three.js/src/materials/Uniforms.js

/**
 * @author alteredq / http://alteredqualia.com/
 */
 
var Uniforms = {

	clone: function( uniforms_src ) {

		var u, p, parameter, parameter_src, uniforms_dst = {};

		for ( u in uniforms_src ) {

			uniforms_dst[ u ] = {};

			for ( p in uniforms_src[ u ] ) {

				parameter_src = uniforms_src[ u ][ p ];

				if ( parameter_src instanceof THREE.Color ||
					 parameter_src instanceof THREE.Vector3 ||
					 parameter_src instanceof THREE.Texture ) {

					uniforms_dst[ u ][ p ] = parameter_src.clone();

				} else {

					uniforms_dst[ u ][ p ] = parameter_src;

				}

			}

		}

		return uniforms_dst;

	},

	merge: function( uniforms ) {

		var u, p, tmp, merged = {};

		for( u = 0; u < uniforms.length; u++ ) {

			tmp = this.clone( uniforms[ u ] );

			for ( p in tmp ) {

				merged[ p ] = tmp[ p ];

			}

		}

		return merged;

	}

};