gistfile1.txt

#include <range/v3/all.hpp>

struct model{
    uint16_t indices[3];
};

int main()
{
    uint16_t ptr[256];
    model models[256 / 3];

    const auto& output = ranges::make_range(ptr, ptr + 256) | ranges::view::chunk(3);
    const auto& input = ranges::make_range(models, models + 256 / 3) |
        ranges::view::transform([](const auto& m) { return ranges::make_range(m.indices, m.indices + 3); }) |
        ranges::view::join;
    ranges::copy(input, output);
    return 0;
}