Function createConcaveBody

createConcaveBody(
vertices: GeomPoly | Vec2[],
options?: ConcaveBodyOptions,
): Body
Create a Body from concave (non-convex) polygon vertices.

Accepts arbitrary simple polygon vertices (concave or convex), performs validation, optional simplification, and convex decomposition via GeomPoly.convexDecomposition(). Each convex partition becomes a Polygon shape on the returned body.

If the input is already convex, a single Polygon shape is created (no decomposition overhead).
Parameters
- vertices: GeomPoly | Vec2[]
  Polygon vertices as Vec2[] or GeomPoly. Must form a simple (non-self-intersecting) polygon with at least 3 vertices.
- Optionaloptions: ConcaveBodyOptions
  Optional configuration (body type, material, filter, etc.)
Returns Body
A Body containing one or more convex Polygon shapes.
Throws
If vertices are null/undefined, fewer than 3, degenerate (zero area), or self-intersecting.
Example
```
// L-shaped concave polygon
const body = createConcaveBody([
  Vec2.get(0, 0), Vec2.get(100, 0), Vec2.get(100, 50),
  Vec2.get(50, 50), Vec2.get(50, 100), Vec2.get(0, 100),
]);
body.space = space;
```
- Defined in packages/nape-js/src/helpers/createConcaveBody.ts:60