Subject:
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Re: Is it possible to use LDView as POV-Ray previewer?
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Newsgroups:
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lugnet.cad.ray
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Date:
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Tue, 6 Dec 2005 16:04:44 GMT
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Viewed:
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7623 times
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In lugnet.cad.ray, Travis Cobbs wrote:
> In lugnet.cad.ray, Lars C. Hassing wrote:
> > But perhaps it would be more convenient to have a -matrix option
> > to directly specify the camera matrix ?
> > I know POV supports the matrix keyword inside the camera.
>
> I did some investigation (read: experimentation), and came to the conclusion
> that I'm not going to be able to produce a camera matrix that POV will accept.
> The problem is that I use floats in my matrix, and they're not accurate enough
> to produce results that POV will accept. (It complains about things not being
> perpendicular. It won't do this if you manually turn off the Vista buffer, but
> I get the impression that doing so will slow rendering down, and disable certain
> features.)
>
> I was able to successfully generate a camera with the following settings,
> though:
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> location
> direction
> up
> right
> angle
>
> I cheated and made small adjustments to my up and right vectors to force them to
> be perpendicular to my direction vector in double precision. Fortunately, up
> and right don't have to be perpendicular to each other, since having all three
> vectors be perpendicular in double precision would have been a lot more
> difficult.
>
> You already support angle and location. Is there any chance you can support
> command-line specification of the direction, up, and right vectors?
Well, yes, but could you try generating these parameters in stead:
location
sky
look_at
angle
These should be adequate to fully describe the camera.
ldglite uses them http://ldglite.sourceforge.net/ldglitepov.html
and I have already made a -csky option.
My impression has always been that you should not tamper with
the up and right vectors, only for changing the aspect radio.
I have already added an option for aspect ratio that modifies
the right vector.
So, if you could generate the sky vector that would be great.
/Lars
Good links:
http://library.thinkquest.org/3285/language/camera.html
http://www.nada.kth.se/hacks/doc/PoVRay/pov114.html
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Message has 2 Replies:
 | | Re: Is it possible to use LDView as POV-Ray previewer?
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| (...) I can do that. Unless I'm badly mistaken, my existing up will work fine as a sky vector. (...) Reading between the lines of the descriptions of the various camera settings, it really looks like POV-Ray automatically generates direction, up, (...) (19 years ago, 6-Dec-05, to lugnet.cad.ray)
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Message is in Reply To:
| | Re: Is it possible to use LDView as POV-Ray previewer?
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| (...) I did some investigation (read: experimentation), and came to the conclusion that I'm not going to be able to produce a camera matrix that POV will accept. The problem is that I use floats in my matrix, and they're not accurate enough to (...) (19 years ago, 6-Dec-05, to lugnet.cad.ray)
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