javascript
/
three.js
镜像自地址 https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js raycast - texture</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
		<style>
			body {
				background-color: #fff;
				color: #444;
			}

			a {
				color: #08f;
			}

			#controls {
				position: absolute;
				text-align:left;
				top: 60px;
				left: 5px;
				padding: 5px;
			}

			.control { margin-bottom: 3px; }

			input { width: 50px; }
		</style>
	</head>
	<body>
		<div id="container"></div>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - raycast texture<br>Left to right: buffer geometry - geometry - indexed buffer geometry
			<fieldset id="controls">
				<legend>Circle</legend>
				<div class="control">
					WrapS : <select id="setwrapS">
						<option value="1001">ClampToEdgeWrapping</option>
						<option value="1000" selected>RepeatWrapping</option>
						<option value="1002">MirroredRepeatWrapping</option>
					</select>
				</div>
				<div class="control">
					WrapT : <select id="setwrapT">
						<option value="1001">ClampToEdgeWrapping</option>
						<option value="1000" selected>RepeatWrapping</option>
						<option value="1002">MirroredRepeatWrapping</option>
					</select>
				</div>
				<div class="control">
					Offset : X <input id="setOffsetU" type="number" value="0" step="0.05" />
					Y <input id="setOffsetV" type="number" value="0" step="0.05" /><br />
				</div>
				<div class="control">
					Repeat : X <input id="setRepeatU" type="number" value="1" step="0.1" />
					Y <input id="setRepeatV" type="number" value="1" step="0.1" />
				</div>
				<div class="control">
					Rotation : <input id="setRotation" type="number" value="0" step="0.1" />
				</div>
			</fieldset>
		</div>

		<!-- Import maps polyfill -->
		<!-- Remove this when import maps will be widely supported -->
		<script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			function CanvasTexture( parentTexture ) {

				this._canvas = document.createElement( 'canvas' );
				this._canvas.width = this._canvas.height = 1024;
				this._context2D = this._canvas.getContext( '2d' );

				if ( parentTexture ) {

					this._parentTexture.push( parentTexture );
					parentTexture.image = this._canvas;

				}

				const that = this;
				this._background = document.createElement( 'img' );
				this._background.addEventListener( 'load', function () {

					that._canvas.width = that._background.naturalWidth;
					that._canvas.height = that._background.naturalHeight;

					that._crossRadius = Math.ceil( Math.min( that._canvas.width, that._canvas.height / 30 ) );
					that._crossMax = Math.ceil( 0.70710678 * that._crossRadius );
					that._crossMin = Math.ceil( that._crossMax / 10 );
					that._crossThickness = Math.ceil( that._crossMax / 10 );

					that._draw();

				} );
				this._background.crossOrigin = '';
				this._background.src = 'textures/uv_grid_opengl.jpg';

				this._draw();

			}


			CanvasTexture.prototype = {

				constructor: CanvasTexture,

				_canvas: null,
				_context2D: null,
				_xCross: 0,
				_yCross: 0,

				_crossRadius: 57,
				_crossMax: 40,
				_crossMin: 4,
				_crossThickness: 4,

				_parentTexture: [],

				addParent: function ( parentTexture ) {

					if ( this._parentTexture.indexOf( parentTexture ) === - 1 ) {

						this._parentTexture.push( parentTexture );
						parentTexture.image = this._canvas;

					}

				},

				setCrossPosition: function ( x, y ) {

					this._xCross = x * this._canvas.width;
					this._yCross = y * this._canvas.height;

					this._draw();

				},

				_draw: function () {

					if ( ! this._context2D ) return;

					this._context2D.clearRect( 0, 0, this._canvas.width, this._canvas.height );

					// Background.
					this._context2D.drawImage( this._background, 0, 0 );

					// Yellow cross.
					this._context2D.lineWidth = this._crossThickness * 3;
					this._context2D.strokeStyle = '#FFFF00';

					this._context2D.beginPath();
					this._context2D.moveTo( this._xCross - this._crossMax - 2, this._yCross - this._crossMax - 2 );
					this._context2D.lineTo( this._xCross - this._crossMin, this._yCross - this._crossMin );

					this._context2D.moveTo( this._xCross + this._crossMin, this._yCross + this._crossMin );
					this._context2D.lineTo( this._xCross + this._crossMax + 2, this._yCross + this._crossMax + 2 );

					this._context2D.moveTo( this._xCross - this._crossMax - 2, this._yCross + this._crossMax + 2 );
					this._context2D.lineTo( this._xCross - this._crossMin, this._yCross + this._crossMin );

					this._context2D.moveTo( this._xCross + this._crossMin, this._yCross - this._crossMin );
					this._context2D.lineTo( this._xCross + this._crossMax + 2, this._yCross - this._crossMax - 2 );

					this._context2D.stroke();

					for ( let i = 0; i < this._parentTexture.length; i ++ ) {

						this._parentTexture[ i ].needsUpdate = true;

					}

				}

			};

			const width = window.innerWidth;
			const height = window.innerHeight;

			let canvas;
			let planeTexture, cubeTexture, circleTexture;

			let container;

			let camera, scene, renderer;

			const raycaster = new THREE.Raycaster();
			const mouse = new THREE.Vector2();
			const onClickPosition = new THREE.Vector2();

			init();
			render();

			function init() {

				container = document.getElementById( 'container' );

