m, WARNING, "projection compute error"); |
215 |
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return(0); |
216 |
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} |