Graphics Pipeline and Hierarchical Modeling-Advanced multimedia technology:Computer graphics

(1)

Graphics Pipeline

and Hierarchical Modeling

Advanced Multimedia Technology: Computer Graphics

Yung-Yu Chuang

2005/12/14

with slides by Brian Curless, Zoran Popovic, Robin Chen and Doug J ames

(2)

Announcements

(3)

Review of graphics pipeline

(4)

(5)

• Rasterization • Visibility

(6)

(7)

Visibility Algorithms

• Painter’s algorithm • Ray casting

• Z-buffer

(8)

(9)

(10)

(11)

(12)

(13)

(14)

(15)

(16)

(17)

Shading

• Shading model determines the color values for each pixel

• To accurately determine the right color is a har d problem because photons can

– Interact with the atmosphere

– Be absorbed or reflected by a surface

– Bounce around and around within the scene

• Here, we are going to use a widely used fast ap proximation of reality called the Phong shading

(18)

(19)

(20)

(21)

(22)

Surface types

(23)

(24)

(25)

(26)

(27)

(28)

(29)

(30)

(31)

(32)

(33)

(34)

(35)

(36)

(37)

• Rasterization • Visibility

(38)

(39)

(40)

(41)

(42)

(43)

(44)

(45)

(46)

(47)