Table of Contents
3D Viewing & Clipping
Where do geometries come from?
Getting Geometry on the Screen
Viewing and Projection
Pinhole Optics
Perspective Projection of a Point
Problems with Pinholes
Image Formation
Orthographic Projection
A Simple Perspective Camera
Similar Triangles
A Perspective Projection Matrix
Wait, there’s more!
The View Volume
But wait...
Camera Control Values
A Popular View Specification Approach
Implementation
The Whole Picture
It's a Piece of Cake
Virtual Trackballs
Clipping
Normalizing the Viewing Frustum
The Normalized Frustum
But wait! Divide by zero? Oh. Whew.
Clipping to a Cube
Line Clipping
Line Clipping
Cohen-Sutherland Algorithm
Cohen-Sutherland Algorithm: Subdivision
Other Line Clipping Algorithms
Polygon Clipping
Sutherland-Hodgman Polygon Clipping Algorithm
Sutherland-Hodgman Polygon Clipping Algorithm (Cont.)
Cleaning Up
More Polygon Clipping (2D only)
|