2011
Table Of Contents
- Contents
- Get Information
- The User Interface
- Tools in the Application Window
- Other Tool Locations
- Customize the Drawing Environment
- Start and Save Drawings
- Control the Drawing Views
- Change Views
- Use Viewing Tools
- Display Multiple Views in Model Space
- Organize Drawings and Layouts
- Create Single-View Drawings (Model Space)
- Create Multiple-View Drawing Layouts (Paper Space)
- Work with Sheets in a Sheet Set
- Create and Modify Objects
- Control the Properties of Objects
- Work with Object Properties
- Work with Layers
- Work with Colors
- Work with Linetypes
- Control Lineweights
- Control the Display Properties of Certain Objects
- Use Precision Tools
- Use Coordinates and Coordinate Systems (UCS)
- Use Dynamic Input
- Snap to Locations on Objects (Object Snaps)
- Restrict Cursor Movement
- Combine or Offset Points and Coordinates
- Specify Distances
- Extract Geometric Information from Objects
- Use a Calculator
- Draw Geometric Objects
- Change Existing Objects
- Add Constraints to Geometry
- Control the Properties of Objects
- Define and Reference Blocks
- Work with Blocks
- Create and Modify Blocks
- Add Behaviors to Blocks (Dynamic Blocks)
- Overview of Dynamic Blocks
- Quick Start to Creating Dynamic Blocks
- Create and Edit Dynamic Blocks
- Add Constraints to Dynamic Blocks
- Add Action Parameters to Dynamic Blocks
- Work with 3D Models
- Create 3D Models
- Overview of 3D Modeling
- Create Solids and Surfaces from Lines and Curves
- Create Solids
- Create Surfaces
- Create Meshes
- Create Wireframe Models
- Add 3D Thickness to Objects
- Modify 3D Models
- Create Sections and 2D Drawings from 3D Models
- Create 3D Models
- Annotate Drawings
- Work with Annotations
- Hatches, Fills, and Wipeouts
- Notes and Labels
- Tables
- Dimensions and Tolerances
- Understand Basic Concepts of Dimensioning
- Use Dimension Styles
- Set the Scale for Dimensions
- Create Dimensions
- Modify Existing Dimensions
- Add Geometric Tolerances
- Plot and Publish Drawings
- Prepare Drawings for Plotting and Publishing
- Quick Start to Saving Settings for Plotting and Publishing
- Specify Page Setup Settings
- Overview of Page Setup Settings
- Select a Printer or Plotter for a Layout
- Select a Paper Size for a Layout
- Set the Plot Area of a Layout
- Adjust the Plot Offset of a Layout
- Set the Plot Scale for a Layout
- Set the Lineweight Scale for a Layout
- Select a Plot Style Table for a Layout
- Set Shaded Viewport and Plot Options for a Layout
- Determine the Drawing Orientation of a Layout
- Use the Layout Wizard to Specify Layout Settings
- Import PCP or PC2 Settings into a Layout
- Create and Use Named Page Setups
- Use Named Page Setups with Sheet Sets
- Plot Drawings
- Quick Start to Plotting
- Overview of Plotting
- Use a Page Setup to Specify Plot Settings
- Select a Printer or Plotter
- Specify the Area to Plot
- Set Paper Size
- Position the Drawing on the Paper
- Control How Objects Are Plotted
- Preview a Plot
- Plot Files to Other Formats
- Publish Drawings
- Prepare Drawings for Plotting and Publishing
- Share Data Between Files
- Reference Other Drawing Files
- Link and Embed Data (OLE)
- Work with Data in Other Formats
- Import Other File Formats
- Attach Files as Underlays
- Attach Raster Image Files
- Export Drawings to Other File Formats
- Use Drawings from Different Versions and Applications
- Extract Data from Drawings and Spreadsheets
- Access External Databases
- Overview of Using External Databases
- Access a Database from Within AutoCAD
- Link Database Records to Graphical Objects
- Use Labels to Display Database Information in the Drawing
- Use Queries to Filter Database Information
- Share Link and Label Templates and Queries with Other Users
- Work with Links in Files from Earlier Releases
- Manage Files with Autodesk Vault
- Collaborate with Others
- Protect and Sign Drawings
- Use the Internet for Collaboration
- Use Markups for Design Review
- Render Drawings
- Draw 2D Isometric Views
- Add Lighting to Your Model
- Materials and Textures
- Render 3D Objects for Realism
- Glossary
- Index
See also:
■ Draw Splines on page 679
■ Modify Splines on page 794
NURBS surfaces can be created from a number of 2D objects, including edge
subobjects, polylines, and arcs. But the spline tool is the only object that has
options that are compatible with creating NURBS surface. Not only do splines
consists of Bezier arcs, but they also can be defined with both control vertices
and fit points. The fit points and control vertices offer different editing options
such as knot parameterization and degree options. See
Moving Fit Points vs. Moving Control Vertices
NURBS curves have both fit points and control vertices. The fit points lie on
the line, and the control vertices lay outside the line. Use fit points to make
a change to one small part of a curve; use control vertices to make changes
that will affect the shape of the curve as a whole.
Clamp Surfaces and Curves with Open and Closed Geometry
NURBS surfaces and curves can have a clamp, closed, or open form. The form
affects how the object deforms.
■ Open Curves and surfaces - have their start and end CVs in different
positions - it doesn’t form a loop. If you snap the start and end CVs of an
open curve to the same position, it’s still an open curve, because you can
still drag these points away from one another.
■ Closed Curves and Surfaces - a loop with coinciding start and end CVs.
Where they meet is called a seam. If you move one CV, the other moves
with it.
■ Clamp Curve - is a closed loop with a seam that creates extra, unseen CVs.
These unseen CVs can cause the shape to wrinkle and crease when it is
reshaped.
Quick Reference
Commands
SPLINE
Creates a smooth curve that passes through fit points or near control vertices.
Create NURBS Surfaces | 1035