I would first like to thank Julius Klatte for posting some spiral tutorials
on his website (http://members.tripod.com/~klatte/pov/helix.html).  All
credit for the following information belongs to him.

His basic tutorial is as follows:

camera { location <0,2,-10> look_at <0,0,0> }
light_source { <-30,40,-50> rgb 1 }
light_source { <60,20,-30> rgb 1 }

#declare Tex = texture { pigment { color rgb <0.95,0.65,0.55> } finish {
phong 1 phong_size 100 } }
#declare S = sphere { 0, 0.25 texture { Tex } }

#declare Precision = 0.5;
union {
  #declare T = 0;
  #while (T<360)
    object { S translate <0,T/180,-2> rotate 4*y*T }
    #local T = T + 1/Precision;
  #end
rotate x*-20 }



Now, my question is, "Is there is any way to cause each subsequent sphere to
have a smaller or larger diameter than the one before it?"

Unfortunately, I'm only just dabbling with macro's and such and I'm not all
that good at it.  I can understand this macro only because Julius Klatte
explains it very well and "breaking it down" backwards isn't that hard for
me.  However, trying to create my own macro, even using his as a guide, is
a bit beyond me at the moment.  I appreciate any help that anyone can offer
on this, especially if it is in the form of a macro that I can copy and
paste into my POV file!  Thanks!


Take care and have a great day....



ciao,
john.

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