CIS 736 (Computer Graphics) Lecture 7 of 30 - PowerPoint PPT Presentation
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CIS 736 (Computer Graphics) Lecture 7 of 30
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Title: CIS 736 (Computer Graphics) Lecture 7 of 30 Author: William H. Hsu Last modified by: William H. Hsu Created Date: 10/31/1995 7:46:16 AM Document presentation ... – PowerPoint PPT presentation
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Title: CIS 736 (Computer Graphics) Lecture 7 of 30
1
Lecture 7
Clipping Concluded Introduction to Curve
Representations
Wednesday, February 9, 2000 William H.
Hsu Department of Computing and Information
Sciences, KSU http//www.cis.ksu.edu/bhsu Readin
gs Sections 11.1, 11.2.1-11.2.2, Foley et
al (Reference) Appendix A.9, 6.7-6.11, 10.6-10.8,
Hearn and Baker 2e (Reference) 10.1-1.3,10.6,
Angel 2e
2
Lecture Outline
- Readings
- Sections 11.1, 11.2.1-11.2.2, Foley et al
- Optional references Hearn and Baker 2e, Angel 2e
- Quick Review 3D Viewing
- 3D view volume
- ???
- Clipping (Concluded)
- ???
- ???
- ???
- Introduction to Curve Representations
- What are cubic curves?
- How would we use them to represent surfaces?
- Read about polygon meshes, Bézier curves,
B-splines for next time! - Next Lecture Cubic Curves and Surfaces
3
Quick Review3D View Volume
- 3 Components
- Project proposal (20, 50 points)
- Implementation (50, 125 points)
- Final report (30, 75 points)
- Project Proposal (Due 02/14/2000)
- 1-3 page description of project topic, plan
- Guidelines next (suggested topics, tools to
appear on CIS 736 course web page) - See implementation practicum links (Brown,
Cornell, UNC, others) on 736 page - Implementation
- Students choice of programming language
- Guidelines next Wednesday (and on 736 page)
- Final Report
- 4-6 page report on implementation, experimental
results, interpretation - Peer-reviewed (does not determine grade)
- Reviews graded (short report worth 60 points,
reviews worth 15 points)
4
Quick ReviewFrom Perspective to Parallel
- Perspective-to-Parallel Viewing Transformation
- ???
- ???
- ???
- Why Is This Important?
- ???
- ???
- ???
- ???
- ???
- ???
- ???
- ???
- Reviews graded (short report worth 60 points,
reviews worth 15 points)
5
Clipping
6
Clipping Lines 1Simultaneous Equations
7
Clipping Lines 2Parametric Equations
8
Clipping Polygons
9
Clipping Curves, Text, and Windows
10
Clipping in 3D 1Extending Cohen-Sutherland
11
Clipping in 3D 2Extending Liang-Barsky
12
Quick ReviewSpecifying an Arbitrary 3D View
13
Intro to Curves
14
Intro to Curves
15
Course ProjectMore Guidelines
- 3 Components
- Project proposal (20, 50 points)
- Implementation (50, 125 points)
- Final report (30, 75 points)
- Project Proposal (Due 02/14/2000)
- 1-3 page description of project topic, plan
- Guidelines next (suggested topics, tools to
appear on CIS 736 course web page) - See implementation practicum links (Brown,
Cornell, UNC, others) on 736 page - Implementation
- Students choice of programming language
- Guidelines next Wednesday (and on 736 page)
- Final Report
- 4-6 page report on implementation, experimental
results, interpretation - Peer-reviewed (does not determine grade)
- Reviews graded (short report worth 60 points,
reviews worth 15 points)
16
Course ProjectSuggested Topics
- 3 Components
- Project proposal (20, 50 points)
- Implementation (50, 125 points)
- Final report (30, 75 points)
- Project Proposal (Due 02/14/2000)
- 1-3 page description of project topic, plan
- Guidelines next (suggested topics, tools to
appear on CIS 736 course web page) - See implementation practicum links (Brown,
Cornell, UNC, others) on 736 page - Implementation
- Students choice of programming language
- Guidelines next Wednesday (and on 736 page)
- Final Report
- 4-6 page report on implementation, experimental
results, interpretation - Peer-reviewed (does not determine grade)
- Reviews graded (short report worth 60 points,
reviews worth 15 points)
17
Terminology
- Review Normalizing Transformations
- Nper M Sper SHpar T(PRP) R T(VRP)
(Equation 6.49, FVD) - M
- Line Clipping Determining Parts of Line Segment
Primitives to Display - E
- Division of plane into 9 regions with (4-bit)
outcodes - Testing endpoints of line segment
- Parametric clipping line / rectangle
intersection using parametric equation - Cyrus-Beck general convex 3D polyhedron
- Liang-Barsky more efficient, specialized variant
(upright 2D, 3D clip regions) - Clipping in 3D
- Cuboid truncated viewing pyramid used to clip
after Npar - Frustum truncated viewing pyramid
- Cubic Curves
18
Summary Points
Recommended
CrystalGraphics Presentations
