---
title: USDPreviewSession.OptimizationParameters.unmodified
framework: spatialpreview
role: symbol
role_heading: Case
path: spatialpreview/usdpreviewsession/optimizationparameters/unmodified
---

# USDPreviewSession.OptimizationParameters.unmodified

The USD stage is used as-is with no optimization.

## Declaration

```swift
case unmodified
```