Custom UV Mapping

Questions
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2

Take a look at these examples from the Collection of examples from discourse.threejs.org .

BufferGeometryIndexed
BufferGeometryNonIndexed

RoundedRectangle
RoundEdgedBoxFlat

CircleDynamicallyFormable

BeginnerExample step 12

A little more complicated:
Curved2Geometry

see

function BasicGeometry( radialSegments, heightSegments, withTop, withBottom ) { ...