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POthree.js - Backside texture of cube is flipped vertically
 

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  1. POthree.js - Backside texture of cube is flipped vertically
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    <p>I am currently trying to make a rotating cube with textures. I also want the cube to rotate on it's x- and y-axis (back and forth) by using controls (arrow images which rotate the cube on mouseover). When rotating it on the x-axis the back side of the cube is upside down.</p> <p>I know that this has to do with the way UV mapping works. So I tried to correct that on cube initialization, which worked fine. But when I try to rotate the cube on it's y-axis, the texture is upside down again. So I learned that I have to change the texture orientation on the fly - according to the rotation request.</p> <p>But this doesn't work for me. I found no way to change "faceVertexUvs[0][5]" after the cube is initialized. Trying to set "needsUpdate" for the cube geometry on initialization didn't help.</p> <p>Hope I made myself clear. Is there some sort of solution to that problem?</p> <p>Thanks in advance Michael</p> <p>To illustrate my problem better: I post my source code here.</p> <p>It cannot be demonstrated in JsFiddle as using texture images from another domain is not allowed (and CORS didn't work). Just copy-paste the following code and save it as "test.html" locally. A texture image is availabe here: <a href="http://www.mikelmade.de/cors/t.png" rel="nofollow">http://www.mikelmade.de/cors/t.png</a>. It should be in the same directory as "test.html". Open "test.html" in a WebGL-capable browser, then pass the mouse over "up" and you should see what I mean.</p> <pre><code>&lt;html&gt;&lt;head&gt;&lt;script src="jquery.js"&gt;&lt;/script&gt;&lt;/head&gt;&lt;body&gt; &lt;script src="https://raw.github.com/mrdoob/three.js/master/build/three.min.js"&gt;&lt;/script&gt; &lt;script src="https://raw.github.com/mrdoob/three.js/master/examples/js/libs/stats.min.js"&gt; &lt;/script&gt; &lt;script&gt; var cubeGeo; var materials = []; var container, stats; var camera, scene, renderer; var cube, plane; var targetRotation = 0; var targetRotationOnMouseDown = 0; var mouseX = 0; var mouseXOnMouseDown = 0; var windowHalfX = window.innerWidth / 2; var windowHalfY = window.innerHeight / 2; init(); animate(); function init() { container = document.createElement( 'div' ); document.body.appendChild( container ); var info = document.createElement( 'div' ); info.style.position = 'absolute'; info.style.top = '10px'; info.style.width = '100%'; info.style.textAlign = 'center'; info.innerHTML = 'Drag to spin the cube'; container.appendChild( info ); camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 1000 ); camera.position.y = 150; camera.position.z = 500; scene = new THREE.Scene(); // add subtle ambient lighting var ambientLight = new THREE.AmbientLight(0x555555); scene.add(ambientLight); // add directional light source var directionalLight = new THREE.DirectionalLight(0xEEEEEE); directionalLight.position.set(1, 1, 1).normalize(); scene.add(directionalLight); // Cube for ( var i = 0; i &lt; 6; i ++ ) { var img = new Image(); img.src = 't.png'; var tex = new THREE.Texture(img); img.tex = tex; img.onload = function() { this.tex.needsUpdate = true; }; var mat = new THREE.MeshLambertMaterial({map: tex}); materials.push(mat); } cubeGeo = new THREE.CubeGeometry(200,200,200,1,1,1); cubeGeo.uvsNeedUpdate = true; cubeGeo.dynamic = true; cube = new THREE.Mesh( cubeGeo, new THREE.MeshFaceMaterial( materials ) ); cube.position.y = 150; scene.add( cube ); renderer = new THREE.WebGLRenderer({antialias:true}); renderer.setSize( window.innerWidth, window.innerHeight ); // enable shadows on the renderer renderer.shadowMapEnabled = true; container.appendChild( renderer.domElement ); stats = new Stats(); stats.domElement.style.position = 'absolute'; stats.domElement.style.top = '0px'; container.appendChild( stats.domElement ); document.addEventListener( 'mousedown', onDocumentMouseDown, false ); document.addEventListener( 'touchstart', onDocumentTouchStart, false ); document.addEventListener( 'touchmove', onDocumentTouchMove, false ); window.addEventListener( 'resize', onWindowResize, false ); } function onWindowResize() { windowHalfX = window.innerWidth / 2; windowHalfY = window.innerHeight / 2; camera.aspect = window.innerWidth / window.innerHeight; camera.updateProjectionMatrix(); renderer.setSize( window.innerWidth, window.innerHeight ); } function onDocumentMouseDown( event ) { event.preventDefault(); document.addEventListener( 'mousemove', onDocumentMouseMove, false ); document.addEventListener( 'mouseup', onDocumentMouseUp, false ); document.addEventListener( 'mouseout', onDocumentMouseOut, false ); mouseXOnMouseDown = event.clientX - windowHalfX; targetRotationOnMouseDown = targetRotation; } function onDocumentMouseMove( event ) { mouseX = event.clientX - windowHalfX; targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02; } function onDocumentMouseUp( event ) { document.removeEventListener( 'mousemove', onDocumentMouseMove, false ); document.removeEventListener( 'mouseup', onDocumentMouseUp, false ); document.removeEventListener( 'mouseout', onDocumentMouseOut, false ); } function onDocumentMouseOut( event ) { document.removeEventListener( 'mousemove', onDocumentMouseMove, false ); document.removeEventListener( 'mouseup', onDocumentMouseUp, false ); document.removeEventListener( 'mouseout', onDocumentMouseOut, false ); } function onDocumentTouchStart( event ) { if ( event.touches.length === 1 ) { event.preventDefault(); mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX; targetRotationOnMouseDown = targetRotation; } } function onDocumentTouchMove( event ) { if ( event.touches.length === 1 ) { event.preventDefault(); mouseX = event.touches[ 0 ].pageX - windowHalfX; targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05; } } function animatex(dir) { cubeGeo.faceVertexUvs[0][5] = [new THREE.UV(1, 0), new THREE.UV(1, 1), new THREE.UV(0, 1), new THREE.UV(0, 0)]; animate2(dir); } var anim = 0; function animate2(dir) { requestAnimationFrame(function() { cubeGeo.faceVertexUvs[0][5] = [new THREE.UV(1, 0), new THREE.UV(1, 1), new THREE.UV(0, 1), new THREE.UV(0, 0)]; if(anim == 1) { animate2(dir); } }); render2(); stats.update(); } function render2() { cube.rotation.x = cube.rotation.x+0.06; renderer.render( scene, camera ); } function animate() { requestAnimationFrame( animate ); render(); stats.update(); } function render() { cube.rotation.y += ( targetRotation - cube.rotation.y ) * 0.05; $('#test').html(cube.rotation.y); renderer.render( scene, camera ); } &lt;/script&gt; &lt;div id="up" style="position:absolute;z-index:500000;left:100px;top:20px;" class="nav"&gt;up&lt;/div&gt; &lt;div id="down" style="position:absolute;z-index:500000;left:100px;top:40px;" class="nav"&gt;down&lt;/div&gt; &lt;div id="left" style="position:absolute;z-index:500000;left:100px;top:60px;" class="nav"&gt;left&lt;/div&gt; &lt;div id="right" style="position:absolute;z-index:500000;left:100px;top:80px;" class="nav"&gt;right&lt;/div&gt; &lt;div id="test" style="position:absolute;z-index:500000;left:100px;top:100px;"&gt; &lt;/div&gt; &lt;script&gt; var _interval = 0; $(document).ready(function(){ $('.nav').mouseover(function() { switch($(this).prop('id')) { case 'up': anim = 1; animatex('up'); break; } }); $('.nav').mouseout( function () { anim = 0; } ); }); &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. USMichael Perlbach
    1. USMichael Perlbach
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    1. COcould you add in soome code snippets or a jsfiddle link?
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      1. POthree.js - Backside texture of cube is flipped vertically
      1. USDaniel Robinson
 

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