This is the terminology from the Free CAD Lesson Intro to 3D
3D Auto CAD
2-D - A concept of displaying real-world objects on a flat surface showing only height and width. This system uses only the X and Y axes.
3-D - A way of displaying real-world object in a more natural way by adding depth to the height and width. This system uses the X Y and Z axes.Boolean Operations
Commands that allow you to add, subtract or intersect solid objects in AutoCAD.
Complex surface - Generally a curved surface. Examples: car fender, landscape contour.
Elevation - The difference between an object being at zero on the Z-axis and the height that it is above zero.
Extrude - The extrude command raises the shape of a 2D outline into a 3D solid. For example, a circle would be extruded into a cylinder.
Face - The simplest true 3-D surface.
Facet - A three or four sided polygon that represents a piece (or section) of a 3-D surface.
Hidden line removal - A way of hiding lines that would not be visible if you were viewing the actual object you have drawn in AutoCAD. (Command: HIDE)Isometric Drawing
A simple way of achieving a '3-D' appearance using 2-D drawing methods.
Plan View - Also known as the top view, a plan view looks directly down the WCS Z-axis to the X-Y axis.Primitive
A basic solid building block. Examples would be boxes, cones, cylinders.Region
A 2-D area consisting of lines, arcs, etc.Rendering
A complex way of adding photo-realistic qualities to a 3-D model you have created.
Shading - A quick way of adding color to a 3-D object you have drawn. (Command: SHADE)
Solid Model - A 3-D model creating using solid 'building blocks'. This is the most accurate way of representing real-world objects in CAD.
Surface Model - A 3-D model defined by surfaces. The surface consists of polygons. (See facets.)Thickness
A property of lines and other objects that gives them a 3-D like appearance.USC
The user co-ordinate system. This is defined by the person drawing to have easier access to portions of a 3-D model.View
A particular view of the object you have created.Viewport
A window into your drawing showing a particular view. You can have several viewports on your screen. Different from the viewports used in plotting.Wireframe Model
A 3-D shape that is defined by lines and curves. A skeletal representation. Hidden line removal is not possible with this model.Z-axis
The third axis that defines the depth.