> Thats what I want but I want to keep the vanishing point on X.

Well, technically, the vanishing point *will* stay on X just by moving the
camera or look_at vector. However, if you don't want to actually distort the
scene, that is, if you only want to sort of translate the view along the
viewing window that you have, then you have to do a matrix transformation as
others have said.

Perhaps a simple example scene would help us illustrate the concepts.

- Slime
[ http://www.slimeland.com/ ]
[ http://www.slimeland.com/images/ ]

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