XProfan

const g = new THREE.BufferGeometry( );

const parameters =  {

    d: 0.052,// rough side length of the triangles
    div4: 30,// division of the quarter circle
    bottom: -1,
    div4Btm: 30,// division bottom adaptation, (to quarter, >= div4)
    top: 1,
    div4Top: 90,// division top adaptation, (to quarter, >= div4)
    holes: [
    // circular (deformed) hole, 3 elements: [ y, phi, div4Hole ], div4Hole <= div4
    [   0.3,  1.6, 12 ],
    [  -0.4,  3.7, 14 ],
    [  -0.1, -0.9, 18 ],
    // points hole,: array of points y, phi, ...  (last point is connected to first)
    [ 0.15,0.45, 0.5,0.9, 0.75,0.51, 0.8,0.2, 0.1,-0.15  ]
    ]

}

cylinderWithHoles( parameters );

const lenXZ = ( x, z ) => ( Math.sqrt( x * x + z * z ) );
...
// points 1, 2
xv2 = x2 - x1;
yv2 = y2 - y1;
zv2 = z2 - z1;
len = length( xv2, yv2, zv2 );

if ( len > g.d ) {//  > rough side length of the triangles

    count = Math.ceil( len / g.d );

    for ( let k = 1; k < count; k ++ ) {

        x = x1 + k * xv2 / count;
        y = y1 + k * yv2 / count;
        z = z1 + k * zv2 / count;
        len = lenXZ( x, z );// to bring the point to the surface (radius * ..)
        g.positions[ posIdx     ] = g.radius * x / len;
        g.positions[ posIdx + 1 ] = y;
        g.positions[ posIdx + 2 ] = g.radius * z / len;
        ...

const parameters =  {

    d: 0.052,// rough side length of the triangles
    div4: 30,// division of the quarter circle
    bottom: -1,
    div4Btm: 30,// division bottom adaptation, (to quarter, >= div4)
    phiBtm: 1.57,// rotation of adaptive-deformed circle (Bottom)
    top: 1,
    div4Top: 33,// division top adaptation, (to quarter, >= div4)
    phiTop: -0.2,// rotation of adaptive-deformed circle (Top)
    holes: [
    // circular (deformed) hole, 3 elements: [ y, phi, div4Hole ], div4Hole <= div4
    [   0.3,  1.6, 12 ],
    [  -0.4,  3.7, 14 ],
    [  -0.1, -0.9, 18 ],
    //points hole,: array of points y, phi, ...  (last point is connected to first)
    [ 0.15,0.45, 0.5,0.9, 0.8,0.6, 0.75,-0.2, 0.1,-0.15  ]
    ]

}