css3d.renderer.js

/**
 * Based on http://www.emagix.net/academic/mscs-project/item/camera-sync-with-css3-and-webgl-threejs
 * @author mrdoob / http://mrdoob.com/
 */

THREE.CSS3DObject = function ( element ) {

  THREE.Object3D.call( this );

  this.element = element;
  this.element.style.position = "absolute";
  this.element.style.WebkitTransformStyle = 'preserve-3d';
  this.element.style.MozTransformStyle = 'preserve-3d';
  this.element.style.oTransformStyle = 'preserve-3d';
  this.element.style.transformStyle = 'preserve-3d';

};

THREE.CSS3DObject.prototype = Object.create( THREE.Object3D.prototype );

THREE.CSS3DSprite = function ( element ) {

  THREE.CSS3DObject.call( this, element );

};

THREE.CSS3DSprite.prototype = Object.create( THREE.CSS3DObject.prototype );

//

THREE.CSS3DRenderer = function () {

  console.log( 'THREE.CSS3DRenderer', THREE.REVISION );

  var _width, _height;
  var _widthHalf, _heightHalf;
  var _projector = new THREE.Projector();

  var _tmpMatrix = new THREE.Matrix4();

  this.domElement = document.createElement( 'div' );

  this.domElement.style.overflow = 'hidden';

  this.domElement.style.WebkitTransformStyle = 'preserve-3d';
  this.domElement.style.WebkitPerspectiveOrigin = '50% 50%';

  this.domElement.style.MozTransformStyle = 'preserve-3d';
  this.domElement.style.MozPerspectiveOrigin = '50% 50%';

  this.domElement.style.oTransformStyle = 'preserve-3d';
  this.domElement.style.oPerspectiveOrigin = '50% 50%';

  this.domElement.style.transformStyle = 'preserve-3d';
  this.domElement.style.perspectiveOrigin = '50% 50%';

  // TODO: Shouldn't it be possible to remove cameraElement?

  this.cameraElement = document.createElement( 'div' );

  this.cameraElement.style.WebkitTransformStyle = 'preserve-3d';
  this.cameraElement.style.MozTransformStyle = 'preserve-3d';
  this.cameraElement.style.oTransformStyle = 'preserve-3d';
  this.cameraElement.style.transformStyle = 'preserve-3d';

  this.domElement.appendChild( this.cameraElement );

  this.setSize = function ( width, height ) {

    _width = width;
    _height = height;

    _widthHalf = _width / 2;
    _heightHalf = _height / 2;

    this.domElement.style.width = width + 'px';
    this.domElement.style.height = height + 'px';

    this.cameraElement.style.width = width + 'px';
    this.cameraElement.style.height = height + 'px';

  };

  var epsilon = function ( value ) {

    return Math.abs( value ) < 0.000001 ? 0 : value;

        };

  var getCameraCSSMatrix = function ( matrix ) {

    var elements = matrix.elements;

    return 'matrix3d(' +
      epsilon( elements[ 0 ] ) + ',' +
      epsilon( - elements[ 1 ] ) + ',' +
      epsilon( elements[ 2 ] ) + ',' +
      epsilon( elements[ 3 ] ) + ',' +
      epsilon( elements[ 4 ] ) + ',' +
      epsilon( - elements[ 5 ] ) + ',' +
      epsilon( elements[ 6 ] ) + ',' +
      epsilon( elements[ 7 ] ) + ',' +
      epsilon( elements[ 8 ] ) + ',' +
      epsilon( - elements[ 9 ] ) + ',' +
      epsilon( elements[ 10 ] ) + ',' +
      epsilon( elements[ 11 ] ) + ',' +
      epsilon( elements[ 12 ] ) + ',' +
      epsilon( - elements[ 13 ] ) + ',' +
      epsilon( elements[ 14 ] ) + ',' +
      epsilon( elements[ 15 ] ) +
    ')';

  }

  var getObjectCSSMatrix = function ( matrix ) {

    var elements = matrix.elements;

    return 'translate3d(-50%,-50%,0) matrix3d(' +
      epsilon( elements[ 0 ] ) + ',' +
      epsilon( elements[ 1 ] ) + ',' +
      epsilon( elements[ 2 ] ) + ',' +
      epsilon( elements[ 3 ] ) + ',' +
      epsilon( - elements[ 4 ] ) + ',' +
      epsilon( - elements[ 5 ] ) + ',' +
      epsilon( - elements[ 6 ] ) + ',' +
      epsilon( - elements[ 7 ] ) + ',' +
      epsilon( elements[ 8 ] ) + ',' +
      epsilon( elements[ 9 ] ) + ',' +
      epsilon( elements[ 10 ] ) + ',' +
      epsilon( elements[ 11 ] ) + ',' +
      epsilon( elements[ 12 ] ) + ',' +
      epsilon( elements[ 13 ] ) + ',' +
      epsilon( elements[ 14 ] ) + ',' +
      epsilon( elements[ 15 ] ) +
    ')';

  }

  this.render = function ( scene, camera ) {

    var fov = 0.5 / Math.tan( THREE.Math.degToRad( camera.fov * 0.5 ) ) * _height;

    this.domElement.style.WebkitPerspective = fov + "px";
    this.domElement.style.MozPerspective = fov + "px";
    this.domElement.style.oPerspective = fov + "px";
    this.domElement.style.perspective = fov + "px";

    var objects = _projector.projectScene( scene, camera, false ).objects;

    var style = "translate3d(0,0," + fov + "px)" + getCameraCSSMatrix( camera.matrixWorldInverse ) + " translate3d(" + _widthHalf + "px," + _heightHalf + "px, 0)";

    this.cameraElement.style.WebkitTransform = style;
    this.cameraElement.style.MozTransform = style;
    this.cameraElement.style.oTransform = style;
    this.cameraElement.style.transform = style;

    for ( var i = 0, il = objects.length; i < il; i ++ ) {

      var object = objects[ i ].object;

      if ( object instanceof THREE.CSS3DObject ) {

        var element = object.element;

        if ( object instanceof THREE.CSS3DSprite ) {

          // http://swiftcoder.wordpress.com/2008/11/25/constructing-a-billboard-matrix/

          _tmpMatrix.copy( camera.matrixWorldInverse );
          _tmpMatrix.transpose();
          _tmpMatrix.copyPosition( object.matrixWorld );
          _tmpMatrix.scale( object.scale );

          _tmpMatrix.elements[ 3 ] = 0;
          _tmpMatrix.elements[ 7 ] = 0;
          _tmpMatrix.elements[ 11 ] = 0;
          _tmpMatrix.elements[ 15 ] = 1;

          style = getObjectCSSMatrix( _tmpMatrix );

        } else {

          style = getObjectCSSMatrix( object.matrixWorld );

        }

        /*
        element.style.WebkitBackfaceVisibility = 'hidden';
        element.style.MozBackfaceVisibility = 'hidden';
        element.style.oBackfaceVisibility = 'hidden';
        element.style.backfaceVisibility = 'hidden';
        */

        element.style.WebkitTransform = style;
        element.style.MozTransform = style;
        element.style.oTransform = style;
        element.style.transform = style;

        if ( element.parentNode !== this.cameraElement ) {

          this.cameraElement.appendChild( element );

        }

      }

    }

  };

};