The OpenGL function gluLookAt( ).

摘要

As any image on computer screens rendered using coloured pixels is actually two-dimensional, OpenGL applies model view transformation and projection transformation to simulate three-dimensional space in the real world. The function gluLookAt( ) is a viewing transformation specifying a viewing point, a “look at” point to which the camera or eye look at and a vector specifying upward direction.; In this major report, the author discusses the model view transformation and function gluLookAt( ) and designs two programs, the Demonstration of Function gluLookAt( ) which demonstrates a series of transformations of translations and rotations encapsulated in the gluLookAt( ) routine and the Small Town Animation System which draws a scene of a small town where there are some moving objects such as trucks and helicopter and some stationary objects such as buildings and houses, and also there is a camera that can be moved in several ways. These objects look at each other according to user's choice. The purpose of the project is to demonstrate how OpenGL function gluLookAt( ) works and the concept of model view transformation.