1 |
– |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
– |
|
1 |
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
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#endif |
6 |
– |
|
4 |
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/* |
5 |
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* func.c - interface to calcomp functions. |
9 |
– |
* |
10 |
– |
* 4/7/86 |
6 |
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*/ |
7 |
|
|
8 |
< |
#include "ray.h" |
8 |
> |
#include "copyright.h" |
9 |
|
|
10 |
+ |
#include "ray.h" |
11 |
+ |
#include "paths.h" |
12 |
|
#include "otypes.h" |
13 |
+ |
#include "func.h" |
14 |
+ |
#include <ctype.h> |
15 |
|
|
16 |
|
|
17 |
+ |
#define INITFILE "rayinit.cal" |
18 |
+ |
#define CALSUF ".cal" |
19 |
+ |
#define LCALSUF 4 |
20 |
+ |
char REFVNAME[] = "`FILE_REFCNT"; |
21 |
+ |
|
22 |
|
XF unitxf = { /* identity transform */ |
23 |
< |
1.0, 0.0, 0.0, 0.0, |
24 |
< |
0.0, 1.0, 0.0, 0.0, |
25 |
< |
0.0, 0.0, 1.0, 0.0, |
26 |
< |
0.0, 0.0, 0.0, 1.0, |
23 |
> |
{{1.0, 0.0, 0.0, 0.0}, |
24 |
> |
{0.0, 1.0, 0.0, 0.0}, |
25 |
> |
{0.0, 0.0, 1.0, 0.0}, |
26 |
> |
{0.0, 0.0, 0.0, 1.0}}, |
27 |
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1.0 |
28 |
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}; |
29 |
|
|
31 |
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static OBJREC *fobj = NULL; /* current function object */ |
32 |
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static RAY *fray = NULL; /* current function ray */ |
33 |
|
|
34 |
+ |
static char rayinitcal[] = INITFILE; |
35 |
|
|
36 |
< |
setmap(m, r, bx) /* set channels for function call */ |
37 |
< |
OBJREC *m; |
38 |
< |
register RAY *r; |
39 |
< |
XF *bx; |
36 |
> |
static double l_erf(char *), l_erfc(char *), l_arg(char *); |
37 |
> |
|
38 |
> |
|
39 |
> |
void |
40 |
> |
initfunc(void) /* initialize function evaluation */ |
41 |
|
{ |
42 |
< |
extern double l_arg(), l_erf(), l_erfc(); |
43 |
< |
extern long eclock; |
44 |
< |
static char *initfile = "rayinit.cal"; |
45 |
< |
static long lastrno = -1; |
46 |
< |
/* check to see if already set */ |
47 |
< |
if (m == fobj && r->rno == lastrno) |
48 |
< |
return(0); |
49 |
< |
/* initialize if first call */ |
50 |
< |
if (initfile != NULL) { |
51 |
< |
loadfunc(initfile); |
52 |
< |
scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0); |
53 |
< |
scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0); |
54 |
< |
scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0); |
55 |
< |
scompile("T=$10;Rdot=$11;", NULL, 0); |
56 |
< |
scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0); |
57 |
< |
scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0); |
58 |
< |
scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0); |
59 |
< |
scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0); |
60 |
< |
funset("arg", 1, '=', l_arg); |
61 |
< |
