Try this sequence to produce a spiral motion of the camera:

  plane { <0, 1, 0>, -2
    pigment {
      checker color White, color Green
    }
  }

#declare center_object =            // whatever object you have
     box {<-.5,-.5,-.5>,<.5,.5,.5> pigment {checker color Red,color
lue }  }

     object {center_object}

// adjust any or all of these 3 to change the spiral
#declare revolutions = 10 ;
#declare constant_a = 0.05 ;
#declare constant_b = 1 ;

#declare theta = revolutions*360*clock ;
#declare spiral_radius = constant_b*exp(constant_a*radians(theta)) ;   //
logarithmic spiral (equiangular)
#declare ex = spiral_radius*cos(theta) ;
#declare zee = spiral_radius*sin(theta) ;

camera {angle 100
        location  <ex,spiral_radius,-zee>
        look_at   <0,0,0>        // or wherever your object is located
       }



"tgl" <tgl### [at] canadacom> wrote in message
news:web.3f507d5f85bbe1cfe331e8d30@news.povray.org...
> Hello Friends
>  I have been part of the news gruop for some time as a silent reader but
> this is my first post. I have not been able to find a satisfactory answer
> to a technical problem I'm having within previous posts in the newsgroup.
>  Can any math wizz out there tell me what the formula would look like that
> would describe the motion of a camera that looked at one spot in space
> continually as it gradually began to move in a circular and expanding
> spiral, steadily gaining speed and steadily rising above what it is
looking
> at?
>  If this motion could be visualized by a single curved line, it would
> probably appear to be a very symetrical and conical tornado.
>  Also; how would a mathematical formula discribing the above motion be
> worded in POVray?
>
>                                     Thanx
>
>
>

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