Javascript ThreeJS:将边几何图形应用于箭头辅助对象
我正在尝试使用ThreeJS中的ArrowHelper创建箭头:Javascript ThreeJS:将边几何图形应用于箭头辅助对象,javascript,three.js,Javascript,Three.js,我正在尝试使用ThreeJS中的ArrowHelper创建箭头: let arrow = new THREE.ArrowHelper(direction.normalize(), new THREE.Vector3(), length, color, headLength, headWidth); 此外,我想使用一个单独的边缘颜色。我意识到我需要使用三边几何,但如何应用它我不太明白。有人能帮我吗 更新 抱歉搞混了,我以为箭头用的是金字塔,不是圆锥体。有没有办法将圆锥体替换为棱锥体,并对边缘使用
let arrow = new THREE.ArrowHelper(direction.normalize(), new THREE.Vector3(), length, color, headLength, headWidth);
此外,我想使用一个单独的边缘颜色。我意识到我需要使用三边几何,但如何应用它我不太明白。有人能帮我吗
更新
抱歉搞混了,我以为箭头用的是金字塔,不是圆锥体。有没有办法将圆锥体替换为棱锥体,并对边缘使用不同的颜色
更新
谢谢你们的回答,他们真的很有帮助。我最终创建了自定义arrow类(从ArrowHelper复制了大部分代码):
class CustomArrow扩展了三个.Object3D{
构造器(方向、原点、长度、颜色、边缘颜色、头长、头宽){
超级();
//假设dir是标准化的
this.type='CustomArrow';
如果(dir===未定义)dir=new-THREE.Vector3(0,0,1);
如果(原点===未定义)原点=新的三个向量3(0,0,0);
如果(长度===未定义)长度=1;
如果(颜色===未定义)颜色=0xffff00;
如果(头长===未定义)头长=0.2*长度;
如果(头宽===未定义)头宽=0.2*头长;
如果(此._lineGeometry==未定义){
这个._lineGeometry=new THREE.BufferGeometry();
这个.u lineGeometry.setAttribute('position',新的三个.Float32BufferAttribute([0,0,0,0,1,0],3));
这个._conegometry=新的三个.ConeBufferGeometry(0.5,1,6);
这是计量学翻译(0,-0.5,0);
这个。_轴=新的3.Vector3();
}
本.位置.副本(原件);
this.line=new THREE.line(this._lineGeometry,new THREE.LineBasicMaterial({color:color,toneMapped:false,linewidth:4}));
this.line.matrixAutoUpdate=false;
this.add(this.line)
//基材
this.cone=new THREE.Mesh(this.u conegometry,new THREE.MeshBasicMaterial({color:color,toneMapped:false}));
this.add(this.cone);
//线框
this.wireframe=新的三点网格(此._几何,新的三点网格基本材质({
颜色:edgeColor,
色调映射:假,
线框:对,
线框线宽:2});
this.add(this.wireframe);
这是设置方向(dir);
此设置长度(长度、头长、头宽);
}
设置方向(dir){
//假设dir是标准化的
如果(y方向>0.99999){
这个四元数集合(0,0,0,1);
}否则如果(y方向<-0.99999){
这个四元数集合(1,0,0,0);
}否则{
这个.u轴集合(dir.z,0,-dir.x).normalize();
常数弧度=数学acos(方向y);
this.quaternion.setFromAxisAngle(this.\u轴,弧度);
}
}
设置长度(长度、头长、头宽){
如果(头长===未定义)头长=0.2*长度;
如果(头宽===未定义)头宽=0.2*头长;
this.line.scale.set(1,Math.max(0.0001,长度-头长),1);//参见#17458
this.line.updateMatrix();
此.cone.scale.set(头宽、头长、头宽);
此.cone.position.y=长度;
this.cone.updateMatrix();
此.wireframe.scale.set(头宽、头长、头宽);
此.wireframe.position.y=长度;
this.wireframe.updateMatrix();
}
设置颜色(颜色){
此.line.material.color.set(颜色);
//这个。圆锥。材质。颜色。设置(颜色);
//此.线框.材质.颜色.设置(颜色);
}
副本(来源){
超级副本(来源,错误);
此.line.copy(source.line);
此.cone.copy(source.cone);
此.wireframe.copy(source.wireframe);
归还这个;
}
}
出于某些原因,线宽和线框线宽不影响线宽。知道为什么吗?您可以像这样更改箭头圆锥体的颜色:
正文{
溢出:隐藏;
保证金:0;
}
从“导入*为三”https://threejs.org/build/three.module.js";
从导入{OrbitControls}”https://threejs.org/examples/jsm/controls/OrbitControls.js";
让场景=新的三个。场景();
让摄像头=新的三个透视摄像头(60,内宽/内高,
1, 100);
摄像机位置设置(0,5,10);
让renderer=new THREE.WebGLRenderer();
设置大小(innerWidth,innerHeight);
document.body.appendChild(renderer.doElement);
新的轨道控件(摄影机、渲染器、DomeElement);
scene.add(新的THREE.GridHelper());
//不同颜色
设ah=新的三个。箭头辅助对象(
新的三个向量3(0,1,0),
新的三矢量3(-4,0,0),
5.
