// distance model
Object.assign(pc, {
/**
* @static
* @readOnly
* @name pc.DISTANCE_LINEAR
* @type String
* @description Linear distance model
*/
DISTANCE_LINEAR: 'linear',
/**
* @static
* @readonly
* @type String
* @name pc.DISTANCE_INVERSE
* @description Inverse distance model
*/
DISTANCE_INVERSE: 'inverse',
/**
* @static
* @readonly
* @type String
* @name pc.DISTANCE_EXPONENTIAL
* @description Exponential distance model
*/
DISTANCE_EXPONENTIAL: 'exponential'
});