local fail = {}

function replaceModel ( iModel, sTXD )
    local pTXD = engineLoadTXD ( "objz/" .. sTXD .. ".txd" )
    if not pTXD then
        -- Loading failed, so reload again to avoid white models.
        if not fail [ iModel ] then
            -- Mostly the texture will re
            fail [ iModel ] = true
            return replaceModel ( iModel, sTXD )
        end
    end

    engineImportTXD ( pTXD, iModel )

    -- replace dff and col here ....
end

replaceModel ( 3375, "hello" )