Remove mipmaps serialization

src/loaders/ObjectLoader.js

@@ -570,7 +570,6 @@ Object.assign( ObjectLoader.prototype, {
 				if ( data.minFilter !== undefined ) texture.minFilter = parseConstant( data.minFilter, TEXTURE_FILTER );
 				if ( data.magFilter !== undefined ) texture.magFilter = parseConstant( data.magFilter, TEXTURE_FILTER );
 				if ( data.anisotropy !== undefined ) texture.anisotropy = data.anisotropy;
-				if ( data.mipmaps !== undefined ) texture.mipmaps = data.mipmaps;
 
 				if ( data.flipY !== undefined ) texture.flipY = data.flipY;
 

src/textures/Texture.js

@@ -197,7 +197,6 @@ Texture.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {
 			minFilter: this.minFilter,
 			magFilter: this.magFilter,
 			anisotropy: this.anisotropy,
-			mipmaps: this.mipmaps.slice(),
 
 			flipY: this.flipY,