philjord wrote

Yes there is default back face culling.

This can be controlled by the PolygonAttributes that can be set on any Appearance applied to Shape3D

     * The default values are as follows:
     * cull face : CULL_BACK
     * back face normal flip : false
     * polygon mode : POLYGON_FILL
     * polygon offset : 0.0
     * polygon offset factor : 0.0

cullFace polygon culling mode; one of CULL_NONE, CULL_BACK, or CULL_FRONT

CULL_FRONT is fairly unused, but CULL_NONE is very handy for 2D particle sprites that aren't view oriented