Subject:
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Re: LDGlite and LPub
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 26 Oct 2004 14:10:41 GMT
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Viewed:
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1914 times
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In lugnet.cad.dev, Travis Cobbs wrote:
> In lugnet.cad.dev, Don Heyse wrote:
> > In lugnet.cad.dev, Travis Cobbs wrote:
> > > In case you don't want to think about the math, here it is:
> > >
> > > vfov = 2*atan(tan(hfov/2)/(width/height))
> >
> > See, this is why ldview is so much better. I'm still trying to absorb
> > the first post and you whip out the math.
>
> I thank you for the complement, but in this particular instance, I
> have to give credit where credit it is due. I'm sure I could have
> derived the above equation on my own, but here is the actual comment
> out of LDView that I got the above
> from:
>
> // From Lars Hassing:
> // Vertical FOV = 2*atan(tan(hfov/2)/(width/height))
>
> The orginal source was here:
>
> http://www.hassings.dk/l3/l3p_ca.html
Figures. That just confused me again. What does it mean by "The 4/3
aspect ratio is always maintained even if the (horizontal) viewing
angle is changed"? Does l3p not allow tall skinny windows? Should
(width/height) always be (4/3) even if the window is tall and skinny?
Or does it just mean the pov file will always contain the line:
right -4/3*x
(whatever that does.)
Don
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Message has 1 Reply:
 | | Re: LDGlite and LPub
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| (...) I assume that L3P allows the output to be any aspect ratio. The page is a little confusing that way. However, it's trying to tell you how the camera angle argument works, going on the assumption you haven't changed the aspect ratio. Just (...) (20 years ago, 26-Oct-04, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: LDGlite and LPub
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| (...) I thank you for the complement, but in this particular instance, I have to give credit where credit it is due. I'm sure I could have derived the above equation on my own, but here is the actual comment out of LDView that I got the above from: (...) (20 years ago, 26-Oct-04, to lugnet.cad.dev)
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