funset("erf", 1, ':', l_erf); |
62 |
< |
funset("erfc", 1, ':', l_erfc); |
63 |
< |
setnoisefuncs(); |
64 |
< |
initfile = NULL; |
42 |
> |
if (!rayinitcal[0]) /* already done? */ |
43 |
> |
return; |
44 |
> |
esupport |= E_VARIABLE|E_FUNCTION|E_INCHAN|E_RCONST|E_REDEFW; |
45 |
> |
esupport &= ~(E_OUTCHAN); |
46 |
> |
setcontext(""); |
47 |
> |
scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0); |
48 |
> |
scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0); |
49 |
> |
scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0); |
50 |
> |
scompile("T=$10;Ts=$25;Rdot=$11;", NULL, 0); |
51 |
> |
scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0); |
52 |
> |
scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0); |
53 |
> |
scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0); |
54 |
> |
scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0); |
55 |
> |
scompile("Lu=$26;Lv=$27;", NULL, 0); |
56 |
> |
funset("arg", 1, '=', l_arg); |
57 |
> |
funset("erf", 1, ':', l_erf); |
58 |
> |
funset("erfc", 1, ':', l_erfc); |
59 |
> |
setnoisefuncs(); |
60 |
> |
setprismfuncs(); |
61 |
> |
loadfunc(rayinitcal); |
62 |
> |
rayinitcal[0] = '\0'; |
63 |
> |
} |
64 |
> |
|
65 |
> |
|
66 |
> |
/* Set parameters for current evaluation */ |
67 |
> |
void |
68 |
> |
set_eparams(char *prms) |
69 |
> |
{ |
70 |
> |
static char *last_params; |
71 |
> |
static int lplen = 0; |
72 |
> |
int len; |
73 |
> |
char vname[RMAXWORD]; |
74 |
> |
double value; |
75 |
> |
char *cpd; |
76 |
> |
/* check if already set */ |
77 |
> |
if (prms == NULL || !*prms) |
78 |
> |
return; |
79 |
> |
if (lplen && !strcmp(prms, last_params)) |
80 |
> |
return; |
81 |
> |
len = strlen(prms); /* record new settings */ |
82 |
> |
if ((lplen != 0) & (lplen <= len)) { |
83 |
> |
free(last_params); |
84 |
> |
lplen = 0; |
85 |
|
} |
86 |
+ |
if (!lplen) { |
87 |
+ |
lplen = len + 100; |
88 |
+ |
last_params = (char *)malloc(lplen); |
89 |
+ |
if (last_params == NULL) |
90 |
+ |
error(SYSTEM, "out of memory in set_eparams()"); |
91 |
+ |
} |
92 |
+ |
strcpy(last_params, prms); |
93 |
+ |
/* assign each variable */ |
94 |
+ |
while (*prms) { |
95 |
+ |
if (isspace(*prms)) { |
96 |
+ |
++prms; continue; |
97 |
+ |
} |
98 |
+ |
if (!isalpha(*prms)) |
99 |
+ |
goto bad_params; |
100 |
+ |
cpd = vname; |
101 |
+ |
while (*prms && (*prms != '=') & !isspace(*prms)) { |
102 |
+ |
if (!isid(*prms) | (cpd-vname >= RMAXWORD-1)) |
103 |
+ |
goto bad_params; |
104 |
+ |
*cpd++ = *prms++; |
105 |
+ |
} |
106 |
+ |
*cpd = '\0'; |
107 |
+ |
while (isspace(*prms)) prms++; |
108 |
+ |
if (*prms++ != '=') |
109 |
+ |
goto bad_params; |
110 |
+ |
value = atof(prms); |
111 |
+ |
if ((prms = fskip(prms)) == NULL) |
112 |
+ |
goto bad_params; |
113 |
+ |
while (isspace(*prms)) prms++; |
114 |
+ |
prms += (*prms == ',') | (*prms == ';'); |
115 |
+ |
varset(vname, '=', value); |
116 |
+ |
} |
117 |
+ |
