--Create a window
        window = Window:Create()
        context = Context:Create(window)
        world = World:Create() 
        local camera = Camera:Create() 
        camera:SetRotation(35,0,0) 
        camera:Move(0,0,-4) 
        local light = DirectionalLight:Create() 
        light:SetRotation(35,35,0) 
        
         --Create a model from scratch
        local model = Model:Create() 
        local surface = model:AddSurface() 
        surface:AddVertex(-0.5,-0.5,0, 0,0,-1) 
        surface:AddVertex(0.5,-0.5,0, 0,0,-1) 
        surface:AddVertex(0.5,0.5,0, 0,0,-1) 
        surface:AddVertex(-0.5,0.5,0, 0,0,-1) 
        surface:AddTriangle(2,1,0) 
        surface:AddTriangle(0,3,2) 
 
         --Update the vertex tangents and binormals so normal mapping appears correctly
        surface:UpdateTangentsAndBinormals() 

        model:UpdateAABB(Entity.LocalAABB)
        model:UpdateAABB(Entity.GlobalAABB) 

         --Load a material and apply it
        local  material = Material:Load("Materials/Concrete/concrete_dirty.mat") 
        model:SetMaterial(material) 
        material:Release() 
        
        while true do        
        if window:Closed() or window:KeyHit(Key.Escape) then return false end

        Time:Update()
        world:Update()
        world:Render()
        context:Sync()

        end