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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Thu, 30 May 2002 00:19:20 GMT
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Viewed:
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761 times
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Anders Isaksson wrote:
> 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)
Thanks, I guess it's ROLL then.
> and CCW being the positive direction.
Hm, first vote for CCW. Why?
> 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).
I agree, see also http://www.spiritone.com/~english/cyclopedia/sky.html
> 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)
Nope, sorry - it doesn't work if you look at the model from +x,
e.g. with -cg30,90
The solution must be to rotate (roll) the camera about the location-look_at vector
using translate/rotate/matrix at the end of the camera definition.
/Lars
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Message has 2 Replies:
 | | Re: Tilting the camera
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| "Lars C. Hassing" <lch@ccieurope.com> skrev i meddelandet news:GwwDyB.Apu@lugnet.com... (...) Because my fingers slipped :-) CW == positive direction -- Anders Isaksson, Sweden BlockCAD: (2 URLs) (22 years ago, 30-May-02, to lugnet.cad.ray)
| | | Re: Tilting the camera
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| Lars C. Hassing wrote... (...) location L3Location sky -y right -4/3*x look_at L3LookAt translate -L3Location #declare vx=vaxis_rotate(x,L3...ollAngle); #declare vy=vaxis_rotate(y,L3...ollAngle); #declare vz=vaxis_rotate(z,L3...ollAngle); matrix (...) (22 years ago, 18-Jun-02, to lugnet.cad.ray)
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Message is in Reply To:
| | Re: Tilting the camera
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| "Lars C. Hassing" <lch@ccieurope.com> skrev i meddelandet news:Gwqr3t.L63@lugnet.com... (...) says: (...) I can imagine 'tilting' or 'slanting' both sideways and forwards/backwards. ROLL, PITCH and YAW are unambiguous. Imagine the camera sitting in (...) (22 years ago, 27-May-02, to lugnet.cad.ray)
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