坐标转换

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/*
DECART
AcGePoint3d::x - X
AcGePoint3d::y - Y
AcGePoint3d::z - Z

SPHERICAL
AcGePoint3d::x - r
AcGePoint3d::y - phi
AcGePoint3d::z - theta
*/
AcGePoint3d Decart2Spherical(AcGePoint3d c)
{
        AcGePoint3d p;
        p.x=sqrt(c.x*c.x+c.y*c.y+c.z*c.z);
        p.y=acos(c.x/sqrt(c.x*c.x+c.y*c.y))*(c.y>=0?1:-1);
        p.z=acos(c.z/p.x);
        return p;
}

AcGePoint3d Spherical2Decart(AcGePoint3d p)
{
        decart d;
        d.x=p.x*cos(p.y)*sin(p.z);
        d.y=p.x*sin(p.y)*sin(p.z);
        d.z=p.x*cos(p.z);
        return d;
}