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="http://threejs.org" target="_blank" rel="noopener">three.js</a> - raycast texture<br>Left to right: buffer geometry - geometry - indexed buffer geometry</div>
		<fieldset id="controls">
			<legend>Circle</legend>
			<div class="control">
				WrapS : <select onchange="setwrapS(this)">
					<option value="ClampToEdgeWrapping">ClampToEdgeWrapping</option>
					<option value="RepeatWrapping" selected>RepeatWrapping</option>
					<option value="MirroredRepeatWrapping">MirroredRepeatWrapping</option>
				</select>
			</div>
			<div class="control">
				WrapT : <select onchange="setwrapT(this)">
					<option value="ClampToEdgeWrapping">ClampToEdgeWrapping</option>
					<option value="RepeatWrapping" selected>RepeatWrapping</option>
					<option value="MirroredRepeatWrapping">MirroredRepeatWrapping</option>
				</select>
			</div>
			<div class="control">
				Offset : X <input type="number" value="0" step="0.05" onchange="setOffsetU(this)" />
				Y <input type="number" value="0" step="0.05" onchange="setOffsetV(this)" /><br />
			</div>
			<div class="control">
				Repeat : X <input type="number" value="1" step="0.1" onchange="setRepeatU(this)" />
				Y <input type="number" value="1" step="0.1" onchange="setRepeatV(this)" />
			</div>
			<div class="control">
				Rotation : <input type="number" value="0" step="0.1" onchange="setRotation(this)" />
			</div>
		</fieldset>
		<script src="../build/three.js"></script>
		<script>

			var CanvasTexture = function ( 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;

				}

				var 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();

				}, false );
				this._background.crossOrigin = '';
				this._background.src = "textures/UV_Grid_Sm.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 ( var i = 0; i < this._parentTexture.length; i ++ ) {

						this._parentTexture[ i ].needsUpdate = true;

					}

				}

			};

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

			var canvas;
			var planeTexture, cubeTexture, circleTexture;

			var container;

			var camera, scene, renderer;

			var raycaster = new THREE.Raycaster();
			var mouse = new THREE.Vector2();
			var 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 );
				var cubeMaterial = new THREE.MeshBasicMaterial( { map: cubeTexture } );
				var cubeGeometry = new THREE.BoxBufferGeometry( 20, 20, 20 );
				var uvs = cubeGeometry.attributes.uv.array;
				// Set a specific texture mapping.
				for ( var i = 0; i < uvs.length; i ++ ) {

					uvs[ i ] *= 2;

				}

				var 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 );
				var planeMaterial = new THREE.MeshBasicMaterial( { map: planeTexture } );
				var planeGeometry = new THREE.PlaneBufferGeometry( 25, 25, 1, 1 );
				var uvs = planeGeometry.attributes.uv.array;
				// Set a specific texture mapping.
				for ( var i = 0; i < uvs.length; i ++ ) {

					uvs[ i ] *= 2;

				}
				var 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 );
				var circleMaterial = new THREE.MeshBasicMaterial( { map: circleTexture } );
				var circleGeometry = new THREE.CircleBufferGeometry( 25, 40, 0, Math.PI * 2 );
				var uvs = circleGeometry.attributes.uv.array;
				// Set a specific texture mapping.
				for ( var i = 0; i < uvs.length; i ++ ) {

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

				}
				var 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, false );
				container.addEventListener( 'mousemove', onMouseMove, false );

			}

			function onWindowResize() {

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

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

			}

			function onMouseMove( evt ) {

				evt.preventDefault();

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

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

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

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

				}

			}

			var getMousePosition = function ( dom, x, y ) {

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

			};

			var getIntersects = function ( point, objects ) {

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

				raycaster.setFromCamera( mouse, camera );

				return raycaster.intersectObjects( objects );

			};

			function render() {

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

			}

			function setwrapS( that ) {

				circleTexture.wrapS = THREE[ that.value ];
				circleTexture.needsUpdate = true;

			}

			function setwrapT( that ) {

				circleTexture.wrapT = THREE[ that.value ];
				circleTexture.needsUpdate = true;

			}

			function setOffsetU( that ) {

				circleTexture.offset.x = parseFloat( that.value );

			}

			function setOffsetV( that ) {

				circleTexture.offset.y = parseFloat( that.value );

			}

			function setRepeatU( that ) {

				circleTexture.repeat.x = parseFloat( that.value );

			}

			function setRepeatV( that ) {

				circleTexture.repeat.y = parseFloat( that.value );

			}

			function setRotation( that ) {

				circleTexture.rotation = parseFloat( that.value );

			}

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