Query: glulookat
OS: osx
Section: 3g
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
GLULOOKAT(3G) GLULOOKAT(3G)NAMEgluLookAt - define a viewing transformationC SPECIFICATIONvoid gluLookAt( GLdouble eyeX, GLdouble eyeY, GLdouble eyeZ, GLdouble centerX, GLdouble centerY, GLdouble centerZ, GLdouble upX, GLdouble upY, GLdouble upZ )PARAMETERSeyeX, 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.DESCRIPTIONgluLookAt 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 centerX - eyeX F = 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: s[0] s[1] s[2] 0 u[0] u[1] u[2] 0 M = -f[0] -f[1] -f[2] 0 0 0 0 1 and gluLookAt is equivalent to glMultMatrixf(M); glTranslated (-eyeX, -eyeY, -eyeZ);SEE ALSOglFrustum, gluPerspective GLULOOKAT(3G)
Related Man Pages |
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glulookat(3g) - redhat |
glulookat(3g) - centos |
glulookat(3g) - xfree86 |
glulookat(3g) - suse |
gluperspective(3g) - osx |
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