# MeshDeformParameter Base class for GPU and CPU custom deform function input ``` struct MeshDeformParameter ``` ## Topics ### Accessing deformation buffers [`var inputBuffers: MeshDeformParameter.VertexBuffers`](/documentation/RealityKit/MeshDeformParameter/inputBuffers) The specified input vertex data for the deformer function. [`var outputBuffers: MeshDeformParameter.VertexBuffers`](/documentation/RealityKit/MeshDeformParameter/outputBuffers) The specified output vertex data for the deformer function. [`struct VertexBuffers`](/documentation/RealityKit/MeshDeformParameter/VertexBuffers) The vertices requested by the developer when they defined their custom deformations. These will be passed into their custom deformation functions. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)