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root/radiance/ray/src/cv/bsdfmesh.c
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Comparing ray/src/cv/bsdfmesh.c (file contents):
Revision 2.31 by greg, Thu Aug 21 13:44:05 2014 UTC vs.
Revision 2.32 by greg, Thu Aug 21 19:31:23 2014 UTC

# Line 72 | Line 72 | est_DSFrad(const RBFNODE *rbf, const FVECT outvec)
72          double          DSFoutside = eval_DSFsurround(rbf, outvec, outside_rad);
73   #define interp_rad      inside_rad + (outside_rad-inside_rad) * \
74                                  (DSFtarget-DSFinside) / (DSFoutside-DSFinside)
75 <                                                /* interpolation search */
76 <        while (outside_rad-inside_rad > rad_epsilon) {
75 >                                                /* Newton's method (sort of) */
76 >        do {
77                  double  test_rad = interp_rad;
78 <                double  DSFtest = eval_DSFsurround(rbf, outvec, test_rad);
79 <                if (DSFtarget < DSFtest) {
78 >                double  DSFtest;
79 >                if (test_rad >= outside_rad)
80 >                        return(test_rad);
81 >                if (test_rad <= inside_rad)
82 >                        return(test_rad*(test_rad>0));
83 >                DSFtest = eval_DSFsurround(rbf, outvec, test_rad);
84 >                if (DSFtest > DSFtarget) {
85                          inside_rad = test_rad;
86                          DSFinside = DSFtest;
87                  } else {
88                          outside_rad = test_rad;
89                          DSFoutside = DSFtest;
90                  }
91 <        }
91 >                if (DSFoutside >= DSFinside)
92 >                        return(test_rad);
93 >        } while (outside_rad-inside_rad > rad_epsilon);
94          return(interp_rad);
95   #undef interp_rad
96   }

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