Paul Martz wrote:
Zooming merely changes the field of view without changing the view
position.
Think of a photographer changing lenses on a camera without changing
his physical location. You change the projection matrix to change the
field of view, not the modelview matrix.
But that's *your* definition of zooming...
No, it's the computer graphics industry definition of "zoom", as defined by
Foley and Van Dam, the Real-Time Rendering book, and the OpenGL red book.
It's a word that has its root in photography, which shares the same
definition. Zooming magnifies an image; it does not affect the view
position.
Words mean things. Programming is a very precise activity and we should
select our words carefully when describing what we are trying to do. I would
be doing the OP a disservice if I did not correct his usage and inform him.
Sorry for yapping about this, I'm having a bad day (and can't really
figure out what is the real issue in my head...)
Paul
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