# GH_Extrusion class

Namespace: [Grasshopper.Kernel.Types](https://developer.rhino3d.com/api/gh1/namespace/grasshopper.kernel.types.md) · Assembly: [Grasshopper](https://developer.rhino3d.com/api/gh1/assembly/grasshopper.md)

```cs
public class GH_Extrusion : GH_GeometricGoo<Extrusion>, IGH_BakeAwareData, IGH_PreviewData, IGH_PreviewMeshData, IGH_RenderAwareData, IGH_GeometricGoo
```

Represents a 3D extrusion. GH_Extrusion wraps the functionality of the OpenNURBS OnExtrusion class.

## Constructors

- [GH_Extrusion](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/ctor.md): (4 overloads)

## Properties

- [Boundingbox](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/boundingbox.md)
- [ClippingBox](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/clippingbox.md)
- [IsGeometryLoaded](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/isgeometryloaded.md)
- [IsValid](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/isvalid.md)
- [IsValidWhyNot](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/isvalidwhynot.md): Gets a string describing the state of "invalidness". If the instance is valid, then this property should return Nothing or String.Empty.
- [ReferenceID](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/referenceid.md)
- [TypeDescription](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/typedescription.md)
- [TypeName](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/typename.md)
- [Value](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/value.md)

## Methods

- [AppendRenderGeometry](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/appendrendergeometry.md)
- [BakeGeometry](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/bakegeometry.md)
- [CastFrom](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/castfrom.md)
- [CastTo<T>](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/castto.md)
- [ClearCaches](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/clearcaches.md)
- [DestroyPreviewMeshes](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/destroypreviewmeshes.md)
- [DrawViewportMeshes](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/drawviewportmeshes.md)
- [DrawViewportWires](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/drawviewportwires.md)
- [Duplicate](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/duplicate.md)
- [DuplicateExtrusion](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/duplicateextrusion.md)
- [DuplicateGeometry](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/duplicategeometry.md)
- [EmitProxy](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/emitproxy.md)
- [GetBoundingBox](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/getboundingbox.md)
- [GetPreviewMeshes](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/getpreviewmeshes.md)
- [LoadGeometry](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/loadgeometry.md): (2 overloads) If the geometry is referenced and not yet loaded, attempts to load the geometry.
- [Morph](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/morph.md)
- [Read](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/read.md)
- [ScriptVariable](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/scriptvariable.md)
- [ToString](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/tostring.md)
- [Transform](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/transform.md)
- [Write](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-extrusion/write.md)

## Inherited Members

- From [GH_GeometricGoo<T>](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-geometricgoo-1.md): [IsReferencedGeometry](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-geometricgoo-1/isreferencedgeometry.md)
- From [GH_Goo<T>](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-goo-1.md): [m_value](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-goo-1/m-value.md), [CastTo<Q>](https://developer.rhino3d.com/api/gh1/type/grasshopper.kernel.types.gh-goo-1/castto.md)