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It's fairly simple stuff. Funnily enough I did something almost identical (also in ICE) for a Brother job. The procedure for doing this is as follows: 1) Transform all points into local space of the Controller object. 2) Get distance of transformed point from the x axis. 3) Use the distance as the angle parameter into the equation of a circle and use the height of the controller object as the radius: P = [ r sin(d), - r cos(d), z] 4) Use whatever other rotation limits and parameters you want to get the effect you're after. So mathematically speaking, you'd need to know how to transform a vector with the inverse world matrix of the controller, and also know how to use the equation of a circle. I don't have Houdini in front of me now, otherwise I'd be able to advise you more specifically how to implement this, but it shouldn't be too hard. For one thing, you can avoid doing the matrix transform manually by using the Object Merge SOP to do it for you. Cheers, Andy On 1 Aug 2011, at 00:01, robert east wrote: > Hi List, > I found this interesting video by chance on paper folding > http://www.vimeo.com/25096113 . Just out of sheer interest if I wanted to > approach this technique in Houdini what area of maths / vops should I be > looking into. > > regards > > Rob > > > -- > Robert East > > Sydney Australia > +61 (0) 299672804 > "Houdini is a pipeline in a box. Maya is a box that you have to build a > pipeline for" > _______________________________________________ > Sidefx-houdini-list mailing list > Sidefx-houdini-list at sidefx.com > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list _______________________________________________ Sidefx-houdini-list mailing list Sidefx-houdini-list at sidefx.com https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list