nodename » morph

Googling myself with Voronoi

alan — Sat, 22 Aug 2009 05:38:39 +0000

No, this isn’t about some hot new way of using Voronoi diagrams to google myself; I’ll leave that challenge to Mario.

I was looking over the search terms that had led people to my blog today, and decided to click on “Alan Shaw” Voronoi. Among all the recent stuff, I came across some papers and articles from my pre-Flash (and pre-C++) days:

Automatic construction of polyhedral surfaces from voxel representations (1988)
Generalized map makers problem: optimal flattening of polyhedral surfaces

Applications of Computer Graphics and Image Processing to 2D and 3D Modeling of the Functional Architecture of Visual Cortex
A Numerical Solution to the Generalized Mapmaker’s Problem: Flattening Nonconvex Polyhedral Surfaces

Now to reread them after twenty years and see if they were all bullshit.

We achieved reasonable performance on a Sun-2 microprocessor system (which is roughly comparable to a VAX-750).

Uh huh.

Here’a a video by mike40033:

Marching Squares: Boundary detection

alan — Thu, 18 Jun 2009 23:30:59 +0000

A little code for a change.

Sakri was working on this, and I ported a class from Java which I believe he adapted into his final implementation. It’s a basic tool for morphing, 3D surface reconstruction, and vectorization.

I’ve cleaned up my version of it and I offer it here. The important function signature looks like this:

public static function perimeter(data:BitmapData, x:int, y:int):Vector.

It returns a list of pixels representing the boundary between opaque and transparent pixels, starting from a single boundary point that you provide.

You can get a boundary point using Sakri’s and Mario’s EdgeFinder class.

Download the source.

How it works: Marching Squares on Wikipedia

Have you seen this man?

alan — Mon, 13 Oct 2008 03:40:14 +0000

He supports an expansion of stem-cell research. He’s made nuclear nonproliferation a priority. He favors combating global warming with a “cap and trade” system. He supported a bill to expand the government’s eavesdropping authority and to protect telephone companies that cooperated with the program from being sued. He embraces the idea of continuing Bush’s faith-based initiative. He said he was picked last on a sports team as a boy. He said it taught him to work hard and persevere. His favorite childhood Halloween costume was a pirate.

Click on the image to open AstroMorpher in a new window (requires Flash Player 10).

The program uses Nicolas Barradeau’s Delaunay triangulation code.

Download the source archive, which can be imported as a project into Flex Builder 3, or just opened normally to read the code.

Work with Flash 10 in Flex Builder 3