three.js把2d路径转为3d对象

2d path to 3d object with three.js

three, extrude, geometry

《aframe.js 3d拼图代码详解》作品已被踏得网收录！

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JavaScript
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编译

JavaScript

var container;

var camera, scene, renderer, controls;

init();
animate();

function init() {
  renderer = new THREE.WebGLRenderer({alpha:true});
  renderer.setClearColor(0x000000, 0);
  renderer.setPixelRatio(window.devicePixelRatio);
  renderer.setSize(window.innerWidth, window.innerHeight);
  document.body.appendChild(renderer.domElement);

scene = new THREE.Scene();

camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 1000);
  camera.position.set(0, 0, 500);

controls = new THREE.TrackballControls(camera, renderer.domElement);
  controls.minDistance = 200;
  controls.maxDistance = 500;

scene.add(new THREE.AmbientLight(0x222222));

var light = new THREE.PointLight(0xffffff);
  light.position.copy(camera.position);
  scene.add(light);

var closedSpline = new THREE.ClosedSplineCurve3([
    new THREE.Vector3(-60, -100, 60),
    new THREE.Vector3(-60, 20, 60),
    new THREE.Vector3(-60, 120, 60),
    new THREE.Vector3(60, 20, -60),
    new THREE.Vector3(60, -100, -60)
  ]);

var extrudeSettings = {
    steps: 100,
    bevelEnabled: false,
    extrudePath: closedSpline
  };

var pts = [],
    count = 3;

for (var i = 0; i < count; i++) {

var l = 20;

var a = 2 * i / count * Math.PI;

pts.push(new THREE.Vector2(Math.cos(a) * l, Math.sin(a) * l));

}

var shape = new THREE.Shape(pts);

var geometry = new THREE.ExtrudeGeometry(shape, extrudeSettings);

var material = new THREE.MeshLambertMaterial({
    color: 0xb00000,
    wireframe: false
  });

var mesh = new THREE.Mesh(geometry, material);

scene.add(mesh);

var randomPoints = [];

for (var i = 0; i < 10; i++) {

randomPoints.push(new THREE.Vector3((i - 4.5) * 50, THREE.Math.randFloat(-50, 50), THREE.Math.randFloat(-50, 50)));

}

var randomSpline = new THREE.CatmullRomCurve3(randomPoints);

var extrudeSettings = {
    steps: 200,
    bevelEnabled: false,
    extrudePath: randomSpline
  };

var pts = [],
    numPts = 5;

for (var i = 0; i < numPts * 2; i++) {

var l = i % 2 == 1 ? 10 : 20;

var a = i / numPts * Math.PI;

pts.push(new THREE.Vector2(Math.cos(a) * l, Math.sin(a) * l));

}

var shape = new THREE.Shape(pts);

var geometry = new THREE.ExtrudeGeometry(shape, extrudeSettings);

var material2 = new THREE.MeshLambertMaterial({
    color: 0xff8000,
    wireframe: false
  });

var mesh = new THREE.Mesh(geometry, material2);

scene.add(mesh);

var materials = [material, material2];

var extrudeSettings = {
    amount: 20,
    steps: 1,
    material: 1,
    extrudeMaterial: 0,
    bevelEnabled: true,
    bevelThickness: 2,
    bevelSize: 4,
    bevelSegments: 1,
  };

var geometry = new THREE.ExtrudeGeometry(shape, extrudeSettings);

var mesh = new THREE.Mesh(geometry, new THREE.MeshFaceMaterial(materials));

mesh.position.set(50, 100, 50);

scene.add(mesh);
  window.addEventListener('resize', onWindowResize, false);
}

function animate() {

requestAnimationFrame(animate);

controls.update();

renderer.render(scene, camera);

}

function onWindowResize() {

windowHalfX = window.innerWidth / 2;
  windowHalfY = window.innerHeight / 2;

camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();

renderer.setSize(window.innerWidth, window.innerHeight);

}

编译

CSS

HTML

var _this = this;
	var STATE = { NONE: - 1, ROTATE: 0, ZOOM: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_ZOOM_PAN: 4 };

this.object = object;
	this.domElement = ( domElement !== undefined ) ? domElement : document;

// API

this.enabled = true;

this.screen = { left: 0, top: 0, width: 0, height: 0 };

this.rotateSpeed = 1.0;
	this.zoomSpeed = 1.2;
	this.panSpeed = 0.3;

this.noRotate = false;
	this.noZoom = false;
	this.noPan = false;

this.staticMoving = false;
	this.dynamicDampingFactor = 0.2;

this.minDistance = 0;
	this.maxDistance = Infinity;

this.keys = [ 65 /*A*/, 83 /*S*/, 68 /*D*/ ];

