How to achieve hollowed-out penetration effect by three.js or echarts

both echarts and three.js have tried and can only see one side. The
map is in svg format.
I want to see the effect here, and how to achieve it.
clipboard.png

-------------------------------
clipboard.png

Jul.28,2021

did you set transparent: true, side: THREE.DoubleSide when instantiating Material?
I haven't seen THREE.js for a long time. Demo, who has written a transparent cloud before, has just changed
https://gitee.com/liuyaqi/ear.

.

clipboard.png


not very good at these two, but 3D mapping, if you want perspective, you can try to paste both sides, and then set the normal direction of the map.

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-64f5-1b38941-2c11f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b38941-2c11f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?