Here you can find several kinds of cobweb meshes and materials for any case.

This package is a part of Undeground bundle (save 50%)

Support, URP and HDRP shaders are here:

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Triangle counts:

Cobweb strips - 32 tris

Cocoons - 404 tris

All usual meshes - 1742 tris

All simple meshes - 84 tris