// internals

this.target = new THREE.Vector3();

var EPS = 0.000001;

var lastPosition = new THREE.Vector3();

var _state = STATE.NONE,
	_prevState = STATE.NONE,

_eye = new THREE.Vector3(),

_movePrev = new THREE.Vector2(),
	_moveCurr = new THREE.Vector2(),

_lastAxis = new THREE.Vector3(),
	_lastAngle = 0,

_zoomStart = new THREE.Vector2(),
	_zoomEnd = new THREE.Vector2(),

_touchZoomDistanceStart = 0,
	_touchZoomDistanceEnd = 0,

_panStart = new THREE.Vector2(),
	_panEnd = new THREE.Vector2();

// for reset

this.target0 = this.target.clone();
	this.position0 = this.object.position.clone();
	this.up0 = this.object.up.clone();

// events

var changeEvent = { type: 'change' };
	var startEvent = { type: 'start' };
	var endEvent = { type: 'end' };

// methods

this.handleResize = function () {

if ( this.domElement === document ) {

this.screen.left = 0;
			this.screen.top = 0;
			this.screen.width = window.innerWidth;
			this.screen.height = window.innerHeight;

} else {

var box = this.domElement.getBoundingClientRect();
			// adjustments come from similar code in the jquery offset() function
			var d = this.domElement.ownerDocument.documentElement;
			this.screen.left = box.left + window.pageXOffset - d.clientLeft;
			this.screen.top = box.top + window.pageYOffset - d.clientTop;
			this.screen.width = box.width;
			this.screen.height = box.height;

}

};

this.handleEvent = function ( event ) {

if ( typeof this[ event.type ] == 'function' ) {

this[ event.type ]( event );

}

};

var getMouseOnScreen = ( function () {

var vector = new THREE.Vector2();

return function getMouseOnScreen( pageX, pageY ) {

vector.set(
				( pageX - _this.screen.left ) / _this.screen.width,
				( pageY - _this.screen.top ) / _this.screen.height
			);

return vector;

};

}() );

var getMouseOnCircle = ( function () {

var vector = new THREE.Vector2();

return function getMouseOnCircle( pageX, pageY ) {

vector.set(
				( ( pageX - _this.screen.width * 0.5 - _this.screen.left ) / ( _this.screen.width * 0.5 ) ),
				( ( _this.screen.height + 2 * ( _this.screen.top - pageY ) ) / _this.screen.width ) // screen.width intentional
			);

return vector;

};

}() );

this.rotateCamera = ( function() {

var axis = new THREE.Vector3(),
			quaternion = new THREE.Quaternion(),
			eyeDirection = new THREE.Vector3(),
			objectUpDirection = new THREE.Vector3(),
			objectSidewaysDirection = new THREE.Vector3(),
			moveDirection = new THREE.Vector3(),
			angle;

return function rotateCamera() {

moveDirection.set( _moveCurr.x - _movePrev.x, _moveCurr.y - _movePrev.y, 0 );
			angle = moveDirection.length();

if ( angle ) {

_eye.copy( _this.object.position ).sub( _this.target );

eyeDirection.copy( _eye ).normalize();
				objectUpDirection.copy( _this.object.up ).normalize();
				objectSidewaysDirection.crossVectors( objectUpDirection, eyeDirection ).normalize();

objectUpDirection.setLength( _moveCurr.y - _movePrev.y );
				objectSidewaysDirection.setLength( _moveCurr.x - _movePrev.x );

moveDirection.copy( objectUpDirection.add( objectSidewaysDirection ) );

axis.crossVectors( moveDirection, _eye ).normalize();

angle *= _this.rotateSpeed;
				quaternion.setFromAxisAngle( axis, angle );

_eye.applyQuaternion( quaternion );
				_this.object.up.applyQuaternion( quaternion );

_lastAxis.copy( axis );
				_lastAngle = angle;

} else if ( ! _this.staticMoving && _lastAngle ) {

_lastAngle *= Math.sqrt( 1.0 - _this.dynamicDampingFactor );
				_eye.copy( _this.object.position ).sub( _this.target );
				quaternion.setFromAxisAngle( _lastAxis, _lastAngle );
				_eye.applyQuaternion( quaternion );
				_this.object.up.applyQuaternion( quaternion );

}

_movePrev.copy( _moveCurr );

};

}() );

this.zoomCamera = function () {

var factor;

if ( _state === STATE.TOUCH_ZOOM_PAN ) {

factor = _touchZoomDistanceStart / _touchZoomDistanceEnd;
			_touchZoomDistanceStart = _touchZoomDistanceEnd;
			_eye.multiplyScalar( factor );

} else {

factor = 1.0 + ( _zoomEnd.y - _zoomStart.y ) * _this.zoomSpeed;

if ( factor !== 1.0 && factor > 0.0 ) {

_eye.multiplyScalar( factor );

if ( _this.staticMoving ) {

_zoomStart.copy( _zoomEnd );

