### Curl noise

A clever observation by Bridson and others lets us calculate the
'curl' of a noise field at each
particle in a particle system.. Create a particle system with an
omni/directional emitter, and specify

this 'runtime after
dynamics' expression.

### Crack networks from instancing a lattice template

A crack pattern on an equilateral triangle ("prototile") can be
instanced over an entire trimesh to create a seamless crack
network. Select a polymesh, then run

vorTess "test";

using

this program, to create a crackable mesh called "test". The
resulting mesh can be subjected to 'vorTess("test2")' for a second round, and
so on - the results are repeatedly recrackable.

This S2007 poster describes the idea.

### Halton (LDS) sequence

LDS sequences are "predictable but random enough"..

This program creates (x,y) points based on
the Halton sequence.

source Halton;
genGridPts 16;
genRndPts 16;
testHalton 256;

### Alternate Voronoi-like diagrams

Load

this .obj polymesh into Maya. It
is a Delaunay triangulation of a small set of points. To create a
Voronoi diagram and Voronoi-like alternatives from these triangles,
use

this program.

select -r DelaunayShape ;
source computeTriCenters;
computeTriCenters;

Edit the program, look for the calcCen() proc, and uncomment one
alternative at a time to create the variations.

// computeBarycen($fanList,$msh,.33333,.33333,.33333); // centroid, if equal wts
// computeBarycen($fanList,$msh,.55,.15,.3);
computeCircumcen($fanList,$msh);
// computeIncen($fanList,$msh);
// computeOrthocen($fanList,$msh,.0005,.001,.002); // same as circumcen, for 0 wts
// computeOrthocen($fanList,$msh,0,0,0); // same as circumcenter..
// computeTwirledCircumcen($fanList,$msh,.5);
// computeWeightedcen($fanList,$msh);

The point is that the classic Voronoi diagram is just one of many ways
of creating a cellular network from a random set of points on a plane.

Here is the S2007 poster on this idea. Also, these two animations show transitions between alternatives:

Movie1

Movie2