Type Alias: Shape2D

type Shape2D = 
  | {
  kind: "circle";
  radius: number;
  x: number;
  y: number;
}
  | {
  kind: "polygon";
  points: number[];
}
  | {
  kind: "chain";
  loop: boolean;
  points: number[];
};

Body-local geometry. points is a flat x, y list; a polygon is convex with at most PHYSICS2D_MAX_POLYGON_VERTICES points.