OptionalapplyMap the mesh through scene.matrix4(mesh) (placement and origin) before
writing, so the file holds world coordinates. Defaults to true; pass
false for the local render coordinates in views(mesh).positions().
Normals follow through the inverse-transpose rotation.
OptionalbinaryWrite binary little-endian PLY (binary_little_endian 1.0). Defaults to
true; false writes ASCII (ascii) PLY.
Options of exportPLY.