SphereUnion.h

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#ifndef __VCGTEST_SPHEREUNION
#define __VCGTEST_SPHEREUNION

class SphereUnion
{
public:
        SphereUnion()
        {};

        SphereUnion(const ImplicitSphere &sphere1, const ImplicitSphere &sphere2)
        {
                _sphere1 = sphere1; 
                _sphere2 = sphere2;
        };

        SphereUnion(const SphereUnion &sphere_union)
        {
                _sphere1 = sphere_union._sphere1;
                _sphere2 = sphere_union._sphere2;
        }

        SphereUnion& operator=(const SphereUnion &sphere_union)
        {
                if (this != &sphere_union)
                {
                        _sphere1 = sphere_union._sphere1;
                        _sphere2 = sphere_union._sphere2;
                }
                return *this;
        }

        bool operator!=(const SphereUnion &sphere_union)
        {
                bool comp1 = _sphere1 != sphere_union._sphere1;
                bool comp2 = _sphere2 != sphere_union._sphere2;
                return (comp1 && comp2);
        }

        float V(int x, int y, int z)
        {
                return vcg::math::Min<float>(_sphere1.V(x, y, z), _sphere2.V(x, y, z));
        };

        bool DirectedDistance(const vcg::Point3i &p1, const vcg::Point3i &p2, vcg::Point3f &v, vcg::Point3f &n, float &d)
        {
                vcg::Point3f v1, n1;
                vcg::Point3f v2, n2;
                float                            d1, d2;

                bool ok1 = _sphere1.DirectedDistance(p1, p2, v1, n1, d1);
                bool ok2 = _sphere2.DirectedDistance(p1, p2, v2, n2, d2);

                if (ok1 && ok2)
                { 
                        if (d1 < d2) 
                                ok2 = false; 
                        else 
                                ok1 = false; 
                }
                
                if (ok1)
                {
                        v = v1;
                        n = n1;
                        d = d1;
                        return true;
                }
                else if (ok2)
                {
                        v = v2;
                        n = n2;
                        d = d2;
                        return true;
                }
                else
                        return false;
        };

private:
        ImplicitSphere _sphere1;
        ImplicitSphere _sphere2;
};

#endif // __VCGTEST_SPHEREUNION