从导入的.obj模型中拖动顶点

分类：编程问答

如何解决从导入的.obj模型中拖动顶点

这可能是菜鸟的错误，但是我坚持了好几个小时，所以我想我会在这里问。我是three.js的新手，但在论坛上浏览时发现some good examples of mesh editing and managing a imported model，但是在改写我的代码to this example之后，我现在卡住了。

我想拖动模型的顶点，但是当我尝试单击顶点时，我有<a class='gotoLine' href='#140:42'>140:42</a> Uncaught ReferenceError: points is not defined"

我似乎无法在var points之外获得function object，否则我会出现黑屏。

下一个挑战将是exporting it to GLTF并成为3D打印机。

编辑：我设法更改了顶点，但是我的模型不会相应地转换为网格。经过测试，我发现即使我有

，彼此之间也有很多顶点

geometry.mergeVertices(); geometry.computeFaceNormals(); geometry.computeVertexNormals();

已启用。

这是我现在的代码： https://jsfiddle.net/felipefsalazar/j9c1L6yr/6/ 

//SETUP DA TELA
var points,geometry;
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75,window.innerWidth / window.innerHeight,0.1,1000);
camera.position.set(0,5,10);
var renderer = new THREE.WebGLRenderer();
renderer.setClearColor(0x404040);
renderer.setSize(window.innerWidth,window.innerHeight);
document.body.appendChild(renderer.domElement);

//CONTROLE com o MOUSE
var controls = new THREE.OrbitControls(camera,renderer.domElement);

//LUZ
var light = new THREE.DirectionalLight(0xffffff,0.5);
light.position.setScalar(100);
scene.add(light);
scene.add(new THREE.AmbientLight(0xffffff,0.5));

//GRID CINZA NA TELA
scene.add(new THREE.GridHelper(100,100));

//LOAD DO OBJETO
var objLoader = new THREE.OBJLoader();

objLoader.load('https://raw.githubusercontent.com/felipefsalazar/venus/master/venuspeq.obj',function(object) {

    child = object.children[0];
    geometry = new THREE.Geometry().fromBufferGeometry(child.geometry);
    geometry.computeFaceNormals();
    geometry.mergeVertices(geometry);
    geometry.computeVertexNormals();
    geometry = new THREE.BufferGeometry().fromGeometry(geometry);

    scene.add(object);

    //MALHA DA ESTATUA
    var plane = new THREE.Mesh(geometry,new THREE.MeshBasicMaterial({
      wireframe: true,color: "blue"
    }));
    scene.add(plane);

    //PONTOS NA ESTÁTUA PARA MEXER
    points = new THREE.Points(geometry,new THREE.PointsMaterial({
      size: 0.25,color: "yellow"
    }));
    scene.add(points);


    //MALHA DA ESTATUA (wireframe)
    venuspeq = new THREE.Mesh(geometry,mesh);

    //ROTAÇÃO DO OBJETO
    //object.rotation.x = -Math.PI * 0.5;

    //BOX DE AJUDA DO OBJETO
    //var box = new THREE.Box3().setFromObject(object);
    //var box3Helper = new THREE.Box3Helper(box);
    //scene.add(box3Helper);



  });


var raycaster = new THREE.Raycaster();
raycaster.params.Points.threshold = 0.25;
var mouse = new THREE.Vector2();
var intersects = null;
var plane = new THREE.Plane();
var planeNormal = new THREE.Vector3();
var currentIndex = null;
var planePoint = new THREE.Vector3();
var dragging = false;

window.addEventListener("mousedown",mouseDown,false);
window.addEventListener("mousemove",mouseMove,false);
window.addEventListener("mouseup",mouseUp,false);



function mouseDown(event) {
  setRaycaster(event);
  getIndex();
  dragging = true;
    if (currentIndex != null){
        controls.enabled = false;
        }
}

function mouseMove(event) {
  if (dragging && currentIndex !== null) {
    setRaycaster(event);
    raycaster.ray.intersectPlane(plane,planePoint);
    geometry.attributes.position.setXYZ(currentIndex,planePoint.x,planePoint.y,planePoint.z);
    geometry.attributes.position.needsUpdate = true;
  }
}

function mouseUp(event) {
  dragging = false;
  currentIndex = null;
    controls.enabled = true;
}

function getIndex() {
  intersects = raycaster.intersectObject(points);
  if (intersects.length === 0) {
    currentIndex = null;
    return;
  }
  currentIndex = intersects[0].index;
  setPlane(intersects[0].point);
}

function setPlane(point) {
  planeNormal.subVectors(camera.position,point).normalize();
  plane.setFromNormalAndCoplanarPoint(planeNormal,point);
}

function setRaycaster(event) {
  getMouse(event);
  raycaster.setFromCamera(mouse,camera);
}

function getMouse(event) {
  mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
  mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
}


