The From CAD option provides a means to construct features of any type directly from CAD by selecting a CAD face and operates independently from the settings under the CAD Nominal control for type specific feature construction.
The 3D Geometry selection is a bit of a misnomer. It offers the ability to directly select a CAD face and build the underlying feature type from it. This can be used for any feature type that can be built directly from a single CAD face and includes:
Planes
Cylinders
Sphere's
Cone's
Parabola extraction from CAD is not currently supported.
The 2D Geometry option provides the ability to identify intersection and edge geometry such as circles. This is performed by either selecting a cylindrical face directly, in which case the circle closest to the click point of the cylinder will be extracted, or by fitting the contour points detected from a hole within a CAD face. By hovering over a planar surface with a hole, for example, the edge of the hole should be detected and highlighted. By then clicking to select this feature SA will extract the contour and fit a circle to the curve, verifying that it is indeed a circle.
2D Geometry extraction from CAD is currently supported for:
Circles
Rounded Slots
Square or Rectangular Slots