Javascript 如何在Three.js中创建鸡蛋网格？

我正在尝试在Three.js中创建一个鸡蛋网格。我已经用LatheGeometry编写了下面的代码，但是我缺少正确的等式。有人能帮忙吗

var r0 = 40
var r1 = r0/4;
var inc = Math.PI/r0;
points = [];
points.push( new THREE.Vector2( 0.0001, -r0/2 ) );
for ( var i = 0; i <= r0; i ++ ) {
    var def = i<r0/2 ? 0 : r1*Math.sin((i-r0/2)*inc);
    points.push( new THREE.Vector2( Math.sqrt(r0*i-i*i), i+def-r0/2 ) );
}
points.push( new THREE.Vector2( 0.0001, -r0/2 ) );
var geometry = new THREE.LatheGeometry( points, 30 );
var material = new THREE.MeshPhongMaterial( { color: 0xFFFF20 } );
Ovo = new THREE.Mesh( geometry, material );
Ovo.position.set(0, 20.1, 0);
scene.add( Ovo );

var r0=40
var r1=r0/4；
var inc=Math.PI/r0；
点数=[]；
点推（新的三矢量2（0.0001，-r0/2））；
对于（var i=0；i您可以创建一个“鸡蛋”几何体，如下所示：

// points - (x, y) pairs are rotated around the y-axis
var points = [];
for ( var deg = 0; deg <= 180; deg += 6 ) {

    var rad = Math.PI * deg / 180;
    var point = new THREE.Vector2( ( 0.72 + .08 * Math.cos( rad ) ) * Math.sin( rad ), - Math.cos( rad ) ); // the "egg equation"
    //console.log( point ); // x-coord should be greater than zero to avoid degenerate triangles; it is not in this formula.
    points.push( point );

}

geometry = new THREE.LatheBufferGeometry( points, 32 );

//点-（x，y）对绕y轴旋转
var点=[]；
对于（var deg=0；deg