I remember seeing a video that included taking a circle creating a NURBS Curve and then scaling it using an expression which I for the life of me can't remember? If anyone either remembers the video and/or the expression used please tell me. ops:


DJ

Do a search for “helix”.
There is probably one on the exchange, or even as an example in the help file.

Otherwise just create a line sop (give it enough points, like 100 or so), then append a point sop and in the position field:


X: sin($TY)
y: $TY
Z: cos($TY)


You can create your own custom controls to change the frequency.

X: sin($TY*360)
y: $TY
Z: cos($TY*360)


for more rings:

X: sin($TY*360*amount_of_rings)
y: $TY
Z: cos($TY*360*amount_of_rings)


Or you could link it to $PT

X: sin((($PT/$NPT)*360)*2)
y: $TY
Z: cos((($PT/$NPT)*360)*2)



But really you should do this in a vopsop as it is much faster.

Thanks pclaes that works but I also found one video that I was thinking of by davekaul on youtube: http://www.youtube.com/watch?v=pWm07oqgKbc [youtube.com]. The other video must be on Digital Tutors I will re-subscribe and look at the videos again.
DJ