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diff --git a/doc/gl-docs/GLU/lookat.3gl b/doc/gl-docs/GLU/lookat.3gl deleted file mode 100644 index e4a10d486..000000000 --- a/doc/gl-docs/GLU/lookat.3gl +++ /dev/null @@ -1,101 +0,0 @@ -'\" e -'\"! eqn | mmdoc -'\"macro stdmacro -.ds Vn Version 1.2 -.ds Dt 6 March 1997 -.ds Re Release 1.2.0 -.ds Dp May 02 11:53 -.ds Dm 37 lookat.gl -.ds Xs 1014 4 lookat.gl -.TH GLULOOKAT 3G -.SH NAME -.B "gluLookAt -\- define a viewing transformation - -.SH C SPECIFICATION -void \f3gluLookAt\fP( -GLdouble \fIeyeX\fP, -.nf -.ta \w'\f3void \fPgluLookAt( 'u - GLdouble \fIeyeY\fP, - GLdouble \fIeyeZ\fP, - GLdouble \fIcenterX\fP, - GLdouble \fIcenterY\fP, - GLdouble \fIcenterZ\fP, - GLdouble \fIupX\fP, - GLdouble \fIupY\fP, - GLdouble \fIupZ\fP ) -.fi - -.EQ -delim $$ -.EN -.SH PARAMETERS -.TP \w'\f2eyeX\fP\ \f2eyeY\fP\ \f2eyeZ\fP\ \ 'u -\f2eyeX\fP, \f2eyeY\fP, \f2eyeZ\fP -Specifies the position of the eye point. -.TP -\f2centerX\fP, \f2centerY\fP, \f2centerZ\fP -Specifies the position of the reference point. -.TP -\f2upX\fP, \f2upY\fP, \f2upZ\fP -Specifies the direction of the \f2up\fP vector. -.SH DESCRIPTION -\%\f3gluLookAt\fP creates a viewing matrix derived from an eye point, a reference -point indicating the center of the scene, and an \f2UP\fP vector. -.P -The matrix -maps the reference point to the negative \f2z\fP 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 \f2UP\fP -vector projected onto the viewing plane is mapped to the positive \f2y\fP -axis so that it points upward in the viewport. -The \f2UP\fP vector must not be parallel to the line of sight from the -eye point to the reference point. -.P -Let -.sp -.EQ -F ~=~ left ( down 20 { ~ matrix { - ccol {"centerX" above "centerY" above "centerZ"} - ccol { ~-~ above ~-~ above ~-~} - ccol {"eyeX" above "eyeY" above "eyeZ"} -} } ~~ right ) - -.EN - -.sp -Let \f2UP\fP be the vector $("upX", "upY", "upZ")$. -.P -Then normalize as follows: -.EQ -f ~=~ F over {|| F ||} -.EN -.P -.EQ -UP sup prime ~=~ UP over {|| UP ||} -.EN -.sp -.P -Finally, let $s ~=~ f ~times~ UP sup prime$, and $u ~=~ s ~times~ f$. -.P -.sp -M is then constructed as follows: -.EQ -M ~=~ left ( matrix { - ccol { ~s[0] above ~u[0] above -f[0] above 0 } - ccol { ~s[1] above ~u[1] above -f[1] above 0 } - ccol { ~s[2] above ~u[2] above -f[2] above 0 } - ccol { 0 above 0 above 0 above 1 } -} ~~right ) -.EN -.P -and \%\f3gluLookAt\fP is equivalent to -.Ex -glMultMatrixf(M); -glTranslated (-eyex, -eyey, -eyez); -.Ee -.SH SEE ALSO -\f3glFrustum(3G)\fP, \%\f3gluPerspective(3G)\fP |