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root/Development/ray/src/common/dircode.c
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Comparing ray/src/common/dircode.c (file contents):
Revision 2.1 by greg, Tue Mar 4 05:49:21 2003 UTC vs.
Revision 2.4 by schorsch, Sat Jun 7 12:50:20 2003 UTC

# Line 1 | Line 1
1   #ifndef lint
2 < static const char       RCSid[] = "$Id$";
2 > static const char RCSid[] = "$Id$";
3   #endif
4   /*
5 < * Compute 4-byte direction code (assume this fits into int)
5 > * Compute a 4-byte direction code (int4 type defined in standard.h).
6 > *
7 > * Mean accuracy is 0.0022 degrees, with a maximum error of 0.0058 degrees.
8   */
9  
10   #include "standard.h"
# Line 27 | Line 29 | FVECT  dv;
29  
30          for (i = 0; i < 3; i++)
31                  if (dv[i] < 0.) {
32 <                        cd[i] = dv[i] * -DCSCALE;
32 >                        cd[i] = (int)(dv[i] * -DCSCALE);
33                          dc |= FXNEG<<i;
34                  } else
35 <                        cd[i] = dv[i] * DCSCALE;
35 >                        cd[i] = (int)(dv[i] * DCSCALE);
36          if (cd[0] <= cd[1]) {
37                  dc |= F1X | cd[0] << F1SFT;
38                  cm = cd[1];
# Line 42 | Line 44 | FVECT  dv;
44                  dc |= F2Z | cd[2] << F2SFT;
45          else
46                  dc |= cm << F2SFT;
47 +        if (!dc)        /* don't generate 0 code */
48 +                dc = F1X;
49          return(dc);
50   }
51  

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