```struct PT3
{
double x, y, z;
};
int solveCenterPointOfCircle(std::vector<PT3> pt, double centerpoint[])
{
double a1, b1, c1, d1;
double a2, b2, c2, d2;
double a3, b3, c3, d3;
double x1 = pt[].x, y1 = pt[].y, z1 = pt[].z;
double x2 = pt[].x, y2 = pt[].y, z2 = pt[].z;
double x3 = pt[].x, y3 = pt[].y, z3 = pt[].z;
a1 = (y1*z2 - y2*z1 - y1*z3 + y3*z1 + y2*z3 - y3*z2);
b1 = -(x1*z2 - x2*z1 - x1*z3 + x3*z1 + x2*z3 - x3*z2);
c1 = (x1*y2 - x2*y1 - x1*y3 + x3*y1 + x2*y3 - x3*y2);
d1 = -(x1*y2*z3 - x1*y3*z2 - x2*y1*z3 + x2*y3*z1 + x3*y1*z2 - x3*y2*z1);
a2 = * (x2 - x1);
b2 = * (y2 - y1);
c2 = * (z2 - z1);
d2 = x1 * x1 + y1 * y1 + z1 * z1 - x2 * x2 - y2 * y2 - z2 * z2;
a3 = * (x3 - x1);
b3 = * (y3 - y1);
c3 = * (z3 - z1);
d3 = x1 * x1 + y1 * y1 + z1 * z1 - x3 * x3 - y3 * y3 - z3 * z3;
centerpoint[] = -(b1*c2*d3 - b1*c3*d2 - b2*c1*d3 + b2*c3*d1 + b3*c1*d2 - b3*c2*d1)
/(a1*b2*c3 - a1*b3*c2 - a2*b1*c3 + a2*b3*c1 + a3*b1*c2 - a3*b2*c1);
centerpoint[] = (a1*c2*d3 - a1*c3*d2 - a2*c1*d3 + a2*c3*d1 + a3*c1*d2 - a3*c2*d1)
/(a1*b2*c3 - a1*b3*c2 - a2*b1*c3 + a2*b3*c1 + a3*b1*c2 - a3*b2*c1);
centerpoint[] = -(a1*b2*d3 - a1*b3*d2 - a2*b1*d3 + a2*b3*d1 + a3*b1*d2 - a3*b2*d1)
/(a1*b2*c3 - a1*b3*c2 - a2*b1*c3 + a2*b3*c1 + a3*b1*c2 - a3*b2*c1);
return ;
}```

Refer to ：

http://blog.csdn.net/yanmy2012/article/details/8111600

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