Working with primitives in Patterns

[Chris Dee]

The first thing that confused me is that I can't adjust the width of rings. A ring with the radius of 1 is too big, 2 ist too small.

The numeric suffix in the filename (4-4ringN) indicates the inner radius of the ring - the outer radius is always 1LDu greater. For example the 4-4ring4 primitive creates a ring with an inner radius of 4LDu and an outer radius of 5LDu. But you can scale the primitive with the matrix, so scaling 4-4ring4 by 0.25 would give a ring with an inner radius of 1LDu and an outer radius of 1.25 LDu.

The Rings and Cones utility written by Niels Karsdorp at http://www.philohome.com/isecalc/rings.htm is useful for calculating how do do this.