The editing operations in this section break objects apart, cut holes in them, and put them back together. Some of these commands join curves to curves, or surfaces into polysurfaces, and break a composite curve or polysurface into its components.

The commands: Join , Explode , Trim and Split apply to curves, surfaces, and polysurfaces.

Join

The Join command connects curves or surfaces together into one object.

Join turns:

• Lines that touch end to end into polylines.
• Curves that touch end to end into polycurves.
• Surfaces and polysurfaces that touch on an edge into polysurfaces or solids.

When a curve is selected first, surface edges or mesh edges can be joined with the curve to create a polyline or polycurve.

Join Curves into a Polycurve:

1. Open Join-Curves.3dm in Rhino .

1. Window-select all the curves. The Command History displays 5 curves added to selection.
2. On the Edit menu, select Join . The Command History displays 5 curves joined into one closed curve.

The separate curves have been assembled into a single closed polycurve.

Join Surfaces into a Polysurface:

1. Open Join-Surfaces.3dm in Rhino .

1. Window-select both surfaces. The Command History displays 2 surfaces added to selection.
2. Run the Join command. The Command History displays 2 surfaces or polysurfaces joined into one open polysurface.

The separate surfaces have been assembled into an open polysurface.

Join Surfaces into a Solid Polysurface:

1. Open Join-Solid.3dm in Rhino .

1. Window-select both surfaces. The Command History displays 6 surfaces added to selection.
2. Run the Join command. The Command History displays 6 surfaces or polysurfaces joined into one closed polysurface.

The separate surfaces have been assembled into a closed polysurface (solid).

Explode

The Explode command removes the connection between joined curves and polysurfaces. Once exploded, you retrieve the individual components. Explode only works on any object that can be reduced to its component parts.

Explode a Polycurve into Individual Curves

1. Open Explode-Curves.3dm in Rhino .

1. Select the red curve. The Command History displays 1 curve added to selection.
2. On the Edit menu, select the Explode command. The Command History displays Exploded a curve into 5 segments.
3. Click and drag the curves apart.

The polycurve has been disassembled into its individual curve components.

Explode a Polysurface into Individual Surfaces

1. Open Explode-Polysurface.3dm in Rhino .

1. Select the polysurface. The Command History displays 1 polysurface added to selection.
2. Run Explode command. The Command History displays Exploded a polysurface into 3 surfaces.
3. Click and drag the surfaces apart.

The polysurface has been disassembled into its individual surface components.

Trim & Split

Trim and Split commands are similar. They both cut objects with other objects. When you trim an object, you select the parts to remove and they are deleted. When you split an object, no parts are deleted.

Trim

The Trim command cuts and deletes selected portions of an object at the intersection with another object used as a cutter.

Trim Curves

1. Open Trim-Curves.3dm in Rhino .

1. On the Edit menu, select the Trim command.
2. At the Select cutting objects prompt , select the blue curve and press Enter or right-click.
3. At the Select objects to trim prompt , select the right side of the red circle and the black rectangle. Press Enter .

The red and black curves have been cut and deleted at the intersection with the blue curve.

Trim Surfaces

1. Open Trim-Surfaces.3dm in Rhino .

1. Run the Trim command.
2. At the Select cutting objects prompt , select the red surface and press Enter .
3. At the Select objects to trim prompt , select the right side of the green sphere. Press Enter .

The sphere has been cut and deleted at the intersection with the red surface.

Split

The Split command divides objects into parts using other objects as cutters.

Split Curves

1. Open Split-Curves.3dm in Rhino .

1. On the Edit menu, select the Split command.
2. At the Select objects to split prompt , select the red circle and the black rectangle. Press Enter .
3. At the Select cutting objects prompt , select the blue curve. Press Enter when done.

The red and black curves have been divided in two at the intersection with the blue curve.

Split Surfaces

1. Open Split-Surfaces.3dm in Rhino .

1. On the Edit menu, select the Split command.
2. At the Select objects to split prompt , select the green sphere. Press Enter .
3. At the Select cutting objects prompt , select the red surface. Press Enter when done.

The green sphere has been divided in two at the intersection with the red surface.

Untrim

The Untrim command removes trims from a surface restoring the underlying untrimmed object.

Untrim Surfaces

1. Open Untrim-Surfaces.3dm in Rhino .

1. Select the green sphere.
2. Press F10 on your keyboard to turn Control Points on.

1. Run the Untrim command.
2. At the Select edge to untrim prompt , select the edge of the inner hole. The hole is removed.
3. At the Select edge to untrim prompt , select the boundary edge.

Rebuild

The Rebuild command reconstructs curves or surfaces to a certain number of Control Points and Degree.

Control Point editing is an important part of form finding. Moving control points around allows you to modify the shape of your product / project. Rebuild allows you to adjust the number of control points as needed.

Rebuild Curves

1. Open Rebuild-Curve.3dm in Rhino .
2. Select the black curve. Notice the control points at each end of the line.
3. Select one and drag it around. The line changes direction but stays a line.

1. Undo the changes.
2. Select the line again and run the Rebuild command.
3. In the Rebuild dialog box, set the: Point count to 3, Degree to 2, select Delete input. Press OK.
4. Select the black curve. You’ll notice 3 control points now.
5. Select the middle point and drag it. Notice how we’ve introduced a bend.

1. Rebuild it again. This time, set the: Point count to 4, Degree to 3, select Delete input. Press OK.

Rebuild Surfaces

Rebuild works for both curves and surfaces. Surfaces have two directions called U and V . This will be reflected in the Rebuild dialog box.

1. Open Rebuild-Surface.3dm in Rhino .
2. Select Select the black surface.
3. Press F10 on your keyboard or type the PointsOn command to activate the Control Points .
4. Activate the Gumball and select one Control Point .
5. Move it upward. You’ll notice some stretching in the surface but not a lot of bend.

1. Undo the move.
2. Select the black surface.
3. Run the Rebuild command.
4. In the Rebuild Surface dialog box, make sure the options are as follows, and press OK :

( UPointCount=3 VPointCount=3 UDegree=2 VDegree=2 DeleteInput=Yes OutputLayer=Input ReTrim=Yes )

5. Select the black surface and press F10 to turn Control Points on.
6. Double-click the middle control polygon to select the whole row of points.
7. Drag it upward. You’ve created one bend.
8. Double-click the perpendicular control polygon to select the opposite row of points.
9. Drag it upward. You’ve created a dome.

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