eclock++; /* notify expression evaluator */ |
118 |
+ |
return; |
119 |
+ |
bad_params: |
120 |
+ |
sprintf(errmsg, "bad parameter list '%s'", last_params); |
121 |
+ |
error(USER, errmsg); |
122 |
+ |
} |
123 |
+ |
|
124 |
+ |
|
125 |
+ |
MFUNC * |
126 |
+ |
getfunc( /* get function for this modifier */ |
127 |
+ |
OBJREC *m, |
128 |
+ |
int ff, |
129 |
+ |
unsigned int ef, |
130 |
+ |
int dofwd |
131 |
+ |
) |
132 |
+ |
{ |
133 |
+ |
char sbuf[MAXSTR]; |
134 |
+ |
char **arg; |
135 |
+ |
MFUNC *f; |
136 |
+ |
int ne, na; |
137 |
+ |
int i; |
138 |
+ |
/* check to see if done already */ |
139 |
+ |
if ((f = (MFUNC *)m->os) != NULL) |
140 |
+ |
return(f); |
141 |
+ |
fobj = NULL; fray = NULL; |
142 |
+ |
if (rayinitcal[0]) /* initialize on first call */ |
143 |
+ |
initfunc(); |
144 |
+ |
if ((na = m->oargs.nsargs) <= ff) |
145 |
+ |
goto toofew; |
146 |
+ |
arg = m->oargs.sarg; |
147 |
+ |
if ((f = (MFUNC *)calloc(1, sizeof(MFUNC))) == NULL) |
148 |
+ |
goto memerr; |
149 |
+ |
i = strlen(arg[ff]); /* set up context */ |
150 |
+ |
if (i == 1 && arg[ff][0] == '.') { |
151 |
+ |
setcontext(f->ctx = ""); /* "." means no file */ |
152 |
+ |
} else { |
153 |
+ |
strcpy(sbuf,arg[ff]); /* file name is context */ |
154 |
+ |
if (i > LCALSUF && !strcmp(sbuf+i-LCALSUF, CALSUF)) |
155 |
+ |
sbuf[i-LCALSUF] = '\0'; /* remove suffix */ |
156 |
+ |
setcontext(f->ctx = savestr(sbuf)); |
157 |
+ |
if (!vardefined(REFVNAME)) { /* file loaded? */ |
158 |
+ |
loadfunc(arg[ff]); |
159 |
+ |
varset(REFVNAME, '=', 1.0); |
160 |
+ |
} else /* reference_count++ */ |
161 |
+ |
varset(REFVNAME, '=', varvalue(REFVNAME)+1.0); |
162 |
+ |
} |
163 |
+ |
curfunc = NULL; /* parse expressions */ |
164 |
+ |
sprintf(sbuf, "%s \"%s\"", ofun[m->otype].funame, m->oname); |
165 |
+ |
for (i=0, ne=0; ef && i < na; i++, ef>>=1) |
166 |
+ |
if (ef & 1) { /* flagged as an expression? */ |
167 |
+ |
if (ne >= MAXEXPR) |
168 |
+ |
objerror(m, INTERNAL, "too many expressions"); |
169 |
+ |
initstr(arg[i], sbuf, 0); |
170 |
+ |
f->ep[ne++] = getE1(); |
171 |
+ |
if (nextc != EOF) |
172 |
+ |
syntax("unexpected character"); |
173 |
+ |
} |
174 |
+ |
if (ef) |
175 |
+ |
goto toofew; |
176 |
+ |
if (i <= ff) /* find transform args */ |
177 |
+ |
i = ff+1; |
178 |
+ |
while (i < na && arg[i][0] != '-') |
179 |
+ |
i++; |
180 |
+ |
if (i == na) { /* no transform */ |
181 |
+ |
f->fxp = f->bxp = &unitxf; |
182 |
+ |
} else { /* get transform */ |
183 |
+ |
if ((f->bxp = (XF *)malloc(sizeof(XF))) == NULL) |
184 |
+ |
goto memerr; |
185 |
+ |
if (invxf(f->bxp, na-i, arg+i) != na-i) |
186 |
+ |
objerror(m, USER, "bad transform"); |
187 |
+ |
if (f->bxp->sca < 0.0) |
188 |
+ |
f->bxp->sca = -f->bxp->sca; |
189 |
+ |
if (dofwd) { /* do both transforms */ |
190 |
+ |
if ((f->fxp = (XF *)malloc(sizeof(XF))) == NULL) |
191 |
+ |
goto memerr; |
192 |
+ |
xf(f->fxp, na-i, arg+i); |
193 |
+ |
if (f->fxp->sca < 0.0) |
