> Are these all grid based like common for 2D DLA algorithms?  It's not 
> immediately visible from the images. 

They are not grid based but continuous. A branch is added 
when the particle comes within a certain distance from the 
existing structure. The resulting structure is rendered
with a spline sphere sweep in PovRay with sphere radius
a decreasing function of distance from the initial seed.

-- 
Paul Bourke
pdb_NOSPAMswin.edu.au

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