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Canvas3DRenderer.js
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Canvas3DRenderer.js
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/**
* Based on http://www.emagix.net/academic/mscs-project/item/camera-sync-with-css3-and-webgl-threejs
* @author mrdoob / http://mrdoob.com/
* @author yomotsu / https://yomotsu.net/
*/
THREE.CSS3DObject = function ( element ) {
THREE.Object3D.call( this );
this.element = element;
this.element.style.position = 'absolute';
this.addEventListener( 'removed', function () {
if ( this.element.parentNode !== null ) {
this.element.parentNode.removeChild( this.element );
}
} );
};
THREE.CSS3DObject.prototype = Object.create( THREE.Object3D.prototype );
THREE.CSS3DObject.prototype.constructor = THREE.CSS3DObject;
THREE.CSS3DSprite = function ( element ) {
THREE.CSS3DObject.call( this, element );
};
THREE.CSS3DSprite.prototype = Object.create( THREE.CSS3DObject.prototype );
THREE.CSS3DSprite.prototype.constructor = THREE.CSS3DSprite;
//
THREE.CSS3DRenderer = function () {
console.log( 'THREE.CSS3DRenderer', THREE.REVISION );
var _width, _height;
var _widthHalf, _heightHalf;
var matrix = new THREE.Matrix4();
var cache = {
camera: { fov: 0, style: '' },
objects: new WeakMap()
};
var domElement = document.createElement( 'div' );
domElement.style.overflow = 'hidden';
this.domElement = domElement;
var cameraElement = document.createElement( 'div' );
cameraElement.style.WebkitTransformStyle = 'preserve-3d';
cameraElement.style.transformStyle = 'preserve-3d';
domElement.appendChild( cameraElement );
var isIE = /Trident/i.test( navigator.userAgent );
this.getSize = function () {
return {
width: _width,
height: _height
};
};
this.setSize = function ( width, height ) {
_width = width;
_height = height;
_widthHalf = _width / 2;
_heightHalf = _height / 2;
domElement.style.width = width + 'px';
domElement.style.height = height + 'px';
cameraElement.style.width = width + 'px';
cameraElement.style.height = height + 'px';
};
function epsilon( value ) {
return Math.abs( value ) < 1e-10 ? 0 : value;
}
function getCameraCSSMatrix( 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 ] ) +
')';
}
function getObjectCSSMatrix( matrix, cameraCSSMatrix ) {
var elements = matrix.elements;
var matrix3d = '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 ] ) +
')';
if ( isIE ) {
return 'translate(-50%,-50%)' +
'translate(' + _widthHalf + 'px,' + _heightHalf + 'px)' +
cameraCSSMatrix +
matrix3d;
}
return 'translate(-50%,-50%)' + matrix3d;
}
function renderObject( object, camera, cameraCSSMatrix ) {
if ( object instanceof THREE.CSS3DObject ) {
var style;
if ( object instanceof THREE.CSS3DSprite ) {
// http://swiftcoder.wordpress.com/2008/11/25/constructing-a-billboard-matrix/
matrix.copy( camera.matrixWorldInverse );
matrix.transpose();
matrix.copyPosition( object.matrixWorld );
matrix.scale( object.scale );
matrix.elements[ 3 ] = 0;
matrix.elements[ 7 ] = 0;
matrix.elements[ 11 ] = 0;
matrix.elements[ 15 ] = 1;
style = getObjectCSSMatrix( matrix, cameraCSSMatrix );
} else {
style = getObjectCSSMatrix( object.matrixWorld, cameraCSSMatrix );
}
var element = object.element;
var cachedObject = cache.objects.get( object );
if ( cachedObject === undefined || cachedObject.style !== style ) {
element.style.WebkitTransform = style;
element.style.transform = style;
var objectData = { style: style };
if ( isIE ) {
objectData.distanceToCameraSquared = getDistanceToSquared( camera, object );
}
cache.objects.set( object, objectData );
}
if ( element.parentNode !== cameraElement ) {
cameraElement.appendChild( element );
}
}
for ( var i = 0, l = object.children.length; i < l; i ++ ) {
renderObject( object.children[ i ], camera, cameraCSSMatrix );
}
}
var getDistanceToSquared = function () {
var a = new THREE.Vector3();
var b = new THREE.Vector3();
return function ( object1, object2 ) {
a.setFromMatrixPosition( object1.matrixWorld );
b.setFromMatrixPosition( object2.matrixWorld );
return a.distanceToSquared( b );
};
}();
function filterAndFlatten( scene ) {
var result = [];
scene.traverse( function ( object ) {
if ( object instanceof THREE.CSS3DObject ) result.push( object );
} );
return result;
}
function zOrder( scene ) {
var sorted = filterAndFlatten( scene ).sort( function ( a, b ) {
var distanceA = cache.objects.get( a ).distanceToCameraSquared;
var distanceB = cache.objects.get( b ).distanceToCameraSquared;
return distanceA - distanceB;
} );
var zMax = sorted.length;
for ( var i = 0, l = sorted.length; i < l; i ++ ) {
sorted[ i ].element.style.zIndex = zMax - i;
}
}
this.render = function ( scene, camera ) {
var fov = camera.projectionMatrix.elements[ 5 ] * _heightHalf;
if ( cache.camera.fov !== fov ) {
if ( camera.isPerspectiveCamera ) {
domElement.style.WebkitPerspective = fov + 'px';
domElement.style.perspective = fov + 'px';
}
cache.camera.fov = fov;
}
scene.updateMatrixWorld();
if ( camera.parent === null ) camera.updateMatrixWorld();
if ( camera.isOrthographicCamera ) {
var tx = - ( camera.right + camera.left ) / 2;
var ty = ( camera.top + camera.bottom ) / 2;
}
var cameraCSSMatrix = camera.isOrthographicCamera ?
'scale(' + fov + ')' + 'translate(' + epsilon( tx ) + 'px,' + epsilon( ty ) + 'px)' + getCameraCSSMatrix( camera.matrixWorldInverse ) :
'translateZ(' + fov + 'px)' + getCameraCSSMatrix( camera.matrixWorldInverse );
var style = cameraCSSMatrix +
'translate(' + _widthHalf + 'px,' + _heightHalf + 'px)';
if ( cache.camera.style !== style && ! isIE ) {
cameraElement.style.WebkitTransform = style;
cameraElement.style.transform = style;
cache.camera.style = style;
}
renderObject( scene, camera, cameraCSSMatrix );
if ( isIE ) {
// IE10 and 11 does not support 'preserve-3d'.
// Thus, z-order in 3D will not work.
// We have to calc z-order manually and set CSS z-index for IE.
// FYI: z-index can't handle object intersection
zOrder( scene );
}
};
};

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