Regarding CropN parameter in exporting mesh from MarchingCubes

Hi. Since I'm recently exploring if exporting mesh with lower resolution is possible, I'm wondering if there is any specific reason why the [CropN parameter](https://github.com/autonomousvision/sdfstudio/blob/master/nerfstudio/utils/marching_cubes.py#L32) is set to 512. If I change it to a lower value, would it affect the mesh result? Thank you! I appreciate it if any feedback is provided!