CIS 736 (Computer Graphics) Lecture 5 of 30 - PowerPoint PPT Presentation

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CIS 736 (Computer Graphics) Lecture 5 of 30

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Center of projection (COP), direction of projection (DOP) ... Specifying 'eye': PRP, projection type COP, DOP. Viewing-reference coordinate (VRC) system ... – PowerPoint PPT presentation

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Title: CIS 736 (Computer Graphics) Lecture 5 of 30


1
Lecture 5
Introduction to 3D Viewing, Projections, and
Clipping
Wednesday, February 2, 2000 William H.
Hsu Department of Computing and Information
Sciences, KSU http//www.cis.ksu.edu/bhsu Readin
gs Chapters 4, 6, Foley et al Chapter 1,
Sections 5.1-5.4, Angel Slide Set 4, VanDam
2
Lecture Outline
  • 3D Viewing (Continued)
  • Specifying arbitrary 3D views
  • Projection
  • View volume for clipping projected scene
  • Applying planar-geometric-projection concepts
  • Projections (Continued)
  • General concepts
  • View plane
  • View reference point (VRP), view-plane normal
    (VPN), view up vector (VUP)
  • Specifying eye
  • Projection reference point (PRP), projection type
  • Center of projection (COP), direction of
    projection (DOP)
  • Viewing-reference coordinate (VRC) system
  • Implementing Projections
  • Next Lecture Projections and Clipping Concluded,
    Intro to OpenGL

3
Terminology
  • Projections
  • General concepts
  • View plane
  • View reference point (VRP)
  • View-plane normal (VPN)
  • View up vector (VUP)
  • World coordinates (x, y, z) system
  • Viewing reference coordinate (VRC) system (u, v,
    n)
  • Specifying eye
  • Projection reference point (PRP)
  • Projection type
  • Center of projection (COP), direction of
    projection (DOP)
  • Viewing-reference coordinate (VRC) system
  • Implementing Projections and Clipping
  • Truncated view volume (cuboid or frustum)
  • Front, back clipping planes

4
Summary Points
  • 3D Viewing (Continued)
  • Specifying arbitrary 3D views (Section 6.2, FVD)
  • Projection
  • View volume for clipping projected scene
  • Applying planar-geometric-projection concepts
    (Sections 6.1, 6.4-6.5)
  • Examples (Section 6.3)
  • Projections (Continued)
  • General concepts VRP, VPN, VUP (Section 6.2)
  • Specifying eye PRP, projection type ? COP, DOP
  • Viewing-reference coordinate (VRC) system
  • Result truncated view volume
  • Implementing Projections
  • Pipeline (Figure 6.46, Section 6.5)
  • Case studies (Section 6.3)
  • Next Lecture Projections and Clipping Concluded,
    Intro to OpenGL
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