[Home](./index.md) > [three-loader-3dtiles](./three-loader-3dtiles.md) > [LoaderProps](./three-loader-3dtiles.loaderprops.md) > [onProgress](./three-loader-3dtiles.loaderprops.onprogress.md) ## LoaderProps.onProgress() method a loading progress callback function Signature: ```typescript onProgress?(progress: number | ProgressEvent, total?: number): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | progress | number \| ProgressEvent<EventTarget> | | | total | number | | Returns: void