attractor on 3D surface

Good evening to everyone,
I would like to ask about attraction on the 3D surface (double curved surface). I have 3D surface(by loft function) and I would like to make a circle perforation on this surface, the perforation should be random in the size of diametres of the circles according to the attractors, so my surface would be somewhere perforated by big circles and somewhere not perforated at all. If yomeone of you already managed this problem, please can you help me, or if someone has this GH diagram, please can you share it with me? I would be very thankful. For better understanding of my strange explanation I attach my surface. Thank you very much for any help

Attachments:

surface.jpg, 209 KB
surface.3dm, 466 KB

Replies to This Discussion

Permalink Reply by David Rutten on January 16, 2010 at 2:18am

Hi Marek,

I haven't got a ready-made example, but I've done something a bit similar in the past at workshops. Here are some of the algorithms:

Creating Random, Non-Intersecting Circles:

1) Generate a set of planes in space (if you have surface points and surface normals, you can make planes from these)
2) Use a [Proximity 3D] component to find, for every plane-origin, the one nearest other plane origin.
3) Half the distance between every point [A] and the nearest point [B] equals the maximum allowed radius for the circle at point [A].

Scaling Objects Randomly Based On Attractors:

1) Create attractor geometry and find for every point the closest attractor.
2) Measure the distance to this attractor and run it through a [GraphMapper] object so you can easily convert Distance (input) to Scaling Factor (output).
3) Once you have a scaling factor [F], create a numeric domain with [F] as the upper limit.
4) Use this domain to generate a single random value, be sure to supply a different seed value for every random value you generate, otherwise you'll get the same random value over and over again.
5) Scale the object with the randomized scaling factor.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

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