THREE.BufferGeometryUtils.mergeBufferGeometries

I tried to merge a lot of cylinders, but the result was not expected. I didn’t know where the problem came out. Maybe it was a bug, but when I lowered the number of creation to 600 times code, who could help me, thank you very much!

var geos = [];
for (var i = 0; i < 1000; i++) {
    var geo = new THREE.CylinderBufferGeometry(1, 1, 20, 16);
    var pos = new THREE.Vector3();
    pos.x = Math.random() * 800 - 400;
    pos.z = Math.random() * 800 - 400;
    geo.translate(pos.x, pos.y, pos.z);
    geos.push(geo);
}
var bf_geo = THREE.BufferGeometryUtils.mergeBufferGeometries(geos);
var mergeMesh = new THREE.Mesh(bf_geo, new THREE.MeshLambertMaterial({ color: 0xff0000 }));
scene.add(mergeMesh);

[takahirox]

And I think you can remove if ( indexOffset > 0 ) {

if ( isIndexed ) {

    var indexOffset = 0;
    var mergedIndex = [];

    for ( var i = 0; i < geometries.length; ++ i ) {

        var index = geometries[ i ].index;

        for ( var j = 0; j < index.count; ++ j ) {

            mergedIndex.push( index.getX( j ) + indexOffset );

        }

        indexOffset += geometries[ i ].attributes.position.count;

    }

    mergedGeometry.setIndex( mergedIndex );

}

[takahirox]

I think you can remove

	if ( ! mergedIndex ) return null;