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Comparing ray/src/rt/rv3.c (file contents):
Revision 1.17 by greg, Sun Oct 14 11:06:27 1990 UTC vs.
Revision 1.18 by greg, Tue Mar 19 13:14:03 1991 UTC

# Line 433 | Line 433 | double  zf;
433                  return;
434          }
435   }
436 –
437 –
438 – spinvector(vres, vorig, vnorm, theta)   /* rotate vector around normal */
439 – FVECT  vres, vorig, vnorm;
440 – double  theta;
441 – {
442 –        extern double  sin(), cos();
443 –        double  sint, cost, dotp;
444 –        FVECT  vperp;
445 –        register int  i;
446 –        
447 –        if (theta == 0.0) {
448 –                VCOPY(vres, vorig);
449 –                return;
450 –        }
451 –        sint = sin(theta);
452 –        cost = cos(theta);
453 –        dotp = DOT(vorig, vnorm);
454 –        fcross(vperp, vnorm, vorig);
455 –        for (i = 0; i < 3; i++)
456 –                vres[i] = vnorm[i]*dotp*(1.-cost) +
457 –                                vorig[i]*cost + vperp[i]*sint;
458 – }

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