[ViewVC] Diff of: Development/ray/src/common/fvect.c

Comparing ray/src/common/fvect.c (file contents):
Revision 1.4 by greg, Tue Oct 17 13:35:30 1989 UTC vs.
Revision 1.5 by greg, Tue Mar 19 13:14:19 1991 UTC

+        v[2] /= len;
+        return(len);
-+
-+
-+
+spinvector(vres, vorig, vnorm, theta)   /* rotate vector around normal */
-+
+FVECT  vres, vorig, vnorm;
-+
+double  theta;
-+
+{
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+        extern double  sin(), cos();
-+
+        double  sint, cost, dotp;
-+
+        FVECT  vperp;
-+
+        register int  i;
-+
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+        if (theta == 0.0) {
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+                VCOPY(vres, vorig);
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+                return;
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+        }
-+
+        sint = sin(theta);
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+        cost = cos(theta);
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+        dotp = DOT(vorig, vnorm);
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+        fcross(vperp, vnorm, vorig);
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+        for (i = 0; i < 3; i++)
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+                vres[i] = vnorm[i]*dotp*(1.-cost) +
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+                                vorig[i]*cost + vperp[i]*sint;
-+
+}

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