MicroStation CONNECT Edition Help

Modify Surfaces Toolbox

The tools in the Modify Surfaces toolbox are used to create new surfaces from the union, intersection, or difference between surfaces; to trim, extend, stitch, split, punch, or extrude surfaces; or to change B-spline specific attributes.

All tools in a toolbox are not always visible by default. To see all tools, right-click in the toolbox and select Show All from the menu.

To Select in the Modify Surfaces toolbox
Trim two elements to their common intersection.

Trim Surfaces
Punch a hole in a surface, or to project a B-spline curve onto a surface.

Trim Surfaces by Curves
Construct a fillet of constant radius between two surfaces.

Fillet Surfaces
Construct a blend surface between two B-spline surfaces along their rail curves.

Fillet Surface along Curves
Construct a blend surface from two surfaces.

Blend Surfaces
Construct a B-spline surface extension to an element.

Extend Surface
Construct a B-spline surface that is offset from another surface.

Offset Surface
Merge a surface to the edge of a second surface.

Merge Surface to Edge
To stitch two surfaces together to form a single surface.

Stitch Surfaces
Used to combine two or more B-spline surfaces that share common edges.
Combine Surfaces
(3D only) Used to perform a partial delete on a surface or solid (shape, cone, sphere, extruded surface, surface of revolution, or B-spline surface) along its rule lines, in the U or V direction.
Split Surface
Used to modify the shape of a surface by manipulating handles.
Surface Handlebar
Used to twist a B-spline surface, or a mesh element, about a defined axis.
Twist Surface
Reverse the sense of the boundaries of a B-spline surface.


Remove one or all boundaries (holes) from a B-spline surface.

Untrim Surface
Used to show or hide the control polygon, or to edit the number of control points and/or the number of rule lines for a B-spline surface.
Edit Surface Control Points