//RENDER
function render() {
  requestAnimationFrame(render);
  renderer.render(scene,camera);
}
render();
body {
  overflow: hidden;
  margin: 0;
}
<script src="https://threejs.org/build/three.min.js"></script>
<script src="https://threejs.org/examples/js/loaders/OBJLoader.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>

解决方法

您的问题在于JavaScript范围。您必须确保points在整个代码中可用，而不仅仅是在单个函数中可用。例如：

function init() {
   var points = 1;
}

// This will not work because points is only available
// inside the init function
init();
console.log(points);

要解决此问题，请在函数外声明变量，以将其作用域提高一级：

var points;
function init() {
    points = 1;
}

// Now you'll get the desired output of 1
init();
console.log(points);

有关固定版本，请参见此处。注意，我必须在代码的开头声明两个var points,geometry;，以便它们在所有函数中都可用：

//SETUP DA TELA
var points,geometry;
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75,window.innerWidth / window.innerHeight,0.1,1000);
camera.position.set(0,5,10);
var renderer = new THREE.WebGLRenderer();
renderer.setClearColor(0x404040);
renderer.setSize(window.innerWidth,window.innerHeight);
document.body.appendChild(renderer.domElement);

//CONTROLE com o MOUSE
var controls = new THREE.OrbitControls(camera,renderer.domElement);

//LUZ
var light = new THREE.DirectionalLight(0xffffff,0.5);
light.position.setScalar(100);
scene.add(light);
scene.add(new THREE.AmbientLight(0xffffff,0.5));

//GRID CINZA NA TELA
scene.add(new THREE.GridHelper(100,100));

//LOAD DO OBJETO
var objLoader = new THREE.OBJLoader();

objLoader.load('https://raw.githubusercontent.com/felipefsalazar/venus/master/venuspeq.obj',function(object) {

    child = object.children[0];
    geometry = new THREE.Geometry().fromBufferGeometry(child.geometry);
    geometry.computeFaceNormals();
    //geometry.mergeVertices();
    geometry.computeVertexNormals();
    geometry = new THREE.BufferGeometry().fromGeometry(geometry);

    scene.add(object);

    //MALHA DA ESTATUA
    var plane = new THREE.Mesh(geometry,new THREE.MeshBasicMaterial({
      wireframe: true,color: "blue"
    }));
    scene.add(plane);

    //PONTOS NA ESTÁTUA PARA MEXER
    points = new THREE.Points(geometry,new THREE.PointsMaterial({
      size: 0.15,color: "red"
    }));
    scene.add(points);


    //MALHA DA ESTATUA (wireframe)
    //venuspeq = new THREE.Mesh(geometry,mesh);

    //ROTAÇÃO DO OBJETO
    //object.rotation.x = -Math.PI * 0.5;

    //BOX DE AJUDA DO OBJETO
    //var box = new THREE.Box3().setFromObject(object);
    //var box3Helper = new THREE.Box3Helper(box);
    //scene.add(box3Helper);



  });


var raycaster = new THREE.Raycaster();
raycaster.params.Points.threshold = 0.15;
var mouse = new THREE.Vector2();
var intersects = null;
var plane = new THREE.Plane();
var planeNormal = new THREE.Vector3();
var currentIndex = null;
var planePoint = new THREE.Vector3();
var dragging = false;

window.addEventListener("mousedown",mouseDown,false);
window.addEventListener("mousemove",mouseMove,false);
window.addEventListener("mouseup",mouseUp,false);



function mouseDown(event) {
  setRaycaster(event);
  getIndex();
  dragging = true;
}

function mouseMove(event) {
  if (dragging && currentIndex !== null) {
    setRaycaster(event);
    raycaster.ray.intersectPlane(plane,planePoint);
    geometry.attributes.position.setXYZ(currentIndex,planePoint.x,planePoint.y,planePoint.z);
    geometry.attributes.position.needsUpdate = true;
  }
}

function mouseUp(event) {
  dragging = false;
  currentIndex = null;
}

function getIndex() {
  intersects = raycaster.intersectObject(points);
  if (intersects.length === 0) {
    currentIndex = null;
    return;
  }
  currentIndex = intersects[0].index;
  setPlane(intersects[0].point);
}

function setPlane(point) {
  planeNormal.subVectors(camera.position,point).normalize();
  plane.setFromNormalAndCoplanarPoint(planeNormal,point);
}

function setRaycaster(event) {
  getMouse(event);
  raycaster.setFromCamera(mouse,camera);
}

function getMouse(event) {
  mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
  mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
}



//RENDER
function render() {
  requestAnimationFrame(render);
  renderer.render(scene,camera);
}
render();
body {
  overflow: hidden;
  margin: 0;
}
<script src="https://threejs.org/build/three.min.js"></script>
<script src="https://threejs.org/examples/js/loaders/OBJLoader.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>

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