An Introduction To AutoCAD 3D Modelling Tools

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An Introduction To AutoCAD 3D Modelling
Toolshttp//crbtech.in/CAD-CAM-Training/
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Introduction to AutoCAD

• AutoCAD is a commercial computer-aided design
  (CAD) and drafting software application. It was
  first time released by Autodesk in 1982 as a
  desktop app running on microcomputers with
  internal graphics controllers.

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3D Co-ordinate systems

• Absolute 3D co-ordinate system
• In this 3D co-ordinate systen, XY plane is
  assumed as parallel to the computer screen and
  Z axis is assumed as perpendicular to the screen
  of the computer projecting outward.

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• Relative cylindrical co-ordinate system
• In this co-ordinate system, suppose we want to
  plot a point which is located at (4, lt30, 5),then
  5 is marked using relative cylindrical
  co-ordinate system.Then it is marked at 4 units
  from the last reference point along x axis, 30
  degrees from the x-axis measured.

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• Relative spherical co-ordinate system
• In this type of co-ordinate system, a point at
  (5,lt30,lt40 )is at 5 units from the last reference
  point along x axis, 30 degrees from the x-axis
  measured in the anticlockwise direction in xy
  plane and 40 degrees up from xy plane.

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Types of 3D modelling

• Wire frame modelling
• In this type of modelling, objects are
  represented in 3D representation by using lines,
  arcs and circles. It is contains only edge
  details and therfore does not have surfaces. Only
  skeletal are shown.

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• Surface modelling
• In this type of modelling 3D objects are
  represented by using opaque surfaces . The inner
  portion of the object is hollow. The details
  behind the surfaces are not shown.

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• Solid modelling
• In this type of modelling, 3D solid objects are
  is produced. It looks like a solid object which
  is made of wood. Hence it can be cut into
  pieces. Therefore it is easy to determine mass
  properties of solid models.

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• Thank You !