初學THREE.JS的小白，
最近公司要求將客戶提供各「沙堆」取得的2D圖轉成3D ,
每個沙堆資料由有各六個X , Y數據組成。
如圖:

目前做法是先把X Y各六個點取出最大做來計重三角型重心點( Triangle.getMidpoint)
然用PolyhedronGeometry，將每個頂點連成面，但成果跟預想的差很遠。

    var Triangle = new THREE.Triangle()
    // 三角形顶点1
    Triangle.a = new THREE.Vector3(50, 0, 0);
    // 三角形顶点2
    Triangle.b = new THREE.Vector3(0, 0, 25);
    // 三角形顶点3
    Triangle.c = new THREE.Vector3(0, 10, 0);
    var Midpoint = new THREE.Vector3();
    // 计算三角形重心，结果保存在参数Midpoint
    Triangle.getMidpoint(Midpoint);

    const verticesOfCube = [
     Midpoint.x, Midpoint.y, Midpoint.z,
     50,0,0, 0,10,0,
        30, 0, 0, 0, 30, 0,
        0, 0, 0, 0, 10, 0,
        -20, 0, 0, 0, 5, 0, 
        -10,0,0,0,10,0
    ];

    const indicesOfFaces = [
        1, 0, 2,
        2, 0, 3,
        3, 0, 4,
        4, 0, 5,
        5, 0, 6,
        6, 0, 7,
        7, 0, 8,
        8, 0, 9,
        9, 0, 10,
        10, 0, 1,
        10,0,2
    ];

    geometry = new THREE.PolyhedronGeometry(verticesOfCube, indicesOfFaces, 100, 2);
    //const edges = new THREE.EdgesGeometry(geometry);
    const meshMaterial = new THREE.MeshBasicMaterial({ 
        color: new THREE.Color('black'),
        transparent: true, 
        opacity:0.7,
        DoubleSide:true
    }) 
  
    //const mesh = new THREE.LineSegments(edges, new THREE.LineBasicMaterial({
    //      color: new THREE.Color('black'),
      
    //})); 
        var mesh = new THREE.Mesh(geometry, meshMaterial)
    mesh.position.set(0, 0, 0) 
    scene.add(mesh) 

如圖: