Why is the three.js cylinder only textured?

three.js frame of WEBGL
I created a cylinder with the geometric model of CylinderGeometry, but I only want to paste it on the side of the arc. I don"t want to paste the bottom of the arc. How to deal with this? Or is there any way to achieve it?

Three.js webgl html5
Mar.10,2021
When

new, the parameter openEnded is passed to true

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