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Jong wrote:
>
> Dear All,
>
> I've been experimenting a little bit with the camera position. I would
> like to maintain my rendered
> image orientation. For example, I want my x-axis(Red bar) positioned
> horizontal z-axis(Green bar) vertical even if I change my camera
> position while looking at the same position of the object.
If you want z vertical and x/y horizontal, you have to use something like:
camera {
location <10, 10, 10>
direction z
sky z
up z
right (4/3)*x
look_at <0, 0, 0>
}
> One more question:
> What are the meanings of the non-zero values of y and z in "right
> <0.35816, 0, 0.206784>".
> I learned that x value of right< , , > maintains ratio of the image
> output. But for the y and z, I have
> hard time understanding.
>
quoting from the doumentation:
"Note that the up, right, and direction vectors should always remain
perpendicular to each other or the image will be distorted. If this is not
the case a warning message will be printed. The vista buffer will not work
for non-perpendicular camera vectors. If you specify the 3 vectors as
initially perpendicular and do not explicitly re-specify the after any
look_at or rotate vectors, the everything will work fine."
BTW, please don't post html and binaries in this group, if an illustrating
picture is necessary post it to p.b.i.
Christoph
--
Christoph Hormann <chr### [at] gmx de>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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