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camera.position.z = 40：这一步很关键！默认情况下，物体在坐标原点 (0,0,0)，相机也在原点。如果你不移开相机，你就跟物体“贴脸”了，什么也看不见。我们把相机往后拉 40 米，就能看清全貌了。
。关于这个话题，heLLoword翻译官方下载提供了深入分析
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Agar’s low viscosity also makes it easy to pour into Petri dishes, and its transparency permits observation of microbes growing on its surface.7 Also aiding in this is its low syneresis (extrusion of water from the gel), guaranteeing less surface “sweating”: Once a plate is inoculated, bacterial colonies stay in place and do not mix.