TYPE: SOP
TITLE: Round SOP

The Round operation generates round fillets of a specified radius between two
surfaces.  It can also be used to round closed surfaces, as it will
generate spherical patches to fill in the corners.

Each surface in group one is compared with each surface in group 2.
If they come within the specified radius of each other, a rounded
fillet is generated between them.  The direction of the fillet is
determined by the normal of the surfaces, modified by the Flip Fillet
Direction toggles.  For best results, ensure that the normals of
all surfaces face outward from the center of the object being
rounded.  Note that self-fillets are not performed, even if a
surface is in both group one and two.

Parameters:

    Round group 1      - Subset of NURBS and Bezier surfaces
    Round group 2      - Subset of NURBS and Bezier surfaces
    3D Tolerance       - World space precision of fillet               /tol3d
    2D Tolerance       - Domain space precision of fillet              /tol2d
    Marching Steps     - Number of steps for tracing each profile span  /step
    Radius             - Radius of the fillet                         /radius
    Span Density       - Density to build fillet. Higher densities will provide
                         a more accurate rounded fillet at the expense of more 
                         geometry.  The actual number of isoparms in the fillet 
                         is a function of this, the radius, and the length of 
                         the fillet.                                   /spans
    Flip Left Fillet Direction - Logically flip normals of left
                         surfaces                                  /flipnorma
    Flip Right Fillet Direction - Logically flip normals of right
                         surfaces                                  /flipnormb
    Trim Primitives    - Try to cut surfaces back to the fillet    /trimedges
    Cusp Angle         - Angle at which a sharp corner is made         /angle

See also: Surfsect, Fillet, Bridge
