Method toPolygon

packages/melonjs/src/renderable/mesh.js:878–894

* Compute a 2D convex hull polygon from the current projected vertices. * Useful for creating collision shapes. * @returns {Polygon} a convex hull polygon in local coordinates

()

	 * @returns {Polygon} a convex hull polygon in local coordinates
	 */
	toPolygon() {
		// update cached points from projected vertices
		for (let i = 0; i < this.vertexCount; i++) {
			this._hullPoints[i].set(this.vertices[i * 3], this.vertices[i * 3 + 1]);
		}

		// Graham scan convex hull (sorts in place, returns a subset)
		const hull = convexHull(this._hullPoints);

		if (this._hullPolygon === null) {
			this._hullPolygon = new Polygon(0, 0, hull);
		} else {
			this._hullPolygon.setVertices(hull);
		}

		return this._hullPolygon;
	}

	/**
	 * Render the mesh at its current state (transforms, projection, tint) to an offscreen canvas.