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 06:35:44 GMT
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Viewed:
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7662 times
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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:
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?
--Travis
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Message has 2 Replies:
 | | Re: Is it possible to use LDView as POV-Ray previewer?
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| (...) Travis, You could orthogonalise the matrix before writing it out. It's relatively easy to make a routine that will find a 'best' rotation matrix that is perpendicular and very close to the original. That way you don't have to deal with the up, (...) (19 years ago, 6-Dec-05, to lugnet.cad.ray)
| | | Re: Is it possible to use LDView as POV-Ray previewer?
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| (...) 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 (URL) I have already made a -csky option. My impression has always been that (...) (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 have already implemented support for the sky vector and for camera roll, see (URL) 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. (...) (19 years ago, 3-Dec-05, to lugnet.cad.ray)
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