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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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1be2651-315e1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be2651-315e1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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