26 10 2008

I’m working toward producing a set of vectors for the joints between the tori. I just need to calculate where the these line segments intersect:



this approach is proving difficult to actually accomplish in code, mine or others.


23 10 2008

Our unit dodecahedron does not lineup with out unit icosahedron:

(±1, ±1, ±1)
(0, ±1/φ, ±φ)
(±1/φ, ±φ, 0)
(±φ, 0, ±1/φ)

(0, ±1, ±φ)
(±1, ±φ, 0)
(±φ, 0, ±1)

We need to scale and rotate the dodecahedron, not sure of the specifics.


23 10 2008

I think these are beautiful shapes that may make for good logos (with some framing of course!):

First Success

21 10 2008

Check this out. A truncated dodecahedral Polywell rendered in CAD.

I created this using ruby to pass draw instructions to mged (the main command line tool for BRL-CAD):

require 'matrix'
phi = (1+Math.sqrt(5))/2
icosahedron = Matrix[
[0, +1, +phi],
[0, +1, -phi],
[0, -1, +phi],
[0, -1, -phi],
[+1, +phi, 0],
[+1, -phi, 0],
[-1, +phi, 0],
[-1, -phi, 0],
[+phi, 0, +1],
[+phi, 0, -1],
[-phi, 0, +1],
[-phi, 0, -1]

icosahedron.row_vectors().each_with_index do |v,index|
`/usr/brlcad/bin/mged -f -c test3.g 'in torus#{index}.s tor #{v[0]} #{v[1]} #{v[2]} #{v[0]} #{v[1]} #{v[2]} 1.0 0.125'`

This basically iterates through the vertices of the icosahedron, and draws a torus normal to the origin. Now we are tantalizingly close to having a CAD file we can render in metal.

The Core

20 10 2008

The Polywell reactor has a core. This is the core of WB6 from EMC2:





This is what it looks like opened up:



the core exposed

the core exposed, you can see the coils of the electromagnet


So lets start by modeling the shape of the core. To make it more interesting, we’ll use the truncated dodecahedron. Supposedly the truncated dodecahedron has advantages over the truncated cube:


Truncated Dodecahedron

Truncated Dodecahedron rendered by ephi


This is a simple dodecahedron:




To find the midpoint of the dodecahedron’s planes, we can use the Icosahedron:



So now we can generate a torus at each of the vertices of the Icosahedron, orthogonal to the line connecting the vertices to the origin. But first lets take a look at some of the tool and technologies we might use.

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