194 |
+ |
f->fxp->sca = -f->fxp->sca; |
195 |
+ |
} |
196 |
+ |
} |
197 |
+ |
m->os = (char *)f; |
198 |
+ |
return(f); |
199 |
+ |
toofew: |
200 |
+ |
objerror(m, USER, "too few string arguments"); |
201 |
+ |
memerr: |
202 |
+ |
error(SYSTEM, "out of memory in getfunc"); |
203 |
+ |
return NULL; /* pro forma return */ |
204 |
+ |
} |
205 |
+ |
|
206 |
+ |
|
207 |
+ |
void |
208 |
+ |
freefunc( /* free memory associated with modifier */ |
209 |
+ |
OBJREC *m |
210 |
+ |
) |
211 |
+ |
{ |
212 |
+ |
MFUNC *f; |
213 |
+ |
int i; |
214 |
+ |
|
215 |
+ |
if ((f = (MFUNC *)m->os) == NULL) |
216 |
+ |
return; |
217 |
+ |
for (i = 0; f->ep[i] != NULL; i++) |
218 |
+ |
epfree(f->ep[i]); |
219 |
+ |
if (f->ctx[0]) { /* done with definitions */ |
220 |
+ |
setcontext(f->ctx); |
221 |
+ |
i = varvalue(REFVNAME)-.5; /* reference_count-- */ |
222 |
+ |
if (i > 0) |
223 |
+ |
varset(REFVNAME, '=', (double)i); |
224 |
+ |
else |
225 |
+ |
dcleanup(2); /* remove definitions */ |
226 |
+ |
freestr(f->ctx); |
227 |
+ |
} |
228 |
+ |
if (f->bxp != &unitxf) |
229 |
+ |
free((void *)f->bxp); |
230 |
+ |
if ((f->fxp != NULL) & (f->fxp != &unitxf)) |
231 |
+ |
free((void *)f->fxp); |
232 |
+ |
free((void *)f); |
233 |
+ |
m->os = NULL; |
234 |
+ |
} |
235 |
+ |
|
236 |
+ |
|
237 |
+ |
int |
238 |
+ |
setfunc( /* set channels for function call */ |
239 |
+ |
OBJREC *m, |
240 |
+ |
RAY *r |
241 |
+ |
) |
242 |
+ |
{ |
243 |
+ |
static RNUMBER lastrno = ~0; |
244 |
+ |
MFUNC *f; |
245 |
+ |
/* get function if any */ |
246 |
+ |
if ((f = (MFUNC *)m->os) == NULL) |
247 |
+ |
objerror(m, CONSISTENCY, "setfunc called before getfunc"); |
248 |
+ |
|
249 |
+ |
setcontext(f->ctx); /* set evaluator context */ |
250 |
+ |
/* check to see if matrix set */ |
251 |
+ |
if ((m == fobj) & (r->rno == lastrno)) |
252 |
+ |
return(0); |
253 |
|
fobj = m; |
254 |
|
fray = r; |
255 |
< |
if (r->rox != NULL) |
256 |
< |
if (bx != &unitxf) { |
257 |
< |
funcxf.sca = r->rox->b.sca * bx->sca; |
258 |
< |
multmat4(funcxf.xfm, r->rox->b.xfm, bx->xfm); |
255 |
> |
if (r->rox != NULL) { |
256 |
> |
if (f->bxp != &unitxf) { |
257 |
> |
funcxf.sca = r->rox->b.sca * f->bxp->sca; |
258 |
> |
multmat4(funcxf.xfm, r->rox->b.xfm, f->bxp->xfm); |
259 |
|
} else |
260 |
< |
copystruct(&funcxf, &r->rox->b); |
261 |
< |
else |
262 |
< |
copystruct(&funcxf, bx); |
260 |
> |
funcxf = r->rox->b; |
261 |
> |
} else |
262 |
> |
funcxf = *f->bxp; |
263 |
|
lastrno = r->rno; |
264 |
|
eclock++; /* notify expression evaluator */ |
265 |
|
return(1); |
266 |
|
} |
267 |
|
|
268 |
|
|
269 |
< |
setfunc(m, r) /* simplified interface to setmap */ |
270 |
< |
register OBJREC *m; |
271 |
< |
RAY *r; |
269 |
> |
int |
270 |
> |
worldfunc( /* special function context sans object */ |
271 |
> |
char *ctx, |
272 |
> |
RAY *r |
273 |
> |
) |
274 |
|
{ |
275 |
< |
register XF *mxf; |
275 |
> |
static RNUMBER lastrno = ~0; |