} else {

_zoomStart.y += ( _zoomEnd.y - _zoomStart.y ) * this.dynamicDampingFactor;

}

};

this.panCamera = ( function() {

var mouseChange = new THREE.Vector2(),
			objectUp = new THREE.Vector3(),
			pan = new THREE.Vector3();

return function panCamera() {

mouseChange.copy( _panEnd ).sub( _panStart );

if ( mouseChange.lengthSq() ) {

mouseChange.multiplyScalar( _eye.length() * _this.panSpeed );

pan.copy( _eye ).cross( _this.object.up ).setLength( mouseChange.x );
				pan.add( objectUp.copy( _this.object.up ).setLength( mouseChange.y ) );

_this.object.position.add( pan );
				_this.target.add( pan );

if ( _this.staticMoving ) {

_panStart.copy( _panEnd );

} else {

_panStart.add( mouseChange.subVectors( _panEnd, _panStart ).multiplyScalar( _this.dynamicDampingFactor ) );

}

};

}() );

this.checkDistances = function () {

if ( ! _this.noZoom || ! _this.noPan ) {

if ( _eye.lengthSq() > _this.maxDistance * _this.maxDistance ) {

_this.object.position.addVectors( _this.target, _eye.setLength( _this.maxDistance ) );
				_zoomStart.copy( _zoomEnd );

}

if ( _eye.lengthSq() < _this.minDistance * _this.minDistance ) {

_this.object.position.addVectors( _this.target, _eye.setLength( _this.minDistance ) );
				_zoomStart.copy( _zoomEnd );

}

};

this.update = function () {

_eye.subVectors( _this.object.position, _this.target );

if ( ! _this.noRotate ) {

_this.rotateCamera();

}

if ( ! _this.noZoom ) {

_this.zoomCamera();

}

if ( ! _this.noPan ) {

_this.panCamera();

}

_this.object.position.addVectors( _this.target, _eye );

_this.checkDistances();

_this.object.lookAt( _this.target );

if ( lastPosition.distanceToSquared( _this.object.position ) > EPS ) {

_this.dispatchEvent( changeEvent );

lastPosition.copy( _this.object.position );

}

};

this.reset = function () {

_state = STATE.NONE;
		_prevState = STATE.NONE;

_this.target.copy( _this.target0 );
		_this.object.position.copy( _this.position0 );
		_this.object.up.copy( _this.up0 );

_eye.subVectors( _this.object.position, _this.target );

_this.object.lookAt( _this.target );

_this.dispatchEvent( changeEvent );

lastPosition.copy( _this.object.position );

};

// listeners

function keydown( event ) {

if ( _this.enabled === false ) return;

window.removeEventListener( 'keydown', keydown );

_prevState = _state;

if ( _state !== STATE.NONE ) {

return;

} else if ( event.keyCode === _this.keys[ STATE.ROTATE ] && ! _this.noRotate ) {

_state = STATE.ROTATE;

} else if ( event.keyCode === _this.keys[ STATE.ZOOM ] && ! _this.noZoom ) {

_state = STATE.ZOOM;

} else if ( event.keyCode === _this.keys[ STATE.PAN ] && ! _this.noPan ) {

_state = STATE.PAN;

}

function keyup( event ) {

if ( _this.enabled === false ) return;

_state = _prevState;

window.addEventListener( 'keydown', keydown, false );

}

function mousedown( event ) {

if ( _this.enabled === false ) return;

event.preventDefault();
		event.stopPropagation();

if ( _state === STATE.NONE ) {

_state = event.button;

}

if ( _state === STATE.ROTATE && ! _this.noRotate ) {

_moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );
			_movePrev.copy( _moveCurr );

} else if ( _state === STATE.ZOOM && ! _this.noZoom ) {

_zoomStart.copy( getMouseOnScreen( event.pageX, event.pageY ) );
			_zoomEnd.copy( _zoomStart );

} else if ( _state === STATE.PAN && ! _this.noPan ) {

_panStart.copy( getMouseOnScreen( event.pageX, event.pageY ) );
			_panEnd.copy( _panStart );

}

document.addEventListener( 'mousemove', mousemove, false );
		document.addEventListener( 'mouseup', mouseup, false );

_this.dispatchEvent( startEvent );

}

function mousemove( event ) {

if ( _this.enabled === false ) return;

event.preventDefault();
		event.stopPropagation();

if ( _state === STATE.ROTATE && ! _this.noRotate ) {

_movePrev.copy( _moveCurr );
			_moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );

} else if ( _state === STATE.ZOOM && ! _this.noZoom ) {

_zoomEnd.copy( getMouseOnScreen( event.pageX, event.pageY ) );

