Hello,

I am a somewhat experienced pov user, but recently I had an idea to do
something that I have never done before and I have no idea how to do it: I
have dual displays at work and I wanted to take some of my images and
render them at 2560x1024.

What I am looking for is a panoramic effect, meaning if I double the display
size I should also double the width of the image, which should result in
there being information on the screen which was not previously visible. I
have tried to simple approach of adding an entry in the quickres.ini file,
but that only resulted in distorted egg shaped spheres with the same
elements that were in the 1280x1024 image. (Basically, what used to be 1
pixel was now 2).

I am honestly not even sure what to call this effect. I have looked at both
the camera 'angle', as well as the 'up' and 'right' vectors, but I am not
quite
sure how to use them. Any help would be appreciated. Thanks in advance,

Duane

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news:web.4207efd235c4c1ada4a324870@news.povray.org...
> I am honestly not even sure what to call this effect. I have looked at
both
> the camera 'angle', as well as the 'up' and 'right' vectors, but I am not
> quite
> sure how to use them. Any help would be appreciated. Thanks in advance,
>
Try

right     x*image_width/image_height

Marc

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up and right define the viewing axis'. Normally, you'd set up as <0,1,0> and
right as the proportion of x to y (1.33*x). If you want to make a
"widescreen" type of image, you'd need to define a different proportion,
e.g. up=<0,1,0> and right=<2,0,0> for an image at (2:1)*M resolutions. In
your case, since you're just doubling the x, right should be <2.66,0,0>.

There is other stuff lurking in the mathematical depth of this, but for
starters, that should suffice (and that's actually all I use anyway...).

Regards,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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Tim Nikias nous apporta ses lumieres en ce 2005-02-07 20:00:
> up and right define the viewing axis'. Normally, you'd set up as <0,1,0> and
> right as the proportion of x to y (1.33*x). If you want to make a
> "widescreen" type of image, you'd need to define a different proportion,
> e.g. up=<0,1,0> and right=<2,0,0> for an image at (2:1)*M resolutions. In
> your case, since you're just doubling the x, right should be <2.66,0,0>.
> 
> There is other stuff lurking in the mathematical depth of this, but for
> starters, that should suffice (and that's actually all I use anyway...).
> 
> Regards,
> Tim
> 
This will show only half the vertical area you had before and the same horizontal
area.
If you want to keep the same vertical view you'd need to double the vewing angle by
doubling the 
angle. This way, the center half will show what you where seeing before, but the view
will expand 
sideway to show more of your scene.

Alain

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> This will show only half the vertical area you had before and the same
horizontal area.
> If you want to keep the same vertical view you'd need to double the vewing
angle by doubling the
> angle. This way, the center half will show what you where seeing before,
but the view will expand
> sideway to show more of your scene.


If you don't specify the angle at all, then this is not the case. Doubling
the right vector expands the horizontal view area without changing the
vertical area.

We had a discussion about this a month or two ago, and your comment is only
true when certain other properties of the camera are specified. I believe
this includes the angle keyword (since it specifies the horizontal angle,
overriding the up/right vector lengths), and *possibly* the direction
keyword.

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

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