triarea3d()

static double triarea3d ( const double *  P1, const double *  P2, const double *  P3  )

static

Calculate the area of a triangle in 3d space.

Definition at line 81 of file effectivearea.c.

References area(), and LWDEBUG.

Referenced by ptarray_calc_areas(), and tune_areas().

{
        LWDEBUG(2, "Entered  triarea3d");
        double ax,bx,ay,by,az,bz,cx,cy,cz, area;

        ax=P1[0]-P2[0];
        bx=P3[0]-P2[0];
        ay=P1[1]-P2[1];
        by=P3[1]-P2[1];
        az=P1[2]-P2[2];
        bz=P3[2]-P2[2];

        cx = ay*bz - az*by;
        cy = az*bx - ax*bz;
        cz = ax*by - ay*bx;

        area = fabs(0.5*(sqrt(cx*cx+cy*cy+cz*cz)));
        return area;
}

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