Subject:
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Re: Simple POV-Ray Question - Perspective
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Newsgroups:
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lugnet.cad.ray
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Date:
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Fri, 23 Jan 2004 19:17:01 GMT
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Viewed:
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1611 times
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In lugnet.cad.ray, Dave Schuler wrote:
> In lugnet.cad.ray, Larry Pieniazek wrote:
> > In lugnet.cad.ray, Kevin L. Clague wrote:
> > > In lugnet.cad.ray, Shaun Sullivan wrote:
> > > > Hi All,
> > > >
> > > > I should know this ... what's the trick for turning off "perspective", if you
> > > > will, so that you can do a straight-on side view? That is, to remove the
> > > > "vanishing into the horizon" effect?
> > > >
> > > > ISO views, is that what it's called? Ugh ...
> > >
> > > Using orthographic does not always work. You can get the same effect by seeing
> > > the camera angle to 0.1
> >
> > Don't you then have to move the camera a ways back to get all your objects in
> > the image compared to larger camera angles?
>
> I've run into this problem, and my caveman-sophistication led me simply to
> translate the object a little to put it back in line with the look_at
> coordinates. Even so, I often have to change the "PCT" value to 5 or 10 to
> accommodate all of my supercool renderings in the image window.
>
> But now that I think about it, I guess that would work best if your whole scene
> is a single object, so it's hardly a panacea.
>
> > This is what I tend to do, long ways away, small canera angle (anaogous to
> > "telephoto" in real photogs, the images there have very little perspective
> > compared to normal which in turn has less than "wide angle").
> >
> > The downside of this is that if you are using fog or mist, your primary scene
> > objects may tend to grayout a bit.
>
> That sounds nifty. I'll have to check it out (and I'd like to experiment with
> more extensive atmospheric effects (more liberal media, perhaps.))
As long as you let L3P calculate the camera distance, the whole model should be
visible, and (mostly) fill the frame. I just copied the L3P auto-camera
algorithm into LDView, and it works consistently for me with camera angles
ranging from 0.1 to 90. (It should work beyond that, but I don't allow it in
LDView.) Maybe L3P doesn't actually work this way, but that would seem really
strange. On the other hand, if you're hand-specifying the camera position, then
it's up to you to make the proper adjustments for camera angle.
True orthographic cameras are a completely different animal. The distance of
the camera from the model has absolutely no effect on the size of the model
(that is, after all, part of the definition of true orthographic). Presumably
POV has some way of specifying a scale factor for an orthographic camera,
because that's the only way to change the size of rendered objects.
--Travis Cobbs
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Message has 1 Reply:
 | | Re: Simple POV-Ray Question - Perspective
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| (...) If you just do a straight "L3P model.dat," then you're right; the whole model fits very nicely in the camera's view (though a little fish-eyed, I find). But if you switch the view to orthographic, the model can appear a bit off-center and (...) (21 years ago, 23-Jan-04, to lugnet.cad.ray)
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Message is in Reply To:
| | Re: Simple POV-Ray Question - Perspective
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| (...) I've run into this problem, and my caveman-sophistication led me simply to translate the object a little to put it back in line with the look_at coordinates. Even so, I often have to change the "PCT" value to 5 or 10 to accommodate all of my (...) (21 years ago, 23-Jan-04, to lugnet.cad.ray)
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