relative motion

This file has 2 parts. The first part is the ini file for the animation, the second part (named turntable.pov) is the actual code to render each frame.
This is used with POVray 3.7, and to produce the animation you run the ini file and then combine the frames produced to produce an animation, such as with imagemagick.

The main file has several options.
Each option when disabled starts with "/*". To enable that, remove the "/*".
Each option ends with "// */"
The most obvious ones are either a stationary sun or a circling sun, and to go with them a point below the edge camera which is either circling below as the turntable rotates or stationary.

Additionally there are several choices of cameras. There is the option of one at the centre or the edge of the turntable, and this can be either rotating with the turntable (circling for the edge one) or stationary.
Additionally, they can be counterrotated to counter the rotation of the turntable or the circling of the sun.

Finally there are some extra points which are common which is a point below the central camera and a light source, and some math to position things.

For the math based section, in the animation file, the initial and final clock represent the range of motion which should be left at 0 and 360. The final frame indicates the number of frames the animation has, if you would like a smoother animation with more frames, increase this.

For turntable.pov, the options are:
r - radius of turntable.
R - distance to object (sun).

Sr - size of the sun.
Cr - size of the small ball to represent the position of the cameras.

--.ini--

Antialias=Off
Antialias_Threshold=0.1
Antialias_Depth=2

Input_File_Name="turntable.pov"

Initial_Frame=1
Final_Frame=360
Initial_Clock=0
Final_Clock=360

Cyclic_Animation=on
Pause_when_Done=off

--turntable.pov--
#version 3.7;
global_settings {  assumed_gamma 1.0 }

#declare r=6.4;
#declare R=150000;
//#declare r=6.4;
//#declare R=150000;

#declare theta=clock;
#declare trad=radians(theta);
#declare st=sin(trad);
#declare ct=cos(trad);

#declare Sr=1000;

#declare Cr=0.05;


//Central rotating camera
camera{ angle 90
    right x*image_width/image_height
    location  <0 , 0 , 0>
    look_at   <ct , 0 , st>
}// */

/*//Edge circling camera
camera{ angle 90
    right x*image_width/image_height
    location  <r*ct , 0 , r*st>
    look_at   <(r+1)*ct , 0 , (r+1)*st>
}// */

/*//Edge circling, counterrotating camera
camera{ angle 90
    right x*image_width/image_height
    location  <r*ct , 0 , r*st>
    look_at   <r*ct+1 , 0 , r*st>
}// */

/*//Central, stationry camera
camera{ angle 90
    right x*image_width/image_height
    location  <0 , 0 , 0>
    look_at   <1 , 0 , 0>
}// */

/*//Edge stationary camera
camera{ angle 90
    right x*image_width/image_height
    location  <r , 0 , 0>
    look_at   <r+1 , 0 , 0>
}// */

/*//Central counterrotating camera
camera{ angle 90
    right x*image_width/image_height
    location  <0 , 0 , 0>
    look_at   <ct , 0 , -st>
}// */

/*//Edge counterrotating camera
camera{ angle 90
    right x*image_width/image_height
    location  <r , 0 , 0>
    look_at   <r+ct , 0 , -st>
}// */


//Lights
light_source{ <0,0,0>
    color rgb<1,1,1>
}


//Stationary sun
sphere{ <R , 0 , 0>, Sr
    texture { pigment{ rgb<1,1,0> }
        finish { diffuse 0.9
            phong 1}
    }
}// */

/*//Circling sun
sphere{ <R*ct , 0 , -R*st>, Sr
    texture { pigment{ rgb<1,1,0> }
        finish { diffuse 0.9
            phong 1}
    }
}// */


// Point below circling near camera:
sphere{ <r*ct,-1,r*st>, Cr
    texture { pigment{ rgb<0,1,0> }
    }
}// */

/*// Point below stationary near camera:
sphere{ <r,-1,0>, Cr
    texture { pigment{ rgb<0,1,0> }
    }
}// */

// Point below central camera:
sphere{ <0,-1,0>, Cr
    texture { pigment{ rgb<0,1,0> }
    }
}//