276 |
|
|
277 |
< |
if ((mxf = (XF *)m->os) == NULL) { |
278 |
< |
register int n; |
279 |
< |
register char **sa; |
280 |
< |
|
281 |
< |
for (n = m->oargs.nsargs, sa = m->oargs.sarg; |
282 |
< |
n > 0 && **sa != '-'; n--, sa++) |
283 |
< |
; |
284 |
< |
if (n == 0) |
285 |
< |
mxf = &unitxf; |
286 |
< |
else { |
287 |
< |
mxf = (XF *)malloc(sizeof(XF)); |
288 |
< |
if (mxf == NULL) |
289 |
< |
goto memerr; |
95 |
< |
if (invxf(mxf, n, sa) != n) |
96 |
< |
objerror(m, USER, "bad transform"); |
97 |
< |
if (mxf->sca < 0.0) |
98 |
< |
mxf->sca = -mxf->sca; |
99 |
< |
} |
100 |
< |
m->os = (char *)mxf; |
101 |
< |
} |
102 |
< |
return(setmap(m, r, mxf)); |
103 |
< |
memerr: |
104 |
< |
error(SYSTEM, "out of memory in setfunc"); |
277 |
> |
if (rayinitcal[0]) /* initialize on first call */ |
278 |
> |
initfunc(); |
279 |
> |
/* set evaluator context */ |
280 |
> |
setcontext(ctx); |
281 |
> |
/* check if ray already set */ |
282 |
> |
if ((fobj == NULL) & (r->rno == lastrno)) |
283 |
> |
return(0); |
284 |
> |
fobj = NULL; |
285 |
> |
fray = r; |
286 |
> |
funcxf = unitxf; |
287 |
> |
lastrno = r->rno; |
288 |
> |
eclock++; /* notify expression evaluator */ |
289 |
> |
return(1); |
290 |
|
} |
291 |
|
|
292 |
|
|
293 |
< |
loadfunc(fname) /* load definition file */ |
294 |
< |
char *fname; |
293 |
> |
void |
294 |
> |
loadfunc( /* load definition file */ |
295 |
> |
char *fname |
296 |
> |
) |
297 |
|
{ |
111 |
– |
extern char *libpath; /* library search path */ |
298 |
|
char *ffname; |
299 |
|
|
300 |
< |
if ((ffname = getpath(fname, libpath, R_OK)) == NULL) { |
300 |
> |
if ((ffname = getpath(fname, getrlibpath(), R_OK)) == NULL) { |
301 |
|
sprintf(errmsg, "cannot find function file \"%s\"", fname); |
302 |
< |
error(USER, errmsg); |
302 |
> |
error(SYSTEM, errmsg); |
303 |
|
} |
304 |
|
fcompile(ffname); |
305 |
|
} |
306 |
|
|
307 |
|
|
308 |
< |
double |
309 |
< |
l_arg() /* return nth real argument */ |
308 |
> |
static double |
309 |
> |
l_arg(char *nm) /* return nth real argument */ |
310 |
|
{ |
311 |
< |
extern double argument(); |
126 |
< |
register int n; |
311 |
> |
int n; |
312 |
|
|
313 |
+ |
if (fobj == NULL) |
314 |
+ |
error(INTERNAL, "arg(n) called without a modifier context"); |
315 |
+ |
|
316 |
|
n = argument(1) + .5; /* round to integer */ |
317 |
|
|
318 |
|
if (n < 1) |
326 |
|
} |
327 |
|
|
328 |
|
|
329 |
< |
double |
330 |
< |
l_erf() /* error function */ |
329 |
> |
static double |
330 |
> |
l_erf(char *nm) /* error function */ |
331 |
|
{ |
144 |
– |
extern double erf(); |
145 |
– |
|
332 |
|
return(erf(argument(1))); |
333 |
|
} |
334 |
|
|
335 |
|
|
336 |
< |
double |
337 |
< |
l_erfc() /* cumulative error function */ |
336 |
> |
static double |
337 |
> |
l_erfc(char *nm) /* cumulative error function */ |
338 |
|
{ |
153 |
– |
extern double erfc(); |
154 |
– |
|
339 |
|
return(erfc(argument(1))); |
340 |
|
} |
341 |
