---
title: inputSpec
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/meshdeformeroptions/inputspec
---

# inputSpec

The expected vertex buffer input spec for the deformer type.

## Declaration

```swift
let inputSpec: MeshDeformerVertexOptions
```

## Discussion

Discussion This is used to determine dependencies lower in the deformation stack that may re-trigger this deformation.

## See Also

### Specifying vertex data

- [outputSpec](realitykit/meshdeformeroptions/outputspec.md)