Subject:
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Re: Tilting the camera
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Newsgroups:
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lugnet.cad.ray
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Date:
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Mon, 27 May 2002 13:57:33 GMT
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Viewed:
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859 times
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"Lars C. Hassing" <lch@ccieurope.com> skrev i meddelandet
news:Gwqr3t.L63@lugnet.com...
> Travis Cobbs wrote...
> > In lugnet.cad.ray, Don Heyse writes:
> > > Sproat called it Roll in his tutorial.
> >
> > That's what I would call it.
>
> I noticed Sproat calls it roll: "How to roll the camera", but he also • says:
> "I'm really talking about tilting the camera to one side."
> And to me (being a non-English-native) roll is more ambiguous than tilt.
> [...]
> > I would think this would be pitch. (Yaw would be left/right.)
>
> Yaw ? You said you would call it roll ?
I can imagine 'tilting' or 'slanting' both sideways and forwards/backwards.
ROLL, PITCH and YAW are unambiguous.
Imagine the camera sitting in the cockpit of a plane, looking forward, then
ROLL - the rotation around the axis 'tail <--> nose'
PITCH - rotation around the axis 'right wing <--> left wing'
YAW - rotation around the third axis (like turning your head)
and CCW being the positive direction.
Your problems with the sky vector may be the fact that sky implies a ROLL
and this ROLL is applied _first_ to match the camera and the sky vector,
then look_at changes the YAW, and finally the PITCH (at least that's my
interpretation of the POV documentation).
Modifying both SKY and RIGHT seems to do the job for me:
#declare TiltAngle = 30
#declare CameraRoll = -TiltAngle*pi/180 // '-' to get CCW for positive
angles
sky -y*cos(CameraRoll) - 4/3*x*sin(CameraRoll)
right -4/3*x*cos(CameraRoll) - y*sin(CameraRoll)
--
Anders Isaksson, Sweden
BlockCAD: http://user.tninet.se/~hbh828t/proglego.htm
Gallery: http://user.tninet.se/~hbh828t/gallery/index.htm
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Message has 1 Reply:
 | | Re: Tilting the camera
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| (...) Thanks, I guess it's ROLL then. (...) Hm, first vote for CCW. Why? (...) I agree, see also (URL) Modifying both SKY and RIGHT seems to do the job for me: (...) Nope, sorry - it doesn't work if you look at the model from +x, e.g. with -cg30,90 (...) (23 years ago, 30-May-02, to lugnet.cad.ray)
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Message is in Reply To:
| | Re: Tilting the camera
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| Travis Cobbs wrote... (...) I noticed Sproat calls it roll: "How to roll the camera", but he also says: "I'm really talking about tilting the camera to one side." And to me (being a non-English-native) roll is more ambiguous than tilt. Anyone else ? (...) (23 years ago, 26-May-02, to lugnet.cad.ray)
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