Structural config (line systems, the attractor, and the shape field)

Declarative data the generator/sampler consumes once at load — not expressions. Validated at load; a bad value is a surfaced error.

In this section

• [curve] — for parametric_curve
• [generator] — for lsystem
• [generator] — for star_pattern
• [particles] — for attractor
• tuple picks a whole figure, framing included
• [spectrum] — for spectrum
• [path] — for shape_field