Optionalmimetype?: stringUse mimetype to determine the format of the imported model, rather than
inferring it.
Optionaltolerance?: numberWhen an imported model is not manifold, try closing gaps smaller than tolerance in an effort to make it manifold.
Import a model, and convert it to a Manifold object for manipulation.
The original imported model may consist of an entire tree of nodes, each of which may or may not be manifold. This method will convert each child node, and then union the results together. If a child node has no mesh, the mesh has no geometry, or the mesh is not manifold, that child node will be silently excluded.