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var flower = new THREE.Object3D();

for ( var i = 0; i < 24 ; i++ )
{
    var cylinder = new THREE.Mesh( cylGeom, petalMaterial );
    cylinder.position.y = petalLength / 2;

    var petal = new THREE.Object3D();
    petal.add( cylinder );
    petal.rotation.z = 90 * Math.PI/180;
    petal.rotation.y = 15*i * Math.PI/180;
    petal.position.y = flowerHeight;

    flower.add( petal );
}