ViewVC Help
View File | Revision Log | Show Annotations | Download File | Root Listing
root/radiance/ray/src/common/fvect.c
(Generate patch)

Comparing ray/src/common/fvect.c (file contents):
Revision 1.5 by greg, Tue Mar 19 13:14:19 1991 UTC vs.
Revision 2.2 by greg, Fri Oct 2 16:02:43 1992 UTC

# Line 10 | Line 10 | static char SCCSid[] = "$SunId$ LBL";
10   *     8/14/85
11   */
12  
13 + #include  <math.h>
14   #include  "fvect.h"
15  
15 – #define  FTINY          1e-7
16  
17 –
17   double
18   fdot(v1, v2)                    /* return the dot product of two vectors */
19   register FVECT  v1, v2;
# Line 122 | Line 121 | spinvector(vres, vorig, vnorm, theta)  /* rotate vector
121   FVECT  vres, vorig, vnorm;
122   double  theta;
123   {
124 <        extern double  sin(), cos();
126 <        double  sint, cost, dotp;
124 >        double  sint, cost, normprod;
125          FVECT  vperp;
126          register int  i;
127          
128          if (theta == 0.0) {
129 <                VCOPY(vres, vorig);
129 >                if (vres != vorig)
130 >                        VCOPY(vres, vorig);
131                  return;
132          }
134 –        sint = sin(theta);
133          cost = cos(theta);
134 <        dotp = DOT(vorig, vnorm);
134 >        sint = sin(theta);
135 >        normprod = DOT(vorig, vnorm)*(1.-cost);
136          fcross(vperp, vnorm, vorig);
137          for (i = 0; i < 3; i++)
138 <                vres[i] = vnorm[i]*dotp*(1.-cost) +
140 <                                vorig[i]*cost + vperp[i]*sint;
138 >                vres[i] = vorig[i]*cost + vnorm[i]*normprod + vperp[i]*sint;
139   }

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines