Optional ReadonlymaxMost triangles in one merged mesh; a group that would pass it is split. Default (and at most) the layout's limit, 2^28 - 1.
Optional ReadonlytriangleThe format of the scene the plan is for. 'indexed' also closes a group
at MAX_MERGED_SOURCES sources (an indexed scene names a merged
triangle's source by a 16-bit slot). Default 'records': no source cap,
the grouping it always had.
Options of mergeStaticGeometry.