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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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+ </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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+ <!--<script src="../build/three.min.js"></script>-->
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+ <script src="../build/three.js"></script>
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+ <script>
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+ CanvasTexture = function(parentTexture) {
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+ this._canvas = document.createElement("canvas");
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+ this._context2D = this._canvas.getContext("2d");
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+
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+ if (parentTexture) {
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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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+ 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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+ 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._rayonviseur = Math.ceil(Math.min(that._canvas.width, that._canvas.height / 30));
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+ that._exterieurCroix = Math.ceil(0.70710678 * that._rayonviseur);
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+ that._interieurCroix = Math.ceil(that._exterieurCroix / 10);
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+ that._epaisseurViseur = Math.ceil(that._exterieurCroix / 10);
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+
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+ that._draw();
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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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+ 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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+ _rayonviseur: 57,
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+ _exterieurCroix: 40,
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+ _interieurCroix: 4,
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+ _epaisseurViseur: 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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+ if (this._parentTexture.indexOf(parentTexture) === -1) {
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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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+ setCrossPosition: function (x, y) {
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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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+ _draw: function () {
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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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+ // White cross.
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+ this._context2D.lineWidth = this._epaisseurViseur * 3;
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+ this._context2D.strokeStyle = "#FFFFFF";
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+
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+ this._context2D.beginPath();
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+ this._context2D.moveTo(this._xCross - this._exterieurCroix - 2, this._yCross - this._exterieurCroix -2);
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+ this._context2D.lineTo(this._xCross - this._interieurCroix, this._yCross - this._interieurCroix);
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+
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+ this._context2D.moveTo(this._xCross + this._interieurCroix, this._yCross + this._interieurCroix);
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+ this._context2D.lineTo(this._xCross + this._exterieurCroix + 2, this._yCross + this._exterieurCroix + 2);
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+
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+ this._context2D.moveTo(this._xCross - this._exterieurCroix - 2, this._yCross + this._exterieurCroix + 2);
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+ this._context2D.lineTo(this._xCross - this._interieurCroix, this._yCross + this._interieurCroix);
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+
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+ this._context2D.moveTo(this._xCross + this._interieurCroix, this._yCross - this._interieurCroix);
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+ this._context2D.lineTo(this._xCross + this._exterieurCroix + 2, this._yCross - this._exterieurCroix - 2);
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+
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+ this._context2D.stroke();
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+
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+ // Black cross.
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+ this._context2D.lineWidth = this._epaisseurViseur;
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+ this._context2D.strokeStyle = "#000000";
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+
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+ this._context2D.beginPath();
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+ this._context2D.moveTo(this._xCross - this._exterieurCroix, this._yCross - this._exterieurCroix);
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+ this._context2D.lineTo(this._xCross - this._interieurCroix, this._yCross - this._interieurCroix);
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+
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+ this._context2D.moveTo(this._xCross + this._interieurCroix, this._yCross + this._interieurCroix);
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+ this._context2D.lineTo(this._xCross + this._exterieurCroix, this._yCross + this._exterieurCroix);
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+
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+ this._context2D.moveTo(this._xCross - this._exterieurCroix, this._yCross + this._exterieurCroix);
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+ this._context2D.lineTo(this._xCross - this._interieurCroix, this._yCross + this._interieurCroix);
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+
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+ this._context2D.moveTo(this._xCross + this._interieurCroix, this._yCross - this._interieurCroix);
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+ this._context2D.lineTo(this._xCross + this._exterieurCroix, this._yCross - this._exterieurCroix);
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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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+ //this._parentTexture[i].image = this._canvas;
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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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+ </script>
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+ <script>
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+
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+ var container = document.getElementById("container");
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+ var width = window.innerWidth;
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+ var height = window.innerHeight ;
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+ var objects = [];
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+
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+ var scene = new THREE.Scene();
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+ var 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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+ 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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+ var getMousePosition = function (dom, x, y) {
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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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+ var getIntersects = function (point, objects) {
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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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+ window.addEventListener('resize', function(evt) {
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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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+ }, false);
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+
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+ container.addEventListener('click', function(evt) {
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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) {
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+ if (intersects[0].uv) {
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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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+ }, false);
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+
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+
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+ var 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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+ var cubeTexture = new THREE.Texture(undefined, THREE.UVMapping, THREE.RepeatWrapping, THREE.RepeatWrapping);
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+ var 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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+ uvs = cubeGeometry.faceVertexUvs[0][i];
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+ for (var j = 0; j < 3; j++) {
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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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+ 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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+ var 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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+ for (var i = 0; i < uvs.length; i++) {
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+ //if (uvs[i] < 0.1) uvs[i] = -1;
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+ uvs[i] *= 2;
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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 left.
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+ var circleTexture = new THREE.Texture(undefined, THREE.UVMapping, THREE.RepeatWrapping, THREE.MirroredRepeatWrapping);
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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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+ for (var i = 0; i < uvs.length; i++) {
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+ uvs[i] *= 2;
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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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+ render();
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+
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+ function render() {
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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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+ </script>
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+ </body>
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+</html>
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rfm1201