} else if ( _state === STATE.PAN && ! _this.noPan ) {

_panEnd.copy( getMouseOnScreen( event.pageX, event.pageY ) );

}

function mouseup( event ) {

if ( _this.enabled === false ) return;

event.preventDefault();
		event.stopPropagation();

_state = STATE.NONE;

document.removeEventListener( 'mousemove', mousemove );
		document.removeEventListener( 'mouseup', mouseup );
		_this.dispatchEvent( endEvent );

}

function mousewheel( event ) {

if ( _this.enabled === false ) return;

event.preventDefault();
		event.stopPropagation();

var delta = 0;

if ( event.wheelDelta ) {

// WebKit / Opera / Explorer 9

delta = event.wheelDelta / 40;

} else if ( event.detail ) {

// Firefox

delta = - event.detail / 3;

}

_zoomStart.y += delta * 0.01;
		_this.dispatchEvent( startEvent );
		_this.dispatchEvent( endEvent );

}

function touchstart( event ) {

if ( _this.enabled === false ) return;

switch ( event.touches.length ) {

case 1:
				_state = STATE.TOUCH_ROTATE;
				_moveCurr.copy( getMouseOnCircle( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) );
				_movePrev.copy( _moveCurr );
				break;

case 2:
				_state = STATE.TOUCH_ZOOM_PAN;
				var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
				_touchZoomDistanceEnd = _touchZoomDistanceStart = Math.sqrt( dx * dx + dy * dy );

var x = ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX ) / 2;
				var y = ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY ) / 2;
				_panStart.copy( getMouseOnScreen( x, y ) );
				_panEnd.copy( _panStart );
				break;

default:
				_state = STATE.NONE;

}
		_this.dispatchEvent( startEvent );

}

function touchmove( event ) {

if ( _this.enabled === false ) return;

event.preventDefault();
		event.stopPropagation();

switch ( event.touches.length ) {

case 1:
				_movePrev.copy( _moveCurr );
				_moveCurr.copy( getMouseOnCircle(  event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) );
				break;

case 2:
				var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
				_touchZoomDistanceEnd = Math.sqrt( dx * dx + dy * dy );

var x = ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX ) / 2;
				var y = ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY ) / 2;
				_panEnd.copy( getMouseOnScreen( x, y ) );
				break;

default:
				_state = STATE.NONE;

}

function touchend( event ) {

if ( _this.enabled === false ) return;

switch ( event.touches.length ) {

case 1:
				_movePrev.copy( _moveCurr );
				_moveCurr.copy( getMouseOnCircle(  event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) );
				break;

case 2:
				_touchZoomDistanceStart = _touchZoomDistanceEnd = 0;

var x = ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX ) / 2;
				var y = ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY ) / 2;
				_panEnd.copy( getMouseOnScreen( x, y ) );
				_panStart.copy( _panEnd );
				break;

}

_state = STATE.NONE;
		_this.dispatchEvent( endEvent );

}

function contextmenu( event ) {

event.preventDefault();

}

this.dispose = function() {

this.domElement.removeEventListener( 'contextmenu', contextmenu, false );
		this.domElement.removeEventListener( 'mousedown', mousedown, false );
		this.domElement.removeEventListener( 'mousewheel', mousewheel, false );
		this.domElement.removeEventListener( 'MozMousePixelScroll', mousewheel, false ); // firefox

this.domElement.removeEventListener( 'touchstart', touchstart, false );
		this.domElement.removeEventListener( 'touchend', touchend, false );
		this.domElement.removeEventListener( 'touchmove', touchmove, false );

document.removeEventListener( 'mousemove', mousemove, false );
		document.removeEventListener( 'mouseup', mouseup, false );

window.removeEventListener( 'keydown', keydown, false );
		window.removeEventListener( 'keyup', keyup, false );

}

this.domElement.addEventListener( 'contextmenu', contextmenu, false );
	this.domElement.addEventListener( 'mousedown', mousedown, false );
	this.domElement.addEventListener( 'mousewheel', mousewheel, false );
	this.domElement.addEventListener( 'MozMousePixelScroll', mousewheel, false ); // firefox

this.domElement.addEventListener( 'touchstart', touchstart, false );
	this.domElement.addEventListener( 'touchend', touchend, false );
	this.domElement.addEventListener( 'touchmove', touchmove, false );

window.addEventListener( 'keydown', keydown, false );
	window.addEventListener( 'keyup', keyup, false );

this.handleResize();

// force an update at start
	this.update();

};

THREE.TrackballControls.prototype = Object.create( THREE.EventDispatcher.prototype );
THREE.TrackballControls.prototype.constructor = THREE.TrackballControls;
</script>

2d path to 3d object with three.js

three, extrude, geometry

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2d path to 3d object with three.js

three, extrude, geometry

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