Introduction to 3-D Primitives and Operations

3-D Solid Geometry 6.12.2

• Primitives
  • Cylinder
  • Sphere
  • Cone
  • Cube
  • Prism
  • Torus
• Geometric operations and terms
  • Truncate
  • Oblique
  • Right
  • Sweep path
  • Profile
  • Axis of rotation
  • Extrude

Geometric Transformation 7.8.1

• Translation
• Rotation
• Scaling
• Reflection

Modeling Relationships

• Parent-Child 7.11.3
  • Hierarchical relationship
• Constrained
  • Degrees of freedom
    • Translational
    • Rotational
  • Ball and joint
  • Hinge
  • Slider

Projection Techniques

Orthographic Projection 8.2

• Glass box metaphor
• Six mutually perpendicular planes of projection
• Unfolding the box and the lines of intersection
• Relationship to planes of projection to ports in 3-D modeling software
• Separate views of the same object
• Choice of views
• Capturing of 2-D views of 3-D objects

Pictorial Projection

• Capture all three dimensions in one view
• Type of projection
• Axonometric 9.1
• Isometric
• Dimetric
• Trimetric
• Oblique 9.5
• Perspective 10.1-10.4
• Convergence of parallel edges

Guidelines for Applying Projection Method

• Arrangement of orthographic views
• Parallel vs. Perspective projection
• Dimensional accuracy of views
• Visual realism

3-D Primitives Modeling Example

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Further Resources