It's alright..I worked out what I was doing wrong.
Thanks for your help.

Andy

Andrew Cocker wrote in message <36c325d5.0@news.povray.org>...
>Obviously  I don't really understand the use of macros.. can you point out what else
I
>need to put to complete this please.
>
>#macro BeadPos( Start, End, NumBeads, BeadNum )
>    Start+(BeadNum-1)*(End - Start)/(NumBeads-1)
>#end
>
>#declare Start=<-1,1,0>;
>#declare End=<1,-1,0>;
>#declare NumBeads=25;
>#declare BeadNum=1;
>#while (BeadNum<=NumBeads)
>  sphere { BeadPos  texture {Reddy} }
>#declare BeadNum=BeadNum+1;
>#end
>
>Thanks
>
>Andy
>
>Ron Parker wrote in message <36c31b51.0@news.povray.org>...
>>On Thu, 11 Feb 1999 15:10:37 -0000, Andrew Cocker wrote:
>>>Okay, here's my problem. I'm working on an anim.
>>>Let's say I have two points in space. Joining these, I have a thin piece of elastic
 or
>>>similar stretchable material ). Threaded on this elastic are a number (
provisionally
>5 )
>>>of spheres, spaced evenly.
>>>As the two points move around, how do I get the vector of each sphere as they
remain
>>>evenly spaced along the elastic?
>>>I need the vector as each sphere will eventually become a blob component.
>>
>>This is untested, but it should be close to what you want.
>>
>>// This macro returns the center of a bead as requested
>>// inputs: Start    = position of start of strand (vector)
>>//         End      = position of end of strand (vector)
>>//         NumBeads = number of beads on strand (integer >= 2)
>>//         BeadNum  = Bead number (integer, 1 .. NumBeads)
>>
>>#macro BeadPos( Start, End, NumBeads, BeadNum )
>>    Start+(BeadNum-1)*(End - Start)/(NumBeads-1)
>>#end
>>
>
>

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