# Exporting In the `Export Codewalker XML > Fragment` panel, you will find the two options, depending of your edits done prior in Blender.

First option - `Auto Calculate Bonetags` in Drawable is doing a bone number calculations. This option is needed to use when you have added a fresh new bone (i.e. a rear doors). The hardcoded bone tag value tells the game that specific bone has to be treated as rear doors. If you have not added any bones, do not select this. Second option - `Auto Calculate Inertia` and `Auto Calculate Volume` has to be ticked if you have changed the shape of any collision mesh. Using this option provides a correct calculation for a physics engine. If you have not changed any collision shapes, do not select this. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.sollumz.org/tutorials/creating-vehicles/exporting.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.