Graphics Programs Reference
In-Depth Information
The PRESSPULL command allows you to create 3D geometry by extruding a
closed boundary. PRESSPULL differs from EXTRUDE in that the EXTRUDE command re-
quires 2D geometry while PRESSPULL can use closed boundaries formed by other 3D
solids.
To press or pull within a closed boundary to create a 3D object, click Presspull on the
Solid tab's Solid panel, and then click as required to specify a closed boundary. After
you've clicked in a closed boundary, drag or specify the distance on the extrusion you
want to create.
Loft open and closed objects
Lofting allows you to select a series of 2D cross-sections to create a surface or
3D solid. The selected cross-sections are used to define the outer surface that's gener-
ated. You must select a minimum of two cross-sections. If you select open objects, the
resulting loft is a surface; if you select closed objects, the resulting loft can be either a
surface or 3D solid, depending on the current value of the MOde option for the LOFT
command.
You can loft objects along a path using guide curves, or just between the selected cross-
sections (see Figure 22-9). To loft open or closed 2D objects, open the Sweep/Loft drop-
down on the Solid tab's Solid panel. Use the MOde option to control whether you create
a surface or 3D solid from a closed object cross-sections, and specify how the loft object
should be calculated.
Figure 22-9: Using cross-sections to created a lofted object
Sweep open and closed objects along a path
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