53 |
|
|
54 |
|
VIEW midview = STDVIEW; |
55 |
|
|
56 |
+ |
int wrongformat = 0; |
57 |
|
|
58 |
+ |
|
59 |
|
main(argc, argv) |
60 |
|
int argc; |
61 |
|
char *argv[]; |
91 |
|
exit(1); |
92 |
|
} |
93 |
|
/* read header */ |
94 |
< |
getheader(stdin, headline); |
94 |
> |
getheader(stdin, headline, NULL); |
95 |
> |
if (wrongformat) { |
96 |
> |
fprintf(stderr, "%s: bad input format\n", progname); |
97 |
> |
exit(1); |
98 |
> |
} |
99 |
|
if (print_header) { /* add to header */ |
100 |
|
printargs(i, argv, stdout); |
101 |
|
putchar('\n'); |
102 |
|
} |
103 |
|
/* set view */ |
104 |
|
if (setview(&midview) != NULL) { |
105 |
< |
fprintf(stderr, "%s: bad view information in input\n"); |
105 |
> |
fprintf(stderr, "%s: bad view information in input\n", |
106 |
> |
progname); |
107 |
|
exit(1); |
108 |
|
} |
109 |
|
/* get findglare data */ |
126 |
|
headline(s) /* get line from header */ |
127 |
|
char *s; |
128 |
|
{ |
129 |
+ |
char fmt[32]; |
130 |
+ |
|
131 |
|
if (print_header) /* copy to output */ |
132 |
|
fputs(s, stdout); |
133 |
|
if (!strncmp(s, VIEWSTR, VIEWSTRL)) |
134 |
|
sscanview(&midview, s+VIEWSTRL); |
135 |
+ |
else if (isformat(s)) { |
136 |
+ |
formatval(fmt, s); |
137 |
+ |
wrongformat = strcmp(fmt, "ascii"); |
138 |
+ |
} |
139 |
|
} |
140 |
|
|
141 |
|
|
239 |
|
* All vectors are assumed to be normalized. |
240 |
|
* This function is an implementation of the method proposed by |
241 |
|
* Robert Levin in his 1975 JIES article. |
242 |
+ |
* This calculation presumes the view direction and up vectors perpendicular. |
243 |
|
* We return a value less than zero for improper positions. |
244 |
|
*/ |
245 |
|
|
253 |
|
d = DOT(sd,vd); |
254 |
|
if (d <= 0.0) |
255 |
|
return(-1.0); |
256 |
+ |
if (d >= 1.0) |
257 |
+ |
return(1.0); |
258 |
|
sigma = acos(d) * (180./PI); |
259 |
< |
tau = acos(DOT(sd,vu)/sqrt(1.0-d*d)) * (180./PI); |
259 |
> |
d = DOT(sd,vu)/sqrt(1.0-d*d); |
260 |
> |
if (d >= 1.0) |
261 |
> |
tau = 0.0; |
262 |
> |
else |
263 |
> |
tau = acos(d) * (180./PI); |
264 |
|
return( exp( sigma*( (35.2 - tau*.31889 - 1.22*exp(-.22222*tau))*1e-3 |
265 |
|
+ sigma*(21. + tau*(.26667 + tau*-.002963))*1e-5 ) |
266 |
|
) ); |