Problem-- getting a surface to rotate to an attractor???

I am new to Grasshopper and Rhino so it may be an obvious problem here.... I am trying to set up a series of columns that expand and contract given a certain angle. I am hoping that i might get this angle to react to an attractor such as a sun path .. so far i have tried with just a single point as an attractor but i think i may have not defined the vectors properly. If anyone could help it would be greatly appreciated.

110427LOFT.ghx

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Comment by Kara G on April 28, 2011 at 2:59am: Thanks Danny for your help.. no i do not know Eleanor .. but i had looked at her example i must have mae a mistake when puttin in the product vector. Im new to grasshopper3d so thanksfor letting me know about the discussion v post.

Cheers again :)

Comment by Danny Boyes on April 27, 2011 at 1:33pm: Also for future reference. If you add this in the forum as a discussion I can edit my post to correct the wayward 'get' in "to get try" :)

Where as comments to blogs are static

Comment by Danny Boyes on April 27, 2011 at 1:30pm: Hi Kara,

Are you studying with Eleanor, or did you see this post? http://www.grasshopper3d.com/forum/topics/rotate-panel-with-vector?...

Instead of using the Vect2Pt component to get try and get the direction of rotation you need the Cross Product. Vector>Vector>Cross Product.

Also the point to rotate about for each panel is different so you need to add the centroid from the area component to the Plane XY input O.