How can I put two different textures on the front and back of a plane?

Question

PRoblem: i'm trying to create (just for fun) a simple poker card (with a card back and a card front). I have two different images, for back and front. I easily created a Plane geometry with a single texture for both sides, but i really don't know how to assign a texture for a side and the other texture for the other side... i tried this (without success :( ):

var textureBack = new THREE.ImageUtils.loadTexture( 'images/cardBack.png' );
var textureFront = new THREE.ImageUtils.loadTexture( 'images/cardFront.png' );      

var material1 = new THREE.MeshBasicMaterial( { map: textureBack } );
var material2 = new THREE.MeshBasicMaterial( { map: textureFront } );

var geometry = new THREE.PlaneGeometry( 90, 110, 1, 1 );            
geometry.faces[ 0 ].materials.push( material1 );
geometry.faces[ 1 ].materials.push( material2 );

var card = new THREE.Mesh( geometry, new THREE.MeshFaceMaterial());

any help, please? :)

Answer 1

You need to place two plane geometries back-to-back.

First, create a geometry for the front.

var geometry1 = new THREE.PlaneGeometry( 90, 110, 1, 1 );

Now create another geometry for the back.

var geometry2 = new THREE.PlaneGeometry( 90, 110, 1, 1 );

Spin it 180 degrees.

geometry2.applyMatrix( new THREE.Matrix4().makeRotationY( Math.PI ) );

After you load the materials, create the meshes, and add them as children of a "card" object.

// textures
var textureFront = new THREE.ImageUtils.loadTexture('images/cardFront.png' );      
var textureBack = new THREE.ImageUtils.loadTexture('images/cardBack.png' );

// material
var material1 = new THREE.MeshBasicMaterial( { color: 0xffffff, map: textureFront } );
var material2 = new THREE.MeshBasicMaterial( { color: 0xffffff, map: textureBack } );

// card
card = new THREE.Object3D();
scene.add( card );

// mesh
mesh1 = new THREE.Mesh( geometry1, material1 );
card.add( mesh1 );
mesh2 = new THREE.Mesh( geometry2, material2 );
card.add( mesh2 );

You'll have an easier time with this if you use WebGLRenderer.

Fiddle: http://jsfiddle.net/mdAb7/11/

Updated to three.js r.69