“洋红”/*默认颜色*/);
啊。圆锥体。材质。颜色。套装(“红色”);//改变圆锥体的颜色
场景。添加(啊);
//彩色金字塔
设cg=new-THREE.SphereBufferGeometry(0.5,4,2).toNonIndexed();
设pos=cg.attributes.position;
for(设i=0;i{
颜色。推送(c.r、c.g、c.b);
颜色。推送(c.r、c.g、c.b);
颜色。推送(c.r、c.g、c.b);
});
}
cg.setAttribute(“color”,新的三个属性(colors,3));
设cm=新的3.MeshBasicMaterial({vertexColors:true});
设co=新的三网格(cg,cm);
co刻度盘组(1,5,1);
场景。添加(co);
renderer.setAnimationLoop(()=>{
渲染器。渲染(场景、摄影机);
});
您可以如下更改箭头圆锥体的颜色:
正文{
溢出:隐藏;
保证金:0;
}
进口
class CustomArrow extends THREE.Object3D {
constructor( dir, origin, length, color, edgeColor, headLength, headWidth ) {
super();
// dir is assumed to be normalized
this.type = 'CustomArrow';
if ( dir === undefined ) dir = new THREE.Vector3( 0, 0, 1 );
if ( origin === undefined ) origin = new THREE.Vector3( 0, 0, 0 );
if ( length === undefined ) length = 1;
if ( color === undefined ) color = 0xffff00;
if ( headLength === undefined ) headLength = 0.2 * length;
if ( headWidth === undefined ) headWidth = 0.2 * headLength;
if ( this._lineGeometry === undefined ) {
this._lineGeometry = new THREE.BufferGeometry();
this._lineGeometry.setAttribute( 'position', new THREE.Float32BufferAttribute( [ 0, 0, 0, 0, 1, 0 ], 3 ) );
this._coneGeometry = new THREE.ConeBufferGeometry( 0.5, 1, 6);
this._coneGeometry.translate( 0, - 0.5, 0 );
this._axis = new THREE.Vector3();
}
this.position.copy( origin );
this.line = new THREE.Line( this._lineGeometry, new THREE.LineBasicMaterial( { color: color, toneMapped: false, linewidth: 4 } ) );
this.line.matrixAutoUpdate = false;
this.add( this.line )
// base material
this.cone = new THREE.Mesh( this._coneGeometry, new THREE.MeshBasicMaterial( { color: color, toneMapped: false } ) );
this.add(this.cone);
// wire frame
this.wireframe = new THREE.Mesh( this._coneGeometry, new THREE.MeshBasicMaterial( {
color: edgeColor,
toneMapped: false,
wireframe: true,
wireframeLinewidth: 2 } ) );
this.add(this.wireframe);
this.setDirection( dir );
this.setLength( length, headLength, headWidth );
}
setDirection( dir ) {
// dir is assumed to be normalized
if ( dir.y > 0.99999 ) {
this.quaternion.set( 0, 0, 0, 1 );
} else if ( dir.y < - 0.99999 ) {
this.quaternion.set( 1, 0, 0, 0 );
} else {
this._axis.set( dir.z, 0, - dir.x ).normalize();
const radians = Math.acos( dir.y );
this.quaternion.setFromAxisAngle( this._axis, radians );
}
}
setLength( length, headLength, headWidth ) {
if ( headLength === undefined ) headLength = 0.2 * length;
if ( headWidth === undefined ) headWidth = 0.2 * headLength;
this.line.scale.set( 1, Math.max( 0.0001, length - headLength ), 1 ); // see #17458
this.line.updateMatrix();
this.cone.scale.set( headWidth, headLength, headWidth );
this.cone.position.y = length;
this.cone.updateMatrix();
this.wireframe.scale.set( headWidth, headLength, headWidth );
this.wireframe.position.y = length;
this.wireframe.updateMatrix();
}
setColor( color ) {
this.line.material.color.set( color );
// this.cone.material.color.set( color );
// this.wireframe.material.color.set( color );
}
copy( source ) {
super.copy( source, false );
this.line.copy( source.line );
this.cone.copy( source.cone );
this.wireframe.copy( source.wireframe );
return this;
}
}
_coneGeometry = new CylinderBufferGeometry( 0, 0.5, 1, 5, 1 );
_coneGeometry = new ConeBufferGeometry( 0.5, 1, 4);
let wireframeMaterial = new THREE.MeshBasicMaterial({color: "aqua", wireframe: true});
let coneEdgeMesh = new THREE.Mesh(_coneGeometry, wireframeMaterial);
let coneEdgeGeometry = new THREE.EdgesGeometry(arrow.cone.geometry);
let line = new THREE.LineSegments( coneEdgeGeometry, new THREE.LineBasicMaterial( { color: 0xffffff } ) );
arrow.add(line);