By default the aster creates a radial distribution of fiber, and only the radius need to be specified:

new aster NAME
{
  nb_fibers = INTEGER
  radius = OUTER_RADIUS, INNER_RADIUS
  ...
}

The configuration of the Aster can also be customized by providing points on which the fibers are attached.

Syntax:

new aster NAME
{
  nb_fibers = INTEGER
  anchor0 = POINT, POINT
  anchor1 = POINT, POINT
  ...
}

Each POINT can be specified in two ways:

as a VECTOR, to specify the position of a new point,
as an #INDEX refereeing to an already defined point.

A point with index=0 is always added at the center of the Aster.

Example:

new aster centrosome
{
  nb_fibers = 3
  anchor0 = #0, 1  0 0
  anchor1 = #0, 0  1 0
  anchor2 = #0, 0 -1 0
}

It is also possible to add point to the Solid, before adding the anchors. The syntax is the same as for customizing a solid (How to create a Solid):

new aster centrosome
{
  nb_points = 3
  point0 = 0 -0.2 0, 0.2
  point1 = 0  0   0, 0.2
  point2 = 0 +0.2 0, 0.2
  nb_fibers = 3
  anchor0 = #0,  0.5 -0.2 0
  anchor1 = #1,  0.5  0   0
  anchor2 = #2,  0.5 +0.2 0
}