# include <Siv3D.hpp> void Main() { Window::Resize({ 300, 300 }); const Vec2 center = Scene::CenterF(); while (System::Update()) { constexpr Duration periodSec = 2s; const double rotateRate = s3d::Periodic::Sawtooth0_1(periodSec * 0.75); const double</siv3d.hpp>…