Updating UV coordinates of BufferGeometry

Questions
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2

Try it like so:

var uvAttribute = geometry.attributes.uv;
		
for ( var i = 0; i < uvAttribute.count; i ++ ) {
		
    var u = uvAttribute.getX( i );
    var v = uvAttribute.getY( i );
			
    // do something with uv

    // write values back to attribute
			
    uvAttribute.setXY( i, u, v );
		
}

For debugging a small live demo: Edit fiddle - JSFiddle - Code Playground