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xeeeeee );

				camera = new THREE.PerspectiveCamera( 45, width / height, 1, 1000 );
				camera.position.x = - 30;
				camera.position.y = 40;
				camera.position.z = 50;
				camera.lookAt( scene.position );

				renderer = new THREE.WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( width, height );
				container.appendChild( renderer.domElement );

				// A cube, in the middle.
				cubeTexture = new THREE.Texture( undefined, THREE.UVMapping, THREE.RepeatWrapping, THREE.RepeatWrapping );
				canvas = new CanvasTexture( cubeTexture );
				const cubeMaterial = new THREE.MeshBasicMaterial( { map: cubeTexture } );
				const cubeGeometry = new THREE.BoxGeometry( 20, 20, 20 );
				let uvs = cubeGeometry.attributes.uv.array;
				// Set a specific texture mapping.
				for ( let i = 0; i < uvs.length; i ++ ) {

					uvs[ i ] *= 2;

				}

				const cube = new THREE.Mesh( cubeGeometry, cubeMaterial );
				cube.position.x = 4;
				cube.position.y = - 5;
				cube.position.z = 0;
				scene.add( cube );

				// A plane on the left

				planeTexture = new THREE.Texture( undefined, THREE.UVMapping, THREE.MirroredRepeatWrapping, THREE.MirroredRepeatWrapping );
				canvas.addParent( planeTexture );
				const planeMaterial = new THREE.MeshBasicMaterial( { map: planeTexture } );
				const planeGeometry = new THREE.PlaneGeometry( 25, 25, 1, 1 );
				uvs = planeGeometry.attributes.uv.array;

				// Set a specific texture mapping.

				for ( let i = 0; i < uvs.length; i ++ ) {

					uvs[ i ] *= 2;

				}

				const plane = new THREE.Mesh( planeGeometry, planeMaterial );
				plane.position.x = - 16;
				plane.position.y = - 5;
				plane.position.z = 0;
				scene.add( plane );

				// A circle on the right.

				circleTexture = new THREE.Texture( undefined, THREE.UVMapping, THREE.RepeatWrapping, THREE.RepeatWrapping );
				canvas.addParent( circleTexture );
				const circleMaterial = new THREE.MeshBasicMaterial( { map: circleTexture } );
				const circleGeometry = new THREE.CircleGeometry( 25, 40, 0, Math.PI * 2 );
				uvs = circleGeometry.attributes.uv.array;

				// Set a specific texture mapping.

				for ( let i = 0; i < uvs.length; i ++ ) {

					uvs[ i ] = ( uvs[ i ] - 0.25 ) * 2;

				}

				const circle = new THREE.Mesh( circleGeometry, circleMaterial );
				circle.position.x = 24;
				circle.position.y = - 5;
				circle.position.z = 0;
				scene.add( circle );

				window.addEventListener( 'resize', onWindowResize );
				container.addEventListener( 'mousemove', onMouseMove );

				document.getElementById( 'setwrapS' ).addEventListener( 'change', setwrapS );
				document.getElementById( 'setwrapT' ).addEventListener( 'change', setwrapT );
				document.getElementById( 'setOffsetU' ).addEventListener( 'change', setOffsetU );
				document.getElementById( 'setOffsetV' ).addEventListener( 'change', setOffsetV );
				document.getElementById( 'setRepeatU' ).addEventListener( 'change', setRepeatU );
				document.getElementById( 'setRepeatV' ).addEventListener( 'change', setRepeatV );
				document.getElementById( 'setRotation' ).addEventListener( 'change', setRotation );

			}

			function onWindowResize() {

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

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

			}

			function onMouseMove( evt ) {

				evt.preventDefault();

				const array = getMousePosition( container, evt.clientX, evt.clientY );
				onClickPosition.fromArray( array );

				const intersects = getIntersects( onClickPosition, scene.children );

				if ( intersects.length > 0 && intersects[ 0 ].uv ) {

					const uv = intersects[ 0 ].uv;
					intersects[ 0 ].object.material.map.transformUv( uv );
					canvas.setCrossPosition( uv.x, uv.y );

				}

			}

			function getMousePosition( dom, x, y ) {

				const rect = dom.getBoundingClientRect();
				return [ ( x - rect.left ) / rect.width, ( y - rect.top ) / rect.height ];

			}

			function getIntersects( point, objects ) {

				mouse.set( ( point.x * 2 ) - 1, - ( point.y * 2 ) + 1 );

				raycaster.setFromCamera( mouse, camera );

				return raycaster.intersectObjects( objects, false );

			}

			function render() {

				requestAnimationFrame( render );
				renderer.render( scene, camera );

			}

			function setwrapS( event ) {

				circleTexture.wrapS = parseFloat( event.target.value );
				circleTexture.needsUpdate = true;

			}

			function setwrapT( event ) {

				circleTexture.wrapT = parseFloat( event.target.value );
				circleTexture.needsUpdate = true;

			}

			function setOffsetU( event ) {

				circleTexture.offset.x = parseFloat( event.target.value );

			}

			function setOffsetV( event ) {

				circleTexture.offset.y = parseFloat( event.target.value );

			}

			function setRepeatU( event ) {

				circleTexture.repeat.x = parseFloat( event.target.value );

			}

			function setRepeatV( event ) {

				circleTexture.repeat.y = parseFloat( event.target.value );

			}

			function setRotation( event ) {

				circleTexture.rotation = parseFloat( event.target.value );

			}

		</script>
	</body>
</html>