Introduction to 3D Drawing

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Introduction to 3D Drawing

• Ipek Gursel
• Office A301
• igursel_at_yediyepe.edu.tr

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Outline

• 3D drawing Perspective
• Types
• Examples
• Assignment
• A brief introduction to AutoCAD

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Perspective a definition...

• the technique of representing three-dimensional
  objects and depth relationships on a
  two-dimensional surface.
• may be used in paintings, architectural space
  representations, computer graphics, multimedia
  applications, computer games, etc.

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types...

• paraline (orthographic)
• isometric
• axonometric

• 2. conical

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ISOMETRIC

• the angles between the projection of the x, y,
  and z axes are all the same 120.

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An example
Plan Front view Side view
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An example
Plan
Side view
Front view
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Lets draw a simple rectangle
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3
5

1. Lets draw the x, y and z axis.
2. Measure off height, depth and length
3. Draw your solid lines

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10
5
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A hands on exercise
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8
8
2
4
2
2
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• A brief introduction to AUTOCAD

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What is AutoCAD

• AutoCAD is a computer-aided drafting (CAD)
  software package for 2D and 3D design and
  drafting, developed and sold by Autodesk. It
  currently runs exclusively on Microsoft operating
  systems. Versions for Unix and Mac were released
  (until R13), but these met with limited market
  acceptance and were later dropped.
• Architects and engineers (AEC), drafters,
  cartographers, and other professionals involved
  with design
• We have AutoCAD2006 installed in our machines

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Some basics

• 3d space all objects are three dimensional in
  real life. However, we cannot represent the third
  dimension on a 2d surface, such as a piece of
  paper or your monitors. So we use the Cartesian
  coordinate system on the 3d world of a CAD tool
  (remember your analytical geometry courses).
• All the points in your space is defined by its x,
  y and z coordinates. In other words, AutoCAD uses
  points to determine where an object is located.

y
(6,4,0)
z
(3,2,5)
y
(2,1,0)
(0,0,5)
x
(3,0,5)
x
(0,0,0)
(3,0,0)
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UCS and WCS

• The AutoCAD world is 3 dimensional. However, if
  we want to draw a 2d object, such as a plan or a
  section, we will use only 2 dimensions (x and y).
• WCS (world coordinate system) is the imaginary
  plane that is parallel to the ground. It is the
  default coordinate system.
• Modifications made to the World Coordinate System
  (WCS) result in a User Coordinate System (UCS).
  It is the plane that you work on. It enables the
  user to draw 3 dimensional objects.
• To create a new UCS, type ucs on the command
  window, then say New and specify 3 points on your
  new UCS plane.

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How do we give a command?

• Command line
• Toolbars
• Drop-down menus
• You can pick any one(s) that you are comfortable
  with.

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Next week

• We will learcn to draw simple shapes, both 2D and
  3D) with AutoCAD.
• We will have hands-on exercises.
• This weeks assignment is due Thursday, March 9.
  You will hand in the completed assignment sheets.