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

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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.

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