54 |
|
/* check to see if done already */ |
55 |
|
if ((f = (MFUNC *)m->os) != NULL) |
56 |
|
return(f); |
57 |
+ |
fobj = NULL; fray = NULL; |
58 |
|
if (initfile[0]) { /* initialize on first call */ |
59 |
|
setcontext(""); |
60 |
|
scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0); |
61 |
|
scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0); |
62 |
|
scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0); |
63 |
< |
scompile("T=$10;Rdot=$11;", NULL, 0); |
63 |
> |
scompile("T=$10;Ts=$25;Rdot=$11;", NULL, 0); |
64 |
|
scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0); |
65 |
|
scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0); |
66 |
|
scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0); |
212 |
|
extern double argument(); |
213 |
|
register int n; |
214 |
|
|
215 |
+ |
if (fobj == NULL) |
216 |
+ |
syntax("arg(n) used in constant expression"); |
217 |
+ |
|
218 |
|
n = argument(1) + .5; /* round to integer */ |
219 |
|
|
220 |
|
if (n < 1) |
253 |
|
double sum; |
254 |
|
register RAY *r; |
255 |
|
|
256 |
+ |
if (fray == NULL) |
257 |
+ |
syntax("ray parameter used in constant expression"); |
258 |
+ |
|
259 |
|
if (--n < 0) |
260 |
|
goto badchan; |
261 |
|
|
280 |
|
fray->rop[2]*funcxf.xfm[2][n-6] + |
281 |
|
funcxf.xfm[3][n-6] ); |
282 |
|
|
283 |
< |
if (n == 9) { /* distance */ |
277 |
< |
|
283 |
> |
if (n == 9) { /* total distance */ |
284 |
|
sum = fray->rot; |
285 |
|
for (r = fray->parent; r != NULL; r = r->parent) |
286 |
|
sum += r->rot; |
287 |
|
return(sum * funcxf.sca); |
288 |
|
|
289 |
|
} |
290 |
+ |
|
291 |
|
if (n == 10) /* dot product (range [-1,1]) */ |
292 |
|
return( fray->rod <= -1.0 ? -1.0 : |
293 |
|
fray->rod >= 1.0 ? 1.0 : |
307 |
|
|
308 |
|
if (n < 24) /* k unit vector */ |
309 |
|
return(funcxf.xfm[2][n-21] / funcxf.sca); |
310 |
+ |
|
311 |
+ |
if (n == 24) { /* single ray (shadow) distance */ |
312 |
+ |
sum = fray->rot; |
313 |
+ |
for (r = fray->parent; r != NULL && r->crtype&SHADOW; |
314 |
+ |
r = r->parent) |
315 |
+ |
sum += r->rot; |
316 |
+ |
return(sum * funcxf.sca); |
317 |
+ |
} |
318 |
|
badchan: |
319 |
|
error(USER, "illegal channel number"); |
320 |
|
} |