Larry Hudson <org### [at] yahoocom> wrote:
> wizkidguy wrote:
> > I am trying to rotate a group of objects in a circle. how can i do this? i
> > am using a while loop and i cannot figure out to make them move in a
> > circle.
> >
> Thats what the Povray rotate is for.  But remember, all rotations, (and
> scalings) are relative to the coordinate axes.  This means you have to
> create your set of objects centered at the origin (or translate them
> there) to perform the rotation, then, if necessary, translate them to
> their final location.  This is easiest if you make your set of objects a
> union so you can rotate and translate them as a unit.
>
> As a short example, there was an animated image that was rather commonly
> available many years ago.  Here is my attempt at recreating that image.
>   (The original used a 2x2 checkerboard, mine is 4x4, and I don't
> remember what the original background was like -- I made mine a simple
> sky-sphere.)  Incidentally, the original image was said to be made with
> Povray -- I think that is where I first learned about it.  (Probably
> still at version 1 at that time.)    :-)
>
>
> // balls.pov -- Attempting to reproduce the rotating ball
> //     image from years ago
>
> #include "colors.inc"
> #include "skies.inc"
>
> camera
> {
>  location <3, 5, -15>
>  look_at <0, -2, 0>
>  angle 40
> }
>
> light_source { <-5, 20, -30> White }
> light_source { <10, 50, -20> Gray50 }
>
> sky_sphere { S_Cloud3 }
>
> box
> {
>  <-5, -2.5, -5>, <5, -2, 5>
>  pigment { checker Red White scale 2.5 }
> }
>
> #declare Ball = sphere
> {
>  0, .8
>  pigment { Black }
>  finish { reflection 1 phong .8 }
> }
>
> // Create the circle of 8 balls
> #declare Circle = union
> {
>  #local Angle = 0;
>  #while (Angle < 360)
>   object
>   {
>    Ball
>    translate <4, 0, 0>
>    rotate <0, Angle, 0>
>   }
>   #local Angle = Angle + 45;
>  #end
> }
>
> // Animate (rotate) the circle
> object
> {
>  Circle
>  rotate <0, clock * 45, 0>
> }

Thank you very much. that is exactly the idea i needed!!

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