Subject:   -29- 1.2 Bug Billboard normals and intersections
Date: 8 Apr 1994 00:00:01 EST

  During rendering, pfBillboard normals are not affected by the
  transformation applied to make the geometry follow the eye.
  Intersection testing of line segments (pfSegsIsectNode) against the
  pfGeoSet's geometry and bounding box are not yet implemented; only
  the bounding sphere of the entire pfBillboard is available.