[Sidefx-houdini-list] paper folding
east.robert at gmail.com
Sun Jul 31 22:10:57 EDT 2011
Thanks a lot for the reply !
On Mon, Aug 1, 2011 at 9:31 AM, Andrew Nicholas <andy at andynicholas.com>wrote:
> 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.
> 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
> > 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"
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