# PolygonGeometry > The geometry of a closed convex polygon. The geometry has a fixed maximum number of vertices as defined by the constant PhysicsConstants.MaxPolygonVertices. Polygon regions that require a larger quantity of vertices or are concave are defined by multiple polygon geometry using the PhysicsComposer or the PolygonGeometry.CreatePolygons utility. See PhysicsBody.CreateShape. ## Definition * **Type:** Struct * **Namespace:** [Unity.U2D.Physics](/engine/6000.5/script-reference/unity/u2d/physics.md) * **Assembly:** UnityEngine.PhysicsCore2DModule ```csharp public struct PolygonGeometry ``` ## Fields | Value | Description | | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | | [normals](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/normals.md) | The geometry normal stored in a [PhysicsShape.ShapeArray](/engine/6000.5/script-reference/unity/u2d/physics/physicsshape/shapearray.md). | | [vertices](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/vertices.md) | The geometry vertices stored in a [PhysicsShape.ShapeArray](/engine/6000.5/script-reference/unity/u2d/physics/physicsshape/shapearray.md). | ## Static Fields | Value | Description | | ------------------------------------------------------------------------------------------------------- | ------------------------ | | [defaultGeometry](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/defaultgeometry.md) | Get the default Polygon. | ## Constructors | Constructor | Description | | ---------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- | | [PolygonGeometry()](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/ctor.md) | Create a default Polygon. See [\_defaultGeometry](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/defaultgeometry.md). | ## Properties | Property | Description | | ----------------------------------------------------------------------------------------- | ----------------------------------------- | | [centroid](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/centroid.md) | The centroid of the polygon. | | [count](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/count.md) | The number of polygon vertices. | | [isValid](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/isvalid.md) | Check if the geometry is valid or not. | | [radius](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/radius.md) | The external radius for rounded polygons. | ## Methods | Method | Description | | ----------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [AsReadOnlySpan](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/asreadonlyspan.md) | Get the polygon vertices as a read-only span. | | [AsSpan](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/asspan.md) | Get the polygon vertices as a span. | | [CalculateAABB](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/calculateaabb.md) | Calculate the AABB of the geometry. | | [CalculateMassConfiguration](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/calculatemassconfiguration.md) | Calculate the mass configuration of the geometry. | | [CastRay](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/castray.md) | Calculate if a world ray intersects the geometry. See [PhysicsQuery.CastResult](/engine/6000.5/script-reference/unity/u2d/physics/physicsquery/castresult.md). | | [CastShape](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/castshape.md) | Calculate if a cast shape intersects the geometry. Initially touching shapes are treated as a miss. You should check for overlap first if initial overlap is required. See [PhysicsQuery.CastShapeInput](/engine/6000.5/script-reference/unity/u2d/physics/physicsquery/castshapeinput.md) and [PhysicsQuery.CastResult](/engine/6000.5/script-reference/unity/u2d/physics/physicsquery/castresult.md). | | [ClosestPoint](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/closestpoint.md) | Calculate the closest point on this geometry to the specified point. | | [CreateShapeProxy](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/createshapeproxy.md) | Create a shape proxy from the geometry. | | [Intersect](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/intersect.md) | Check the intersection between this geometry and another. | | [InverseTransform](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/inversetransform.md) | Inverse-Transform the geometry. | | [OverlapPoint](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/overlappoint.md) | Calculate if a point overlaps the geometry. | | [Transform](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/transform.md) | Transform the specified geometry. | | [Validate](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/validate.md) | Get a validated version of the geometry, if possible. | ## Static Methods | Method | Description | | --------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [Create](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/create.md) | Create a Polygon from the specified vertices. The number of vertices must be in the range 3 to [PhysicsConstants.MaxPolygonVertices](/engine/6000.5/script-reference/unity/u2d/physics/physicsconstants/maxpolygonvertices.md). | | [CreateBox](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/createbox.md) | Create a Polygon as a four-sided box. | | [CreatePolygons](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/createpolygons.md) | Create multiple [PolygonGeometry](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry.md) from a set of vertices. The vertices are assumed to produce a closed loop but can describe a concave shape if required. There must be at least 3 vertices. A limit is imposed on small vertex distances so be aware that this overload uses a vertex scale of [\_one](/engine/6000.5/script-reference/unityengine/vector2/one.md) so consider using the overload which allows you to increase this if required. | | [DeleteVertex](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/deletevertex.md) | Delete a vertex from the geometry returning a new geometry with updated normals and centroid. | | [InsertVertex](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/insertvertex.md) | Insert a vertex into the geometry returning a new geometry with updated normals and centroid. | | [InverseTransform](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/inversetransform.md) | Inverse-Transform a batch of geometry in place. A transform that degenerates the geometry hull writes an invalid (zero-vertex) polygon in its place. | | [Transform](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/transform.md) | Transform a batch of geometry in place. A transform that degenerates the geometry hull writes an invalid (zero-vertex) polygon in its place. | ## Structs | Struct | Description | | ------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------- | | [PolygonGeometry.ConvexHull](/engine/6000.5/script-reference/unity/u2d/physics/polygongeometry/convexhull.md) | A simple convex hull. The hull is not validated by physics so cannot be used directly for shapes. |