08-06-2003
FreeBSD or Linux
Hello all!
I have been using FreeBSD for years, however, I have colleagues who prefer Linux. For some reason we can never meet eye to eye on what the advantage is from one system to the other.
My question is, can anyone explain what the differences are between both systems in respect to each other?
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LEARN ABOUT CENTOS
glulookat
GLULOOKAT(3G) OpenGL Manual GLULOOKAT(3G)
NAME
gluLookAt - define a viewing transformation
C SPECIFICATION
void gluLookAt(GLdouble eyeX, GLdouble eyeY, GLdouble eyeZ, GLdouble centerX, GLdouble centerY, GLdouble centerZ, GLdouble upX,
GLdouble upY, GLdouble upZ);
PARAMETERS
eyeX, eyeY, eyeZ
Specifies the position of the eye point.
centerX, centerY, centerZ
Specifies the position of the reference point.
upX, upY, upZ
Specifies the direction of the up vector.
DESCRIPTION
gluLookAt creates a viewing matrix derived from an eye point, a reference point indicating the center of the scene, and an UP vector.
The matrix maps the reference point to the negative z axis and the eye point to the origin. When a typical projection matrix is used, the
center of the scene therefore maps to the center of the viewport. Similarly, the direction described by the UP vector projected onto the
viewing plane is mapped to the positive y axis so that it points upward in the viewport. The UP vector must not be parallel to the line of
sight from the eye point to the reference point.
Let
F = centerX - eyeX centerY - eyeY centerZ - eyeZ
Let UP be the vector upX upY upZ.
Then normalize as follows: f = F F
UP '' = UP UP
Finally, let s = f x UP '', and u = s x f.
M is then constructed as follows: M = s 0 s 1 s 2 0 u 0 u 1 u 2 0 - f 0 - f 1 - f 2 0 0 0 0 1
and gluLookAt is equivalent to
glMultMatrixf(M);
glTranslated(-eyex, -eyey, -eyez);
SEE ALSO
gluPerspective(), glFrustum()
COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 06/10/2014 GLULOOKAT(3G)