Computer Graphics (CS 543) 4 (Part Viewing Camera Control
Computer Graphics (CS 543) Lecture 4 (Part 3): Viewing & Camera
Control
Prof Emmanuel Agu
Computer Science Dept. Worcester Polytechnic Institute (WPI)
3D Viewing?
Objects inside view volume show up on screen Objects outside view volume clipped!
1. Set camera position
2. Set view volume (3D region of interest)
Different View Volume Shapes
y z
x
Orthogonal view volume
y z
x
Perspective view volume
Different view volume => different look Foreshortening? Near objects bigger
Perpective projection has foreshortening Orthogonal projection: no foreshortening
The World Frame
Objects/scene initially defined in world frame Objects positioned, transformations (translate, scale,
rotate) applied to objects in world frame
World frame (Origin at 0,0,0)
Camera Frame
More natural to describe object positions relative to camera (eye) Think about
Our view of the world First person shooter games
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