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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <title>three.js ray cast - texture - canvas</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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+ <style>
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+ body {
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+ color: #808080;
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+ font-family:Monospace;
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+ font-size:13px;
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+ text-align:center;
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+
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+ background-color: #ffffff;
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+ margin: 0px;
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+ overflow: hidden;
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+ }
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+
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+ #info {
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+ position: absolute;
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+ top: 0px; width: 100%;
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+ padding: 5px;
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+ }
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+
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+ #controls {
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+ position: absolute;
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+ text-align:left;
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+ top: 40px;
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+ left: 5px;
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+ padding: 5px;
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+ }
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+
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+ .control {
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+ margin-bottom: 3px;
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+ }
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+
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+ input {
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+ width: 50px;
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+ }
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+ </style>
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+ </head>
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+ <body>
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+ <div id="container"></div>
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+ <div id="info"><a href="http://threejs.org" target="_blank">three.js</a> - texture intersection<br>Left to right: buffer geometry - geometry - indexed buffer geometry</div>
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+ <fieldset id="controls">
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+ <legend>Circle</legend>
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+ <div class="control">
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+ WrapS : <select onchange="setwrapS(this)">
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+ <option value="ClampToEdgeWrapping">ClampToEdgeWrapping</option>
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+ <option value="RepeatWrapping" selected>RepeatWrapping</option>
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+ <option value="MirroredRepeatWrapping">MirroredRepeatWrapping</option>
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+ </select>
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+ </div>
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+ <div class="control">
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+ WrapT : <select onchange="setwrapT(this)">
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+ <option value="ClampToEdgeWrapping">ClampToEdgeWrapping</option>
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+ <option value="RepeatWrapping" selected>RepeatWrapping</option>
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+ <option value="MirroredRepeatWrapping">MirroredRepeatWrapping</option>
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+ </select>
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+ </div>
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+ <div class="control">
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+ Offset : X <input type="number" value="0" step="0.05" onchange="setOffsetU(this)" />
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+ Y <input type="number" value="0" step="0.05" onchange="setOffsetV(this)" /><br />
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+ </div>
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+ <div class="control">
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+ Repeat : X <input type="number" value="1" step="0.1" onchange="setRepeatU(this)" />
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+ Y <input type="number" value="1" step="0.1" onchange="setRepeatV(this)" />
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+ </div>
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+ </fieldset>
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+ <script src="../build/three.min.js"></script>
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+ <script>
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+
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+ CanvasTexture = function ( parentTexture ) {
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+
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+ this._canvas = document.createElement( "canvas" );
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+ this._canvas.width = this._canvas.height = 1024;
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+ this._context2D = this._canvas.getContext( "2d" );
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+
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+ if ( parentTexture ) {
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+
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+ this._parentTexture.push( parentTexture );
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+ parentTexture.image = this._canvas;
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+
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+ }
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+
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+ var that = this;
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+ this._background = document.createElement( "img" );
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+ this._background.addEventListener( "load", function ( event ) {
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+
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+ that._canvas.width = that._background.naturalWidth;
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+ that._canvas.height = that._background.naturalHeight;
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+
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+ that._crossRadius = Math.ceil( Math.min( that._canvas.width, that._canvas.height / 30 ) );
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+ that._crossMax = Math.ceil( 0.70710678 * that._crossRadius );
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+ that._crossMin = Math.ceil( that._crossMax / 10 );
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+ that._crossThickness = Math.ceil( that._crossMax / 10 );
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+
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+ that._draw();
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+
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+ }, false );
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+ this._background.crossOrigin = '';
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+ this._background.src = "textures/UV_Grid_Sm.jpg";
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+
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+ this._draw();
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+
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+ }
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+
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+
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+ CanvasTexture.prototype = {
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+
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+ constructor: CanvasTexture,
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+
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+ _canvas: null,
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+ _context2D: null,
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+ _xCross: 0,
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+ _yCross: 0,
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+
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+ _crossRadius: 57,
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+ _crossMax: 40,
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+ _crossMin: 4,
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+ _crossThickness: 4,
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+
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+ _parentTexture: [],
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+
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+ addParent: function ( parentTexture ) {
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+
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+ if ( this._parentTexture.indexOf( parentTexture ) === - 1 ) {
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+
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+ this._parentTexture.push( parentTexture );
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+ parentTexture.image = this._canvas;
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+
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+ }
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+
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+ },
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+
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+ setCrossPosition: function ( x, y ) {
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+
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+ this._xCross = x * this._canvas.width;
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+ this._yCross = y * this._canvas.height;
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+
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+ this._draw();
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+
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+ },
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+
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+ _draw: function () {
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+
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+ if ( ! this._context2D ) return;
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+
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+ this._context2D.clearRect( 0, 0, this._canvas.width, this._canvas.height )
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+
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+ // Background.
