[PyOpenGL-Devel] [ pyopengl-Bugs-3409147 ] Wrong gluLookAt Documentation

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Bugs item #3409147, was opened at 2011-09-14 11:21
Message generated for change (Tracker Item Submitted) made by dvdhrm
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Category: doc
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: David Herrmann (dvdhrm)
Assigned to: Mike C. Fletcher (mcfletch)
Summary: Wrong gluLookAt Documentation

Initial Comment:
The documentation of the algorithm behind gluLookAt is partly wrong. See:
http://pyopengl.sourceforge.net/documentation/manual/gluLookAt.3G.html

"s" needs to be normalized because it is used for rotation, not translation. Also other gluLookAt implementations do this. For instance see:
http://www.opengl.org/wiki/GluLookAt_code

And also if "s" is normalized, there is no need to normalize UP anymore.

So "s" is computed this way:
tmp = f x UP
s = tmp || tmp ||
and UP' can be removed.

Cheers
David

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