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root/radiance/ray/src/common/fvect.c
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Comparing ray/src/common/fvect.c (file contents):
Revision 2.11 by greg, Thu May 7 21:38:35 2009 UTC vs.
Revision 2.14 by greg, Tue Apr 19 21:31:22 2011 UTC

# Line 13 | Line 13 | static const char      RCSid[] = "$Id$";
13  
14   double
15   fdot(                           /* return the dot product of two vectors */
16 < FVECT v1,
17 < FVECT v2
16 > const FVECT v1,
17 > const FVECT v2
18   )
19   {
20          return(DOT(v1,v2));
# Line 23 | Line 23 | FVECT v2
23  
24   double
25   dist2(                          /* return square of distance between points */
26 < FVECT p1,
27 < FVECT p2
26 > const FVECT p1,
27 > const FVECT p2
28   )
29   {
30          FVECT  delta;
# Line 39 | Line 39 | FVECT p2
39  
40   double
41   dist2line(                      /* return square of distance to line */
42 < FVECT p,                /* the point */
43 < FVECT ep1,
44 < FVECT ep2               /* points on the line */
42 > const FVECT p,          /* the point */
43 > const FVECT ep1,
44 > const FVECT ep2         /* points on the line */
45   )
46   {
47          double  d, d1, d2;
# Line 56 | Line 56 | FVECT ep2              /* points on the line */
56  
57   double
58   dist2lseg(                      /* return square of distance to line segment */
59 < FVECT p,                /* the point */
60 < FVECT ep1,
61 < FVECT ep2               /* the end points */
59 > const FVECT p,          /* the point */
60 > const FVECT ep1,
61 > const FVECT ep2         /* the end points */
62   )
63   {
64          double  d, d1, d2;
# Line 83 | Line 83 | FVECT ep2              /* the end points */
83   void
84   fcross(                         /* vres = v1 X v2 */
85   FVECT vres,
86 < FVECT v1,
87 < FVECT v2
86 > const FVECT v1,
87 > const FVECT v2
88   )
89   {
90          vres[0] = v1[1]*v2[2] - v1[2]*v2[1];
# Line 96 | Line 96 | FVECT v2
96   void
97   fvsum(                          /* vres = v0 + f*v1 */
98   FVECT vres,
99 < FVECT v0,
100 < FVECT v1,
99 > const FVECT v0,
100 > const FVECT v1,
101   double f
102   )
103   {
# Line 119 | Line 119 | FVECT  v
119          if (d == 0.0)
120                  return(0.0);
121          
122 <        if (d <= 1.0+FTINY && d >= 1.0-FTINY)
122 >        if (d <= 1.0+FTINY && d >= 1.0-FTINY) {
123                  len = 0.5 + 0.5*d;      /* first order approximation */
124 <        else
124 >                d = 2.0 - len;
125 >        } else {
126                  len = sqrt(d);
127 <
128 <        v[0] *= d = 1.0/len;
127 >                d = 1.0/len;
128 >        }
129 >        v[0] *= d;
130          v[1] *= d;
131          v[2] *= d;
132  
# Line 135 | Line 137 | FVECT  v
137   int
138   closestapproach(                        /* closest approach of two rays */
139   RREAL t[2],             /* returned distances along each ray */
140 < FVECT rorg0,            /* first origin */
141 < FVECT rdir0,            /* first direction (normalized) */
142 < FVECT rorg1,            /* second origin */
143 < FVECT rdir1             /* second direction (normalized) */
140 > const FVECT rorg0,              /* first origin */
141 > const FVECT rdir0,              /* first direction (normalized) */
142 > const FVECT rorg1,              /* second origin */
143 > const FVECT rdir1               /* second direction (normalized) */
144   )
145   {
146          double  dotprod = DOT(rdir0, rdir1);
# Line 161 | Line 163 | FVECT rdir1            /* second direction (normalized) */
163   void
164   spinvector(                             /* rotate vector around normal */
165   FVECT vres,             /* returned vector */
166 < FVECT vorig,            /* original vector */
167 < FVECT vnorm,            /* normalized vector for rotation */
168 < double theta            /* left-hand radians */
166 > const FVECT vorig,              /* original vector */
167 > const FVECT vnorm,              /* normalized vector for rotation */
168 > double theta            /* right-hand radians */
169   )
170   {
171          double  sint, cost, normprod;

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