/**
 * @param  {Array<THREE.Material>|THREE.Material} material
 * @return {Array<THREE.Material>}
 */
declare function ensureMaterialArray(material: any): any;
/**
 * @param  {THREE.Object3D} mesh
 * @param  {Array<string>} materialNames
 * @param  {THREE.Texture} envMap
 * @param  {number} reflectivity  [description]
 */
declare function applyEnvMap(mesh: any, materialNames: any, envMap: any, reflectivity: any): void;