|
|
342 |
|
|
343 |
|
double |
344 |
< |
chanvalue(n) /* return channel n to calcomp */ |
345 |
< |
register int n; |
344 |
> |
chanvalue( /* return channel n to calcomp */ |
345 |
> |
int n |
346 |
> |
) |
347 |
|
{ |
348 |
< |
double sum; |
349 |
< |
register RAY *r; |
348 |
> |
if (fray == NULL) |
349 |
> |
syntax("ray parameter used in constant expression"); |
350 |
|
|
351 |
|
if (--n < 0) |
352 |
|
goto badchan; |
353 |
|
|
354 |
< |
if (n < 3) /* ray direction */ |
354 |
> |
if (n <= 2) /* ray direction */ |
355 |
|
|
356 |
|
return( ( fray->rdir[0]*funcxf.xfm[0][n] + |
357 |
|
fray->rdir[1]*funcxf.xfm[1][n] + |
358 |
|
fray->rdir[2]*funcxf.xfm[2][n] ) |
359 |
|
/ funcxf.sca ); |
360 |
|
|
361 |
< |
if (n < 6) /* surface normal */ |
361 |
> |
if (n <= 5) /* surface normal */ |
362 |
|
|
363 |
|
return( ( fray->ron[0]*funcxf.xfm[0][n-3] + |
364 |
|
fray->ron[1]*funcxf.xfm[1][n-3] + |
365 |
|
fray->ron[2]*funcxf.xfm[2][n-3] ) |
366 |
|
/ funcxf.sca ); |
367 |
|
|
368 |
< |
if (n < 9) /* intersection */ |
368 |
> |
if (n <= 8) { /* intersection point */ |
369 |
> |
if (fray->rot >= FHUGE) |
370 |
> |
return(0.0); /* XXX should be runtime error? */ |
371 |
|
|
372 |
|
return( fray->rop[0]*funcxf.xfm[0][n-6] + |
373 |
|
fray->rop[1]*funcxf.xfm[1][n-6] + |
374 |
|
fray->rop[2]*funcxf.xfm[2][n-6] + |
375 |
|
funcxf.xfm[3][n-6] ); |
376 |
+ |
} |
377 |
|
|
378 |
< |
if (n == 9) { /* distance */ |
378 |
> |
if (n == 9) /* total distance */ |
379 |
> |
return(raydist(fray,PRIMARY) * funcxf.sca); |
380 |
|
|
192 |
– |
sum = fray->rot; |
193 |
– |
for (r = fray->parent; r != NULL; r = r->parent) |
194 |
– |
sum += r->rot; |
195 |
– |
return(sum * funcxf.sca); |
196 |
– |
|
197 |
– |
} |
381 |
|
if (n == 10) /* dot product (range [-1,1]) */ |
382 |
|
return( fray->rod <= -1.0 ? -1.0 : |
383 |
|
fray->rod >= 1.0 ? 1.0 : |
386 |
|
if (n == 11) /* scale */ |
387 |
|
return(funcxf.sca); |
388 |
|
|
389 |
< |
if (n < 15) /* origin */ |
389 |
> |
if (n <= 14) /* origin */ |
390 |
|
return(funcxf.xfm[3][n-12]); |
391 |
|
|
392 |
< |
if (n < 18) /* i unit vector */ |
392 |
> |
if (n <= 17) /* i unit vector */ |
393 |
|
return(funcxf.xfm[0][n-15] / funcxf.sca); |
394 |
|
|
395 |
< |
if (n < 21) /* j unit vector */ |
396 |
< |
return(funcxf.xfm[1][n-15] / funcxf.sca); |
395 |
> |
if (n <= 20) /* j unit vector */ |
396 |
> |
return(funcxf.xfm[1][n-18] / funcxf.sca); |
397 |
|
|
398 |
< |
if (n < 24) /* k unit vector */ |
398 |
> |
if (n <= 23) /* k unit vector */ |
399 |
|
return(funcxf.xfm[2][n-21] / funcxf.sca); |
400 |
+ |
|
401 |
+ |
if (n == 24) /* single ray (shadow) distance */ |
402 |
+ |
return((fray->rot+raydist(fray->parent,SHADOW)) * funcxf.sca); |
403 |
+ |
|
404 |
+ |
if (n <= 26) /* local (u,v) coordinates */ |
405 |
+ |
return(fray->uv[n-25]); |
406 |
|
badchan: |
407 |
|
error(USER, "illegal channel number"); |
408 |
+ |
return(0.0); |
409 |
|
} |