private void CollectTilePolygons()
{
if (!m_Tile.m_CollisionObjects.IsEmpty())
{
foreach (var collision in m_Tile.m_CollisionObjects)
{
var tilePoly = new TilePolygon();
tilePoly.IsClosed = collision.IsClosed;
tilePoly.ColliderLayerName = collision.m_PhysicsLayer;
tilePoly.ColliderLayerId = LayerMask.NameToLayer(collision.m_PhysicsLayer);
tilePoly.IsTrigger = collision.m_IsTrigger;
var points = m_ImportContext.MakePointsPPU(collision.Points);
points = points.Select(pt => (Vector2)m_Transform.MultiplyPoint(pt)).ToArray();
// Make sure the polygon points order is still CCW. Otherwise clipper may subtract polygons from each other.
if (PolygonUtils.SumOverEdges(points) < 0)
{
points = points.Reverse().ToArray();
}
tilePoly.Points = points;
m_Polygons.Add(tilePoly);
}
}
}
private static void AddEdgeCollider(GameObject go, CollisionObject collision, SuperTile tile, SuperImportContext importContext)
{
var edge = go.AddComponent <EdgeCollider2D>();
edge.points = importContext.MakePointsPPU(collision.Points);
go.AddComponent <SuperColliderComponent>();
}
private static void AddPolygonCollider(GameObject go, CollisionObject collision, SuperTile tile, SuperImportContext importContext)
{
// Note that polygons may need to be decomposed into convex parts
var points = importContext.MakePointsPPU(collision.Points);
// Triangulate the polygon points
var triangulator = new Triangulator();
var triangles = triangulator.TriangulatePolygon(points);
// Gather triangles into a collection of convex polygons
var composition = new ComposeConvexPolygons();
var convexPolygons = composition.Compose(triangles);
PolygonUtils.AddCompositePolygonCollider(go, convexPolygons);
}