"Stephen McAvoy" <McA### [at] aol com> wrote in message
news:c1j0nvccpb4or0qvk6kcm10o73j08mfikq@4ax.com...
> Does any one have ideas for a compressible spring for an animation. I've tried
a
> sphere_sweep but the rendering times are too long for me?
Hmm, well I googled for helix function
which got me http://www.ric.edu/mrodrigues/math411/TheHelix.doc
which got me
#declare fn_X = function(x,y,z) {(x-cos(3*z))*(x-cos(3*z)) + (y -
sin(2*z))*(y-sin(2*z)) - 0.5}
which is fine if you want to model a slinky after a 4yr old with tourette's has
got hold of it.... :(
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