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+ this._context2D.drawImage( this._background, 0, 0 );
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+
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+ // Yellow cross.
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+ this._context2D.lineWidth = this._crossThickness * 3;
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+ this._context2D.strokeStyle = "#FFFF00";
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+
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+ this._context2D.beginPath();
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+ this._context2D.moveTo( this._xCross - this._crossMax - 2, this._yCross - this._crossMax - 2 );
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+ this._context2D.lineTo( this._xCross - this._crossMin, this._yCross - this._crossMin );
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+
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+ this._context2D.moveTo( this._xCross + this._crossMin, this._yCross + this._crossMin );
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+ this._context2D.lineTo( this._xCross + this._crossMax + 2, this._yCross + this._crossMax + 2 );
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+
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+ this._context2D.moveTo( this._xCross - this._crossMax - 2, this._yCross + this._crossMax + 2 );
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+ this._context2D.lineTo( this._xCross - this._crossMin, this._yCross + this._crossMin );
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+
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+ this._context2D.moveTo( this._xCross + this._crossMin, this._yCross - this._crossMin );
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+ this._context2D.lineTo( this._xCross + this._crossMax + 2, this._yCross - this._crossMax - 2 );
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+
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+ this._context2D.stroke();
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+
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+ for ( var i = 0; i < this._parentTexture.length; i ++ ) {
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+
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+ this._parentTexture[ i ].needsUpdate = true;
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+
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+ }
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+
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+ }
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+
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+ }
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+
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+ </script>
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+ <script>
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+
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+ var width = window.innerWidth;
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+ var height = window.innerHeight;
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+
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+ var canvas;
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+ var objects = [];
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+ var planeTexture, cubeTexture, circleTexture;
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+
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+ var container;
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+
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+ var camera, scene, renderer;
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+
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+ var raycaster = new THREE.Raycaster();
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+ var mouse = new THREE.Vector2();
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+ var onClickPosition = new THREE.Vector2();
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+
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+ init();
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+ render();
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+
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+ function init() {
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+
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+ container = document.getElementById( "container" );
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+
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+ scene = new THREE.Scene();
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+
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+ camera = new THREE.PerspectiveCamera( 45, width / height, 1, 1000 );
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+ camera.position.x = - 30;
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+ camera.position.y = 40;
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+ camera.position.z = 50;
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+ camera.lookAt( scene.position );
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+
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+ renderer = new THREE.WebGLRenderer();
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+ renderer.setClearColor( new THREE.Color( 0xEEEEEE, 1.0 ) );
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+ renderer.setSize( width, height );
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+ container.appendChild( renderer.domElement );
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+
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+ // A cube, in the middle.
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+ cubeTexture = new THREE.Texture( undefined, THREE.UVMapping, THREE.RepeatWrapping, THREE.RepeatWrapping );
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+ canvas = new CanvasTexture( cubeTexture );
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+ var cubeMaterial = new THREE.MeshBasicMaterial( { map: cubeTexture } );
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+ var cubeGeometry = new THREE.BoxGeometry( 20, 20, 20 );
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+ // Set a specific texture mapping.
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+ var uvs;
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+ for ( var i = 0; i < cubeGeometry.faceVertexUvs[ 0 ].length; i ++ ) {
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+
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+ uvs = cubeGeometry.faceVertexUvs[ 0 ][ i ];
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+ for ( var j = 0; j < 3; j ++ ) {
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+
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+ if ( uvs[ j ].x < 0.1 ) uvs[ j ].x = - 1;
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+ if ( uvs[ j ].y < 0.1 ) uvs[ j ].y = - 1;
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+
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+ }
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+
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+ }
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+ var cube = new THREE.Mesh( cubeGeometry, cubeMaterial );
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+ cube.position.x = 4;
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+ cube.position.y = - 5;
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+ cube.position.z = 0;
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+ objects.push( cube );
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+ scene.add( cube );
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+
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+ // A plane on the left.
