Hello Peter,
Using autocomplete functionality in Console pane (Ctrl+Space) you can find the description of each Python function:
exportModelTiles(path, [pixel_size], tile_size=256)
Export tiled model for the chunk.
:arg path: Path to output model.
:type path: string
:arg pixel_size: Target model resolution in meters.
:type pixel_size: float
:arg tile_size: Size of tiles in pixels.
:type tile_size: int
:return: Success of operation.
:rtype: boolean
For tiled model the surface is generated in Arbitrary mode with Generic texture mapping mode.