// generate bounding box
    glm::vec3 minbox(std::numeric_limits<float>::max());
    glm::vec3 maxbox(std::numeric_limits<float>::min());
    for (const auto& v : vertices)
    {
        if (v.Position.x > maxbox.x)
            maxbox.x = v.Position.x;
        if (v.Position.x < minbox.x)
            minbox.x = v.Position.x;
        if (v.Position.y > maxbox.y)
            maxbox.y = v.Position.y;
        if (v.Position.y < minbox.y)
            minbox.y = v.Position.y;
        if (v.Position.z > maxbox.z)
            maxbox.z = v.Position.z;
        if (v.Position.z < minbox.z)
            minbox.z = v.Position.z;
    }
    glm::vec3 center = (maxbox + minbox) / 2.f;
    min = minbox;
    max = maxbox;
    mid = center;
    // translate bounding box to center
    maxbox -= center;
    minbox -= center;

    switch (func)
    {
    case ProjectorFn::Cube:
        for (auto& v : vertices)
        {
            glm::vec3 absVec(0);
            if (entity == TexEntity::Normal)
                absVec = glm::abs(v.Normal);
            else
                absVec = glm::abs(v.Position);
            glm::vec2 UV(0);

            // +-X
            if (absVec.x >= absVec.y && absVec.x >= absVec.z)
            {
                (v.Position.x < 0.0) ? (UV.s = v.Position.z) : (UV.s = -v.Position.z);
                UV.t = v.Position.y;
                UV.s /= maxbox.z;
                UV.t /= maxbox.y;
                //UV.s /= absVec.x;
                //UV.t /= absVec.x;
            }
            // +-Y
            else if (absVec.y >= absVec.x && absVec.y >= absVec.z)
            {
                (v.Position.y < 0.0) ? (UV.t = v.Position.z) : (UV.t = -v.Position.z);
                UV.s = v.Position.x;
                UV.s /= maxbox.x;
                UV.t /= maxbox.z;
            }
            // +-Z
            else
            {
                (v.Position.z < 0.0) ? (UV.s = -v.Position.x) : (UV.s = v.Position.x);
                UV.t = v.Position.y;
                UV.s /= maxbox.x;
                UV.t /= maxbox.y;
            }

            UV = (UV + 1.f) / 2.f;
            v.TexCoords = UV;
        }
        break;
    case ProjectorFn::Sphere:
        for (auto& v : vertices)
        {
            glm::vec3 tpos;
            if (entity == TexEntity::Position)
                tpos = v.Position - center;
            else if (entity == TexEntity::Normal)
                tpos = v.Normal;
            float theta = glm::atan(tpos.y / tpos.x);
            float Z = (tpos.z - minbox.z) / (maxbox.z - minbox.z);
            float r = glm::length(tpos);
            float phi = glm::acos(tpos.z / r);
            float U = theta / glm::two_pi<float>(); // convert to 0-1 range
            float V = (glm::pi<float>() - phi) / (glm::pi<float>());
            v.TexCoords = { U, V };
        }
        break;
    case ProjectorFn::Cylinder:
        for (auto& v : vertices)
        {
            glm::vec3 tpos;
            if (entity == TexEntity::Position)
                tpos = v.Position - center;
            else if (entity == TexEntity::Normal)
                tpos = v.Normal;
            float theta = glm::atan(tpos.y / tpos.x);
            float Z = (tpos.z - minbox.z) / (maxbox.z - minbox.z);
            float U = theta / glm::two_pi<float>(); // convert to 0-1 range
            float V = Z;
            v.TexCoords = { U, V };
        }
        break;
    default:
        break;
    }