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root/radiance/ray/src/gen/genworm.c
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Comparing ray/src/gen/genworm.c (file contents):
Revision 1.3 by greg, Fri Mar 2 17:24:05 1990 UTC vs.
Revision 1.4 by greg, Wed Mar 7 11:14:39 1990 UTC

# Line 1 | Line 1
1 – /* Copyright (c) 1989 Regents of the University of California */
2 –
1   #ifndef lint
2   static char SCCSid[] = "$SunId$ LBL";
3   #endif
4  
5 + /* Copyright (c) 1989 Regents of the University of California */
6 +
7   /*
8   *  genworm.c - program to generate worms (strings with varying thickness).
9   *
# Line 30 | Line 30 | static char SCCSid[] = "$SunId$ LBL";
30   #define  max(a,b)       ((a) > (b) ? (a) : (b))
31  
32  
33 < double  funvalue(), l_hermite(), l_bezier(), argument();
33 > double  funvalue(), l_hermite(), l_bezier(), l_bspline(), argument();
34  
35  
36   main(argc, argv)
# Line 45 | Line 45 | char  *argv[];
45          varset("PI", PI, NULL);
46          funset("hermite", 5, l_hermite);
47          funset("bezier", 5, l_bezier);
48 +        funset("bspline", 5, l_bspline);
49  
50          if (argc < 8)
51                  goto userror;
# Line 176 | Line 177 | l_bezier()
177                  argument(2) * 3.*t*(1.+t*(-2.+t)) +
178                  argument(3) * 3.*t*t*(1.-t) +
179                  argument(4) * t*t*t );
180 + }
181 +
182 +
183 + double
184 + l_bspline()
185 + {
186 +        double  t;
187 +
188 +        t = argument(5);
189 +        return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) +
190 +                argument(2) * (2./3.+t*t*(-1.+1./2.*t)) +
191 +                argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) +
192 +                argument(4) * (1./6.*t*t*t) );
193   }

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