Add a picking example

[WindowsNT]

It would help to have a picking method.

I'm trying to make my own, it doesn't work fully, what if the object is translated.

std::shared_ptr<item> Pick(float mouseX,float mouseY)
{
     
    // Right Hand conversion
    float pointX = (((2.0f * (float)mouseX) / (float)wi) - 1.0f) * -1.0f;
    float pointY = (((2.0f * (float)mouseY) / (float)he) - 1.0f);

    Vector3 origin = Vector3(pointX, pointY, 0);
    Vector3 farx = Vector3(pointX, pointY, 1);

    for (auto& m : models)
    {
        DirectXTK::BoundingSphere b = m->get_bounding_sphere();  // uses DirectXTK
        SimpleMath::Matrix worldMatrix = m->world;  // how to use this?

        auto m1 = m_view * m_proj;
        Matrix m2;
        m1.Invert(m2);

        // Now transform the ray origin and the ray direction from view space to world space.
        auto rayOrigin = XMVector3TransformCoord(origin, m2);
        auto rayend = XMVector3TransformCoord(farx, m2);

        // Normalize the ray direction.
        auto rayDirection = XMVector3Normalize(rayend - rayOrigin);

        float radius = 0;
        bool intersect = b.Intersects(rayOrigin, rayDirection, radius);

        if (intersect == true)
            return m;

        }
    return nullptr;
}