A gentleman is a good man or a good man.

A gentleman is a good man or a good man.

Gender is not the same, good or false. Also, Threejs introduces TrackballControls to view the scenario.

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The following are the key code for introducing the TrackballControls library in the html source file. camera and renderer must have some knowledge of Threejs before they can be understood:

<script>var controls;controls = new THREE.TrackballControls( camera, renderer.domElement );function animate() {requestAnimationFrame( animate, renderer.domElement );controls.update();renderer.render( scene, camera );}</script>

The following code is owned by the original author, but the latest code is not found in the following two websites. You can refer to some similar available code.

The original code of js/controls/TrackballControls. js referenced in the above Code can be copied to create TrackballControls. js and introduced, and can be used as follows:

/** * @author Eberhard Graether / http://egraether.com/ * @author Mark Lundin / http://mark-lundin.com */THREE.TrackballControls = function ( object, domElement ) {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;// APIthis.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.noRoll = false;this.staticMoving = false;this.dynamicDampingFactor = 0.2;this.minDistance = 0;this.maxDistance = Infinity;this.keys = [ 65 /*A*/, 83 /*S*/, 68 /*D*/ ];// internalsthis.target = new THREE.Vector3();var EPS = 0.000001;var lastPosition = new THREE.Vector3();var _state = STATE.NONE,_prevState = STATE.NONE,_eye = new THREE.Vector3(),_rotateStart = new THREE.Vector3(),_rotateEnd = new THREE.Vector3(),_zoomStart = new THREE.Vector2(),_zoomEnd = new THREE.Vector2(),_touchZoomDistanceStart = 0,_touchZoomDistanceEnd = 0,_panStart = new THREE.Vector2(),_panEnd = new THREE.Vector2();// for resetthis.target0 = this.target.clone();this.position0 = this.object.position.clone();this.up0 = this.object.up.clone();// eventsvar changeEvent = { type: 'change' };var startEvent = { type: 'start'};var endEvent = { type: 'end'};// methodsthis.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() functionvar 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 ( pageX, pageY ) {vector.set(( pageX - _this.screen.left ) / _this.screen.width,( pageY - _this.screen.top ) / _this.screen.height);return vector;};}() );var getMouseProjectionOnBall = ( function () {var vector = new THREE.Vector3();var objectUp = new THREE.Vector3();var mouseOnBall = new THREE.Vector3();return function ( pageX, pageY ) {mouseOnBall.set(( pageX - _this.screen.width * 0.5 - _this.screen.left ) / (_this.screen.width*.5),( _this.screen.height * 0.5 + _this.screen.top - pageY ) / (_this.screen.height*.5),0.0);var length = mouseOnBall.length();if ( _this.noRoll ) {if ( length < Math.SQRT1_2 ) {mouseOnBall.z = Math.sqrt( 1.0 - length*length );} else {mouseOnBall.z = .5 / length;}} else if ( length > 1.0 ) {mouseOnBall.normalize();} else {mouseOnBall.z = Math.sqrt( 1.0 - length * length );}_eye.copy( _this.object.position ).sub( _this.target );vector.copy( _this.object.up ).setLength( mouseOnBall.y )vector.add( objectUp.copy( _this.object.up ).cross( _eye ).setLength( mouseOnBall.x ) );vector.add( _eye.setLength( mouseOnBall.z ) );return vector;};}() );this.rotateCamera = (function(){var axis = new THREE.Vector3(),quaternion = new THREE.Quaternion();return function () {var angle = Math.acos( _rotateStart.dot( _rotateEnd ) / _rotateStart.length() / _rotateEnd.length() );if ( angle ) {axis.crossVectors( _rotateStart, _rotateEnd ).normalize();angle *= _this.rotateSpeed;quaternion.setFromAxisAngle( axis, -angle );_eye.applyQuaternion( quaternion );_this.object.up.applyQuaternion( quaternion );_rotateEnd.applyQuaternion( quaternion );if ( _this.staticMoving ) {_rotateStart.copy( _rotateEnd );} else {quaternion.setFromAxisAngle( axis, angle * ( _this.dynamicDampingFactor - 1.0 ) );_rotateStart.applyQuaternion( quaternion );}}}}());this.zoomCamera = function () {if ( _state === STATE.TOUCH_ZOOM_PAN ) {var factor = _touchZoomDistanceStart / _touchZoomDistanceEnd;_touchZoomDistanceStart = _touchZoomDistanceEnd;_eye.multiplyScalar( factor );} else {var 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 () {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 ) );}if ( _eye.lengthSq() < _this.minDistance * _this.minDistance ) {_this.object.position.addVectors( _this.target, _eye.setLength( _this.minDistance ) );}}};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 );};// listenersfunction 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 ) {_rotateStart.copy( getMouseProjectionOnBall( event.pageX, event.pageY ) );_rotateEnd.copy( _rotateStart );} 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 ) {_rotateEnd.copy( getMouseProjectionOnBall( 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 9delta = event.wheelDelta / 40;} else if ( event.detail ) { // Firefoxdelta = - 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;_rotateStart.copy( getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) );_rotateEnd.copy( _rotateStart );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:_rotateEnd.copy( getMouseProjectionOnBall( 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:_rotateEnd.copy( getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) );_rotateStart.copy( _rotateEnd );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 );}this.domElement.addEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, false );this.domElement.addEventListener( 'mousedown', mousedown, false );this.domElement.addEventListener( 'mousewheel', mousewheel, false );this.domElement.addEventListener( 'DOMMouseScroll', mousewheel, false ); // firefoxthis.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 startthis.update();};THREE.TrackballControls.prototype = Object.create( THREE.EventDispatcher.prototype );

Explanation: A gentleman is not a different person, and a good man is also a good man.

A gentleman is no different from a common person, but he is good at learning external things.

A gentleman is also a good man or a fake thing. What is a fake word?

It is a sentence in "Persuasion. It means that a person with a high moral character does not have extraordinary talents, but is good at using external things.
Here, the false is: Borrow, borrow, and use.