function Material(options){
    var name = '';
    options = options || {};

    // Backwards compatibility fix
    if(typeof(options) === 'string'){
        name = options;
        options = {};
    } else if(typeof(options) === 'object') {
        name = '';
    }

    /**
     * @property name
     * @type {String}
     */
    this.name = name;

    /**
     * material id.
     * @property id
     * @type {number}
     */
    this.id = Material.idCounter++;

    /**
     * Friction for this material. If non-negative, it will be used instead of the friction given by ContactMaterials. If there's no matching ContactMaterial, the value from .defaultContactMaterial in the World will be used.
     * @property {number} friction
     */
    this.friction = typeof(options.friction) !== 'undefined' ? options.friction : -1;

    /**
     * Restitution for this material. If non-negative, it will be used instead of the restitution given by ContactMaterials. If there's no matching ContactMaterial, the value from .defaultContactMaterial in the World will be used.
     * @property {number} restitution
     */
    this.restitution = typeof(options.restitution) !== 'undefined' ? options.restitution : -1;
}
Defines a physics material.
@class Material
@constructor
@param {object} [options]
@author schteppe