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+ planeTexture = new THREE.Texture( undefined, THREE.UVMapping, THREE.MirroredRepeatWrapping, THREE.MirroredRepeatWrapping );
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+ canvas.addParent( planeTexture );
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+ var planeMaterial = new THREE.MeshBasicMaterial( { map: planeTexture } );
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+ var planeGeometry = new THREE.PlaneBufferGeometry( 25, 25, 1, 1 );
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+ var uvs = planeGeometry.attributes.uv.array;
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+ // Set a specific texture mapping.
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+ for ( var i = 0; i < uvs.length; i ++ ) {
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+
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+ uvs[ i ] *= 2;
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+
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+ }
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+ var plane = new THREE.Mesh( planeGeometry, planeMaterial );
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+ plane.position.x = - 16;
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+ plane.position.y = - 5;
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+ plane.position.z = 0;
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+ objects.push( plane );
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+ scene.add( plane );
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+
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+ // A circle on the right.
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+ circleTexture = new THREE.Texture( undefined, THREE.UVMapping, THREE.RepeatWrapping, THREE.RepeatWrapping );
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+ canvas.addParent( circleTexture );
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+ var circleMaterial = new THREE.MeshBasicMaterial( { map: circleTexture } );
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+ var circleGeometry = new THREE.CircleBufferGeometry( 25, 40, 0, Math.PI * 2 );
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+ var uvs = circleGeometry.attributes.uv.array;
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+ // Set a specific texture mapping.
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+ for ( var i = 0; i < uvs.length; i ++ ) {
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+
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+ uvs[ i ] = ( uvs[ i ] - 0.25 ) * 2;
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+
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+ }
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+ var circle = new THREE.Mesh( circleGeometry, circleMaterial );
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+ circle.position.x = 24;
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+ circle.position.y = - 5;
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+ circle.position.z = 0;
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+ objects.push( circle );
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+ scene.add( circle );
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+ container.addEventListener( 'click', onClick, false );
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ };
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+
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+ function onClick( evt ) {
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+
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+ evt.preventDefault();
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+
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+ var array = getMousePosition( container, evt.clientX, evt.clientY );
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+ onClickPosition.fromArray( array );
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+
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+ var intersects = getIntersects( onClickPosition, objects );
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+ if ( intersects.length > 0 && intersects[ 0 ].uv ) {
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+
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+ var uv = intersects[ 0 ].uv;
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+ intersects[ 0 ].object.material.map.transformUv( uv );
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+ canvas.setCrossPosition( uv.x, uv.y );
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+
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+ }
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+
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+ };
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+
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+ var getMousePosition = function ( dom, x, y ) {
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+
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+ var rect = dom.getBoundingClientRect();
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+ return [ ( x - rect.left ) / rect.width, ( y - rect.top ) / rect.height ];
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+
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+ };
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+
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+ var getIntersects = function ( point, objects ) {
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+
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+ mouse.set( ( point.x * 2 ) - 1, - ( point.y * 2 ) + 1 );
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+
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+ raycaster.setFromCamera( mouse, camera );
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+
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+ return raycaster.intersectObjects( objects );
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+
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+ };
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+
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+ function render() {
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+
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+ requestAnimationFrame( render );
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+ renderer.render( scene, camera );
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+
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+ };
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+
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+ function setwrapS( that ) {
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+
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+ circleTexture.wrapS = THREE[ that.value ];
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+ circleTexture.needsUpdate = true;
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+
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+ };
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+
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+ function setwrapT( that ) {
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+
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+ circleTexture.wrapT = THREE[ that.value ];
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+ circleTexture.needsUpdate = true;
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+
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+ };
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+
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+ function setOffsetU( that ) {
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+
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+ circleTexture.offset.x = parseFloat( that.value );
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+
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+ };
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+
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+ function setOffsetV( that ) {
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+
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+ circleTexture.offset.y = parseFloat( that.value );
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+
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+ };
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+
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+ function setRepeatU( that ) {
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+
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+ circleTexture.repeat.x = parseFloat( that.value );
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+
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+ };
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+
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+ function setRepeatV( that ) {
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+
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+ circleTexture.repeat.y = parseFloat( that.value );
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+
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+ };
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+
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+ </script>
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+ </body>
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+</html>
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Mr.doob