Cool .. that seems to do the trick, as Spock has shown in p.b.a. Thanks!

--
Paul Vanukoff
van### [at] primenetcom


Adam Coffman wrote in message <386A5828.984A09DC@ipfw.edu>...
>Is it too late?  I worked out an equation for what I think you're
>trying to get.  The radius depends on the angle A in a more
>complicated way, but this seems to close up the gap.
>
>
>#declare O_Ying=
>union
>{
>    #declare R=0;
>    #while (R<1.0001)
>    #declare A=R*180;
>
>        #declare X=2*cos(radians(A))/(-3+cos(radians(A)));
>        #declare Y=0.0;
>        #declare Z=2*sin(radians(A))/(-3+cos(radians(A)));
>
>        sphere
>        {
>            <X,Y,Z>,(-1+cos(radians(A)))/(-3+cos(radians(A)))
>        }
>
>    #declare R=R+0.01;
>    #end
>}
>
>#declare O_Yang=
>object
>{
>    O_Ying
>    rotate y*180
>}
>
>
>Adam C.
>
>.......................
>
>Paul Vanukoff wrote:
>
>> I'm trying to create a ying/yang sort of image. Here is some source that
>> defines the objects. On paper it seems like it would work, but when
>> rendered, there is a nice gap between the two halves. I have messed
around
>> with different formulae, but can't get it right. Can anyone grok the
formula
>> for this?  :)
>>
>> // Source //
>>
>> #declare O_Ying=
>> union
>> {
>>     #declare R=0;
>>     #while (R<1)
>>     #declare A=R*180;
>>
>>         #declare X=1.5*cos(radians(A))+0.5;
>>         #declare Y=0.0;
>>         #declare Z=1.5*sin(radians(A));
>>
>>         sphere
>>         {
>>             <X,Y,Z>,R
>>         }
>>
>>     #declare R=R+0.01;
>>     #end
>> }
>>
>> #declare O_Yang=
>> object
>> {
>>     O_Ying
>>     rotate y*180
>> }
>>
>> // End Source //
>>
>> --
>> Paul Vanukoff
>> van### [at] primenetcom
>

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