Ground colour (#rrggbb), one of farm.colors[crop].
True if the rows follow the contours (sloping ground) rather than the field's long side.
What grows here.
Index in Farm.fields.
Outline (frame-local), counter-clockwise, convex.
Unit direction the rows (furrows, tramlines) run along, [x, z].
Row spacing, metres (0 = no rows, e.g. pasture).
One field. Plain data: feed corn fields to a crop renderer by
polygon,rowsandrowSpacing.