一个OFRE引擎中要用到的工具，用来观察mesh模型的渲染效果。-OFRE engine to use a tool, used to observe the mesh model rendering.

模拟了带小孔容器中气体分子的热运动情况，给出动态图像(The thermal motion of gas molecules in a vessel with a small hole is simulated, and a dynamic image is given)