Question about mesh disappears when camera move close to mesh

Questions
1

I create a rounded banker thanks to prisoner849(Profile - prisoner849 - three.js forum) 's help.
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but some of the meshes disappeared everytime when i move my camera inside

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1626059586(1)1364×657 12.3 KB

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1626059618(1)1356×652 13.6 KB

my camera is

    this.camera = new THREE.PerspectiveCamera(90, dom.clientWidth / dom.clientHeight, 0.01, 20000)
2

any tips would be great

3

To check if this is a culling issue, you can traverse through the object and set the frustumCulled property to false. Do you see any difference?

4

Yes! This works marvelous!Thanks man!
Does this means that the mesh does not actually inside camera’s view even it should be in our reality view?