Cloud.js

/**
 * @author mattatz / http://github.com/mattatz
 *
 * Ray tracing based cloud noise object.
 */

THREE.Cloud = function ( color ) {

	var cloudMaterial = new THREE.ShaderMaterial( {
        defines         : THREE.CloudShader.defines,
        uniforms        : THREE.UniformsUtils.clone( THREE.CloudShader.uniforms ),
        vertexShader    : THREE.CloudShader.vertexShader,
        fragmentShader  : THREE.CloudShader.fragmentShader,
		transparent     : true,
		depthWrite      : false,
        depthTest       : false
	} );

    // initialize uniforms 
    
    cloudMaterial.uniforms.color.value = color || new THREE.Color( 0xeeeeee );
    cloudMaterial.uniforms.invModelMatrix.value = new THREE.Matrix4();
    cloudMaterial.uniforms.scale.value = new THREE.Vector3( 1, 1, 1 );
    cloudMaterial.uniforms.seed.value = Math.random() * 19.19;

	THREE.Mesh.call( this, new THREE.BoxGeometry( 1, 1, 1 ), cloudMaterial );

};

THREE.Cloud.prototype = Object.create( THREE.Mesh.prototype );
THREE.Cloud.prototype.constructor = THREE.Cloud;

THREE.Cloud.prototype.update = function ( time ) {

    var invModelMatrix = this.material.uniforms.invModelMatrix.value;

    this.updateMatrix();
    invModelMatrix.getInverse( this.matrix );

    if( time !== undefined ) {
        this.material.uniforms.time.value = time;
    }

    this.material.uniforms.invModelMatrix.value = invModelMatrix;
    this.material.uniforms.scale.value = this.scale;

};