src/vector.h


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#ifndef VECTOR_H
#define VECTOR_H

#include <math.h>

#define DOT(a,b) ((a)[0]*(b)[0] + (a)[1]*(b)[1] + (a)[2]*(b)[2])

#define NORM(a) (sqrt(DOT((a),(a))))

#define COPY(a,b)                                  \
do {                                               \
    (a)[0] = (b)[0];                               \
    (a)[1] = (b)[1];                               \
    (a)[2] = (b)[2];                               \
} while (0)

#define MUL(a,b)                                   \
do {                                               \
    (a)[0] *= (b);                                 \
    (a)[1] *= (b);                                 \
    (a)[2] *= (b);                                 \
} while (0)

#define DIV(a,b)                                   \
do {                                               \
    (a)[0] /= (b);                                 \
    (a)[1] /= (b);                                 \
    (a)[2] /= (b);                                 \
} while (0)

#define ADD(c,a,b)                                 \
do {                                               \
    (c)[0] = (a)[0] + (b)[0];                      \
    (c)[1] = (a)[1] + (b)[1];                      \
    (c)[2] = (a)[2] + (b)[2];                      \
} while (0)

#define SUB(c,a,b)                                 \
do {                                               \
    (c)[0] = (a)[0] - (b)[0];                      \
    (c)[1] = (a)[1] - (b)[1];                      \
    (c)[2] = (a)[2] - (b)[2];                      \
} while (0)

#define CROSS(c,a,b)                               \
do {                                               \
    (c)[0] = (a)[1]*(b)[2] - (a)[2]*(b)[1];        \
    (c)[1] = (a)[2]*(b)[0] - (a)[0]*(b)[2];        \
    (c)[2] = (a)[0]*(b)[1] - (a)[1]*(b)[0];        \
} while (0)

void normalize(double *a);
void rotate(double *dest, double *v, double *n, double phi);

#endif