THREE.js对象克隆在视锥体之外

Question

在我的程序中，有一个由线条构成的网格，我克隆，更改顶点，添加到数组，然后添加到场景中作为不断增长的conga线形状。问题是克隆的形状似乎遵循与原始形状相同的平截头体，所以如果我看到康加线的开头，我可以看到它，但如果我看到结束（并且开始是不在视野中） ）整个事情都消失了。

我找不到影响截头体的“needsUpdate”参数，而不是frustrumCulled，但我不想禁用截头剔除，因为我不想在不看它时渲染形状！

我错过了什么吗？

以下是“动画”康加系列的代码部分。现在它只是永久地添加了行，但这只是暂时的，直到我开始工作。

    this.blurb = function( scene ) { // function is called every frew frames to add a new shape

if ( blurbShapes && blurbShapes.length ) { // checks if the array is already populated by shapes

// makes a clone of the last geometry in the array and its mesh
    blurbCopy = blurbShapes[ blurbShapes.length - 1 ].geometry.clone();
    blurbMaterialCopy = blurbShapes[ blurbShapes.length - 1 ].material.clone();

// randomly jitters the vertices of the geometry a bit for variety
    for ( var i = 0; i < blurbCopy.vertices.length; i++ ) {

        blurbCopy.vertices[i].x += Math.random() - 0.5;
        blurbCopy.vertices[i].y += Math.random() - 0.5;
        blurbCopy.vertices[i].z += Math.random() - 2;
    }

// closes the loop by making the first vertex look at the last one
    blurbCopy.vertices[0] = blurbCopy.vertices[ blurbCopy.vertices.length - 1 ];
    blurbMaterialCopy.color.offsetHSL ( 0.01, 0, 0 );

// update vertex information -- but this doesn't seem to update where the camera thinks the geometry is!
    blurbCopy.verticesNeedUpdate = true;

// add the shape to the array
    blurbShapes.push( new THREE.Line( blurbCopy, blurbMaterialCopy ) );
    scene.add( blurbShapes[ blurbShapes.length - 1 ] );

} else { // first time

    color = new THREE.Color();
    color.setHSL( Math.random(), 0.7, 0.8 );
    material = new THREE.LineBasicMaterial( { color: color } ),
    geometry = new THREE.CircleGeometry( 32, 32 );

    // Remove center vertex and make it equal to the last vertex
    geometry.vertices[0] = geometry.vertices[ geometry.vertices.length - 1 ];
    geometry.verticesNeedUpdate = true;

    blurbShapes.push( new THREE.Line( geometry, material ) );
    scene.add( blurbShapes[0] );
}

}

编辑：添加阅读评论。

这是上下文的图片。在第一个康加的线条线是完全可见的; “第一”线位于图像的最右边，一半显示。在第二个图像中，我看起来略微偏离了“第一”线，因此它不在视野范围内，整个阵列都消失了。