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root/Development/ray/src/common/fvect.c
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Comparing ray/src/common/fvect.c (file contents):
Revision 1.5 by greg, Tue Mar 19 13:14:19 1991 UTC vs.
Revision 1.6 by greg, Tue Apr 2 15:27:44 1991 UTC

# Line 122 | Line 122 | spinvector(vres, vorig, vnorm, theta)  /* rotate vector
122   FVECT  vres, vorig, vnorm;
123   double  theta;
124   {
125 <        extern double  sin(), cos();
126 <        double  sint, cost, dotp;
125 >        extern double  cos(), sin();
126 >        double  sint, cost, normprod;
127          FVECT  vperp;
128          register int  i;
129          
130          if (theta == 0.0) {
131 <                VCOPY(vres, vorig);
131 >                if (vres != vorig)
132 >                        VCOPY(vres, vorig);
133                  return;
134          }
134 –        sint = sin(theta);
135          cost = cos(theta);
136 <        dotp = DOT(vorig, vnorm);
136 >        sint = sin(theta);
137 >        normprod = DOT(vorig, vnorm)*(1.-cost);
138          fcross(vperp, vnorm, vorig);
139          for (i = 0; i < 3; i++)
140 <                vres[i] = vnorm[i]*dotp*(1.-cost) +
140 <                                vorig[i]*cost + vperp[i]*sint;
140 >                vres[i] = vorig[i]*cost + vnorm[i]*normprod + vperp[i]*sint;
141   }

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