mpri-graphics-project/tests/TestImplicitSphere.cpp

#include "TestImplicitSphere.hpp"

double TestImplicitSphere::operator()(double x, double y, double z) const {
    auto sq = [](double x) { return x*x; };
    return - (sq(center.x - x)
            + sq(center.y - y)
            + sq(center.z - z))
        + sq(radius);
}

Point TestImplicitSphere::location_hint() const {
    return Point(center.x + radius, center.y, center.z);
}