examples/webgl_raycaster_texture.html

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		<title>three.js raycaster - texture</title>
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		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> raycaster - texture
		</div>

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

		<script type="module">

			import * as THREE from 'three';

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

			const WRAPPING = {
				'RepeatWrapping': THREE.RepeatWrapping,
				'ClampToEdgeWrapping': THREE.ClampToEdgeWrapping,
				'MirroredRepeatWrapping': THREE.MirroredRepeatWrapping
			};

			const params = {
				wrapS: THREE.RepeatWrapping,
				wrapT: THREE.RepeatWrapping,
				offsetX: 0,
				offsetY: 0,
				repeatX: 1,
				repeatY: 1,
				rotation: 0,
			};


			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();

			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 );
				renderer.setAnimationLoop( animate );
				container.appendChild( renderer.domElement );

				// A cube, in the middle.
				cubeTexture = new THREE.Texture( undefined, THREE.UVMapping, THREE.RepeatWrapping, THREE.RepeatWrapping );
				cubeTexture.colorSpace = THREE.SRGBColorSpace;
				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 );
				planeTexture.colorSpace = THREE.SRGBColorSpace;
				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 );
				circleTexture.colorSpace = THREE.SRGBColorSpace;
				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 );

				//

				const gui = new GUI();
				gui.title( 'Circle Texture Settings' );

				gui.add( params, 'wrapS', WRAPPING ).onChange( setwrapS );
				gui.add( params, 'wrapT', WRAPPING ).onChange( setwrapT );
				gui.add( params, 'offsetX', 0, 5 );
				gui.add( params, 'offsetY', 0, 5 );
				gui.add( params, 'repeatX', 0, 5 );
				gui.add( params, 'repeatY', 0, 5 );
				gui.add( params, 'rotation', 0, 2 * Math.PI );
				gui.open();

			}

			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 animate() {

				// update texture parameters

				circleTexture.offset.x = params.offsetX;
				circleTexture.offset.y = params.offsetY;
				circleTexture.repeat.x = params.repeatX;
				circleTexture.repeat.y = params.repeatY;
				circleTexture.rotation = params.rotation;

				//

				renderer.render( scene, camera );

			}

			function setwrapS( value ) {

				circleTexture.wrapS = value;
				circleTexture.needsUpdate = true;

			}

			function setwrapT( value ) {

				circleTexture.wrapT = value;
				circleTexture.needsUpdate = true;

			}


		</script>
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