地球

地球

# include <Siv3D.hpp>

void Main()
{
    const Texture texture(L"Example/Earth.jpg", TextureDesc::For3D);

    while (System::Update())
    {
        Graphics3D::FreeCamera();

        const double yaw = System::FrameCount() * -0.001;

        Sphere(10).asMesh()
            .rotated(Quaternion::Yaw(yaw).roll(-23.4_deg))
            .draw(texture);
    }
}

地球と太陽

# include <Siv3D.hpp>

void Main()
{
    Graphics::SetBackground(Color(12));
    Graphics3D::SetLight(0, Light::Directional(Vec3(1, 0, 0)));
    Graphics3D::SetAmbientLight(ColorF(0.05));
    Graphics3D::SetBlendStateForward(BlendState::Additive);
    Graphics3D::SetDepthStateForward(DepthState::TestOnly);

    const Mesh meshSphere(MeshData::Sphere(10.0, 64));
    const Texture texture(L"Example/Earth.jpg", TextureDesc::For3D);
    const Texture textureStar(L"Example/Particle.png", TextureDesc::For3D);

    GUI gui(GUIStyle::Default);
    gui.add(L"solstice", GUIToggleSwitch::Create(L"夏至", L"冬至", false));

    Array<Particle> particles(2000);

    for (size_t i = 0; i < particles.size(); ++i)
    {
        const Vec3 pos = Spherical(10000, Random(Pi), Random(TwoPi));
        particles[i] = Particle(pos, Random(20, 60), RandomColorH(0.2, 1.0));
    }

    particles[particles.size() - 1] = Particle(Vec3(10000, 0, 0), 400.0, ColorF(1.0, 0.8, 0.4));

    while (System::Update())
    {
        Graphics3D::FreeCamera();

        const double yaw = System::FrameCount() * -0.001;

        const double angle = (gui.toggleSwitch(L"solstice").isLeft ? -23.4_deg : 23.4_deg);

        meshSphere
            .rotated(Quaternion::Yaw(yaw).roll(angle))
            .draw(texture);

        Cylinder(Vec3(0, -20, 0), Vec3(0, 20, 0), 0.1).asMesh()
            .rotated(Quaternion::Yaw(yaw).roll(angle))
            .draw();

        Graphics3D::DrawParticlesForward(particles, textureStar);
    }
}