local function circle1()
	local t = {}
	for i = 0, 1000 do
		local x = math.sin(i)
		local y = math.cos(i)
		t[#t+1] = {x = x, y = -3.0, z = y}
	end
	return t
end

-- 返回顶点数组格式是：{{x = 1.0, y = 1.0, z = 1.0}, {x = 2.0, y = 2.0, z = 2.0}, ...} 。
function getpoints()
	return circle1()
end