我正在努力找到将物体旋转到其中心的方法。此刻我可以旋转场景，但是当我进行旋转时，对象会离开用户。我在论坛的同一行中查看了一些已经提出的问题，但无法使其发挥作用。下面是我正在使用/附加的html / three.js文件的一部分你会找到完整的工作示例。非常感谢任何帮助
<script src="../build/three.min.js"></script>
<script src="js/controls/TrackballControls.js"></script>
<script src="js/libs/stats.min.js"></script>
<script>
var container, stats;
var camera, controls, scene, renderer;
var pickingData = [], pickingTexture, pickingScene;
var objects = [];
var highlightBox;
var splitCoord;
var avStdProp;
var mouse = new THREE.Vector2();
var offset = new THREE.Vector3( 10, 10, 10 );
var geom = new THREE.BoxGeometry(0.005, 0.005, 0.005 );
geom.colorsNeedUpdate = true;
init();
animate();
function init() {
container = document.getElementById( "container" );
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.x=250;
camera.position.y=300;
camera.position.z=400;
renderer = new THREE.WebGLRenderer( { antialias: true } );
controls = new THREE.TrackballControls(camera);
controls.rotateSpeed = 1.0;
controls.zoomSpeed = 4;
controls.panSpeed = 0.8;
controls.noZoom = false;
controls.noPan = false;
controls.staticMoving = true;
controls.dynamicDampingFactor = 0.3;
scene = new THREE.Scene();
pickingScene = new THREE.Scene();
pickingTexture = new THREE.WebGLRenderTarget(800, 800);
pickingTexture.minFilter = THREE.LinearFilter;
pickingTexture.generateMipmaps = false;
scene.add( new THREE.AmbientLight( 0x555555 ) );
var light = new THREE.SpotLight( 0xffffff, 1.5 );
light.position.set( 0, 500, 2000 );
scene.add( light );
var geometry = new THREE.Geometry(),
pickingGeometry = new THREE.Geometry(),
pickingMaterial = new THREE.MeshBasicMaterial( { vertexColors: THREE.VertexColors } ),
defaultMaterial = new THREE.MeshLambertMaterial({ color: 0xffffff, shading: THREE.FlatShading, vertexColors: THREE.VertexColors } );
function applyVertexColors( g, c ) {
g.faces.forEach( function( f ) {
var n = ( f instanceof THREE.Face3 ) ? 3 : 4;
for( var j = 0; j < n; j ++ ) {
f.vertexColors[ j ] = c;
}
} );
}
var color = new THREE.Color();
var matrix = new THREE.Matrix4();
var quaternion = new THREE.Quaternion();
var coord="219_163_189;130_173_179;161_113_231;92_103_176;169_193_180;161_165_187;262_163_166;198_143_155;161_189_155;125_121_107";
splitCoord=coord.split(";");
var coordColr="0_255_255;255_255_0;0_0_255;0_255_0;255_255_0;0_255_0;0_0_255;0_255_255;255_255_0;210_210_45";
var splitCoordColor=coordColr.split(";");
var avgStd="1_0;3_0;0_0;2_0;3_0;2_0;0_0;1_0;3_0;3_0.35";
avStdProp=avgStd.split(";");
for ( var i = 0; i < splitCoord.length; i++ ) {
var position = new THREE.Vector3();
var xyz=splitCoord[i].split("_");
var col=splitCoordColor[i].split("_");
position.x = xyz[0];
position.y = xyz[1];
position.z = xyz[2];
var rotation = new THREE.Euler();
rotation.x = 0
rotation.y = 0;
rotation.z = 0;
var scale = new THREE.Vector3();
scale.x = 200 + 100;
scale.y = 200 + 100;
scale.z = 200 + 100;
quaternion.setFromEuler( rotation, false );
matrix.compose( position, quaternion, scale );
// give the geom's vertices a random color, to be displayed
col[0]=col[0]/255;
col[1]=col[1]/255;
col[2]=col[2]/255;
applyVertexColors(geom, color.setRGB(col[0], col[1], col[2]));
geometry.merge( geom, matrix );
// give the geom's vertices a color corresponding to the "id"
applyVertexColors( geom, color.setHex( i ) );
pickingGeometry.merge( geom, matrix );
pickingData[ i ] = {
position: position,
rotation: rotation,
scale: scale
};
}
var drawnObject = new THREE.Mesh( geometry, defaultMaterial );
scene.add( drawnObject );
pickingScene.add( new THREE.Mesh( pickingGeometry, pickingMaterial ) );
highlightBox = new THREE.Mesh(
new THREE.BoxGeometry( 0.009, 0.009, 0.009 ),
new THREE.MeshLambertMaterial( { color: 0xffffff }
) );
scene.add( highlightBox );
//renderer.setClearColor( 0xffffff );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize(800,800);
renderer.sortObjects = false;
container.appendChild( renderer.domElement );
renderer.domElement.addEventListener( 'mousemove', onMouseMove );
}
//
function onMouseMove( e ) {
mouse.x = e.clientX;
mouse.y = e.clientY;
}
function pick() {
//render the picking scene off-screen
renderer.render( pickingScene, camera, pickingTexture );
//create buffer for reading single pixel
var pixelBuffer = new Uint8Array( 4 );
//read the pixel under the mouse from the texture
renderer.readRenderTargetPixels(pickingTexture, mouse.x+window.pageXOffset, pickingTexture.height - (mouse.y+window.pageYOffset), 1, 1, pixelBuffer);
//interpret the pixel as an ID
var id = ( pixelBuffer[0] << 16 ) | ( pixelBuffer[1] << 8 ) | ( pixelBuffer[2]);
var data = pickingData[ id ];
if (data) {
//move our highlightBox so that it surrounds the picked object
if (data.position && data.rotation && data.scale && controls.enabled){
highlightBox.position.copy( data.position );
highlightBox.rotation.copy( data.rotation );
highlightBox.scale.copy( data.scale ).add( offset );
highlightBox.visible = true;
}
}
else {
highlightBox.visible = false;
}
}
function animate() {
requestAnimationFrame( animate );
render();
//stats.update();
}
function render() {
controls.update();
pick();
renderer.render(scene, camera);
}
任何帮助？
答案 0 :(得分：0)
您可以将对象几何设置为居中，因此网格的中心将位于（0,0,0）位置，并且在旋转时不会“移开”。
这样做：
geometry.center();
var drawnObject = new THREE.Mesh( geometry, defaultMaterial );
scene.add( drawnObject );
<强>更新
因为您希望通过将几何体坐标保存到数组中以不寻常的方式使用拾取，所以几何体居中并不会对您有所帮助。您的问题是“在其中心旋转合并测量对象”，但您似乎想要围绕几何中心旋转相机。
计算几何体的边界球体并将控制目标设置为其位置：
drawnObject.geometry.computeBoundingSphere();
controls.target = drawnObject.geometry.boundingSphere.center;