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root/radiance/ray/src/gen/gensurf.c
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Comparing ray/src/gen/gensurf.c (file contents):
Revision 1.6 by greg, Fri Mar 2 17:24:02 1990 UTC vs.
Revision 1.7 by greg, Wed Mar 7 11:14:36 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   *  gensurf.c - program to generate functional surfaces
9   *
# Line 34 | Line 34 | int  smooth = 0;               /* apply smoothing? */
34  
35   char  *modname, *surfname;
36  
37 < double  funvalue(), l_hermite(), l_bezier(), argument();
37 > double  funvalue(), l_hermite(), l_bezier(), l_bspline(), argument();
38  
39   typedef struct {
40          FVECT  p;       /* vertex position */
# Line 53 | Line 53 | char  *argv[];
53          varset("PI", PI);
54          funset("hermite", 5, l_hermite);
55          funset("bezier", 5, l_bezier);
56 +        funset("bspline", 5, l_bspline);
57  
58          if (argc < 8)
59                  goto userror;
# Line 429 | Line 430 | l_bezier()
430                  argument(2) * 3.*t*(1.+t*(-2.+t)) +
431                  argument(3) * 3.*t*t*(1.-t) +
432                  argument(4) * t*t*t );
433 + }
434 +
435 +
436 + double
437 + l_bspline()
438 + {
439 +        double  t;
440 +
441 +        t = argument(5);
442 +        return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) +
443 +                argument(2) * (2./3.+t*t*(-1.+1./2.*t)) +
444 +                argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) +
445 +                argument(4) * (1./6.*t*t*t) );
446   }

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