crates = {}

levels = 5
crate = ag.loadModel("crate", 0.5)
crates[1] = crate
offset = 0.5
crate:setPosition(0, 0, offset + levels + 0.5)
cratenum = 1
for level = 2, levels do
    for x = 1, level do
        local c = crate:clone()
        c:setPosition((x - 1) * 1.5 - (level * 1.5 - 0.5)/2 + 0.5,
            0, offset + levels - level + 1.5)
        cratenum = cratenum + 1
        crates[cratenum] = c
    end
end

ground = ag.loadStaticModel("crate", 10)
ground:setPosition(0, 0, -10)
ag.setCamera(2, -12, 8, 0, 0, 2, 0, 0, 1)

function key_pressed_event(key)
    if (key == "d") then
        if (cratenum >= 1) then
            local idx = math.random(cratenum)
            crates[idx]:destroy()
            for i = idx, cratenum - 1 do
                crates[i] = crates[i + 1]
            end
            crates[cratenum] = nil
            cratenum = cratenum - 1
        end
    end
end